mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-10 19:56:03 +00:00
2203 lines
66 KiB
C
2203 lines
66 KiB
C
/* tc-mep.c -- Assembler for the Toshiba Media Processor.
|
||
Copyright (C) 2001-2014 Free Software Foundation, Inc.
|
||
|
||
This file is part of GAS, the GNU Assembler.
|
||
|
||
GAS 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.
|
||
|
||
GAS 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 GAS; see the file COPYING. If not, write to
|
||
the Free Software Foundation, 51 Franklin Street, Fifth Floor,
|
||
Boston, MA 02110-1301, USA. */
|
||
|
||
#include "as.h"
|
||
#include <stdio.h>
|
||
#include "dwarf2dbg.h"
|
||
#include "subsegs.h"
|
||
#include "symcat.h"
|
||
#include "opcodes/mep-desc.h"
|
||
#include "opcodes/mep-opc.h"
|
||
#include "cgen.h"
|
||
#include "elf/common.h"
|
||
#include "elf/mep.h"
|
||
#include "libbfd.h"
|
||
#include "xregex.h"
|
||
|
||
/* Structure to hold all of the different components describing
|
||
an individual instruction. */
|
||
typedef struct
|
||
{
|
||
const CGEN_INSN * insn;
|
||
const CGEN_INSN * orig_insn;
|
||
CGEN_FIELDS fields;
|
||
#if CGEN_INT_INSN_P
|
||
CGEN_INSN_INT buffer [1];
|
||
#define INSN_VALUE(buf) (*(buf))
|
||
#else
|
||
unsigned char buffer [CGEN_MAX_INSN_SIZE];
|
||
#define INSN_VALUE(buf) (buf)
|
||
#endif
|
||
char * addr;
|
||
fragS * frag;
|
||
int num_fixups;
|
||
fixS * fixups [GAS_CGEN_MAX_FIXUPS];
|
||
int indices [MAX_OPERAND_INSTANCES];
|
||
} mep_insn;
|
||
|
||
static int mode = CORE; /* Start in core mode. */
|
||
static int pluspresent = 0;
|
||
static int allow_disabled_registers = 0;
|
||
static int library_flag = 0;
|
||
static int mep_cop = EF_MEP_COP_NONE;
|
||
|
||
/* We're going to need to store all of the instructions along with
|
||
their fixups so that we can parallelization grouping rules. */
|
||
|
||
static mep_insn saved_insns[MAX_SAVED_FIXUP_CHAINS];
|
||
static int num_insns_saved = 0;
|
||
|
||
const char comment_chars[] = "#";
|
||
const char line_comment_chars[] = ";#";
|
||
const char line_separator_chars[] = ";";
|
||
const char EXP_CHARS[] = "eE";
|
||
const char FLT_CHARS[] = "dD";
|
||
|
||
static void mep_switch_to_vliw_mode (int);
|
||
static void mep_switch_to_core_mode (int);
|
||
static void mep_s_vtext (int);
|
||
static void mep_noregerr (int);
|
||
|
||
/* The target specific pseudo-ops which we support. */
|
||
const pseudo_typeS md_pseudo_table[] =
|
||
{
|
||
{ "word", cons, 4 },
|
||
{ "vliw", mep_switch_to_vliw_mode, 0 },
|
||
{ "core", mep_switch_to_core_mode, 0 },
|
||
{ "vtext", mep_s_vtext, 0 },
|
||
{ "noregerr", mep_noregerr, 0 },
|
||
{ NULL, NULL, 0 }
|
||
};
|
||
|
||
/* Relocations against symbols are done in two
|
||
parts, with a HI relocation and a LO relocation. Each relocation
|
||
has only 16 bits of space to store an addend. This means that in
|
||
order for the linker to handle carries correctly, it must be able
|
||
to locate both the HI and the LO relocation. This means that the
|
||
relocations must appear in order in the relocation table.
|
||
|
||
In order to implement this, we keep track of each unmatched HI
|
||
relocation. We then sort them so that they immediately precede the
|
||
corresponding LO relocation. */
|
||
|
||
struct mep_hi_fixup
|
||
{
|
||
struct mep_hi_fixup * next; /* Next HI fixup. */
|
||
fixS * fixp; /* This fixup. */
|
||
segT seg; /* The section this fixup is in. */
|
||
};
|
||
|
||
/* The list of unmatched HI relocs. */
|
||
static struct mep_hi_fixup * mep_hi_fixup_list;
|
||
|
||
|
||
#define OPTION_EB (OPTION_MD_BASE + 0)
|
||
#define OPTION_EL (OPTION_MD_BASE + 1)
|
||
#define OPTION_CONFIG (OPTION_MD_BASE + 2)
|
||
#define OPTION_AVERAGE (OPTION_MD_BASE + 3)
|
||
#define OPTION_NOAVERAGE (OPTION_MD_BASE + 4)
|
||
#define OPTION_MULT (OPTION_MD_BASE + 5)
|
||
#define OPTION_NOMULT (OPTION_MD_BASE + 6)
|
||
#define OPTION_DIV (OPTION_MD_BASE + 7)
|
||
#define OPTION_NODIV (OPTION_MD_BASE + 8)
|
||
#define OPTION_BITOPS (OPTION_MD_BASE + 9)
|
||
#define OPTION_NOBITOPS (OPTION_MD_BASE + 10)
|
||
#define OPTION_LEADZ (OPTION_MD_BASE + 11)
|
||
#define OPTION_NOLEADZ (OPTION_MD_BASE + 12)
|
||
#define OPTION_ABSDIFF (OPTION_MD_BASE + 13)
|
||
#define OPTION_NOABSDIFF (OPTION_MD_BASE + 14)
|
||
#define OPTION_MINMAX (OPTION_MD_BASE + 15)
|
||
#define OPTION_NOMINMAX (OPTION_MD_BASE + 16)
|
||
#define OPTION_CLIP (OPTION_MD_BASE + 17)
|
||
#define OPTION_NOCLIP (OPTION_MD_BASE + 18)
|
||
#define OPTION_SATUR (OPTION_MD_BASE + 19)
|
||
#define OPTION_NOSATUR (OPTION_MD_BASE + 20)
|
||
#define OPTION_COP32 (OPTION_MD_BASE + 21)
|
||
#define OPTION_REPEAT (OPTION_MD_BASE + 25)
|
||
#define OPTION_NOREPEAT (OPTION_MD_BASE + 26)
|
||
#define OPTION_DEBUG (OPTION_MD_BASE + 27)
|
||
#define OPTION_NODEBUG (OPTION_MD_BASE + 28)
|
||
#define OPTION_UCI (OPTION_MD_BASE + 29)
|
||
#define OPTION_NOUCI (OPTION_MD_BASE + 30)
|
||
#define OPTION_DSP (OPTION_MD_BASE + 31)
|
||
#define OPTION_NODSP (OPTION_MD_BASE + 32)
|
||
#define OPTION_LIBRARY (OPTION_MD_BASE + 33)
|
||
|
||
struct option md_longopts[] = {
|
||
{ "EB", no_argument, NULL, OPTION_EB},
|
||
{ "EL", no_argument, NULL, OPTION_EL},
|
||
{ "mconfig", required_argument, NULL, OPTION_CONFIG},
|
||
{ "maverage", no_argument, NULL, OPTION_AVERAGE},
|
||
{ "mno-average", no_argument, NULL, OPTION_NOAVERAGE},
|
||
{ "mmult", no_argument, NULL, OPTION_MULT},
|
||
{ "mno-mult", no_argument, NULL, OPTION_NOMULT},
|
||
{ "mdiv", no_argument, NULL, OPTION_DIV},
|
||
{ "mno-div", no_argument, NULL, OPTION_NODIV},
|
||
{ "mbitops", no_argument, NULL, OPTION_BITOPS},
|
||
{ "mno-bitops", no_argument, NULL, OPTION_NOBITOPS},
|
||
{ "mleadz", no_argument, NULL, OPTION_LEADZ},
|
||
{ "mno-leadz", no_argument, NULL, OPTION_NOLEADZ},
|
||
{ "mabsdiff", no_argument, NULL, OPTION_ABSDIFF},
|
||
{ "mno-absdiff", no_argument, NULL, OPTION_NOABSDIFF},
|
||
{ "mminmax", no_argument, NULL, OPTION_MINMAX},
|
||
{ "mno-minmax", no_argument, NULL, OPTION_NOMINMAX},
|
||
{ "mclip", no_argument, NULL, OPTION_CLIP},
|
||
{ "mno-clip", no_argument, NULL, OPTION_NOCLIP},
|
||
{ "msatur", no_argument, NULL, OPTION_SATUR},
|
||
{ "mno-satur", no_argument, NULL, OPTION_NOSATUR},
|
||
{ "mcop32", no_argument, NULL, OPTION_COP32},
|
||
{ "mdebug", no_argument, NULL, OPTION_DEBUG},
|
||
{ "mno-debug", no_argument, NULL, OPTION_NODEBUG},
|
||
{ "muci", no_argument, NULL, OPTION_UCI},
|
||
{ "mno-uci", no_argument, NULL, OPTION_NOUCI},
|
||
{ "mdsp", no_argument, NULL, OPTION_DSP},
|
||
{ "mno-dsp", no_argument, NULL, OPTION_NODSP},
|
||
{ "mlibrary", no_argument, NULL, OPTION_LIBRARY},
|
||
{ NULL, 0, NULL, 0 } };
|
||
size_t md_longopts_size = sizeof (md_longopts);
|
||
|
||
/* Options which default to on/off together. See the comment where
|
||
this is used for details. Note that CP and CP64 are not in this
|
||
list because disabling those overrides the -mivc2 option. */
|
||
#define OPTION_MASK \
|
||
( (1 << CGEN_INSN_OPTIONAL_BIT_INSN) \
|
||
| (1 << CGEN_INSN_OPTIONAL_MUL_INSN) \
|
||
| (1 << CGEN_INSN_OPTIONAL_DIV_INSN) \
|
||
| (1 << CGEN_INSN_OPTIONAL_DEBUG_INSN) \
|
||
| (1 << CGEN_INSN_OPTIONAL_LDZ_INSN) \
|
||
| (1 << CGEN_INSN_OPTIONAL_ABS_INSN) \
|
||
| (1 << CGEN_INSN_OPTIONAL_AVE_INSN) \
|
||
| (1 << CGEN_INSN_OPTIONAL_MINMAX_INSN) \
|
||
| (1 << CGEN_INSN_OPTIONAL_CLIP_INSN) \
|
||
| (1 << CGEN_INSN_OPTIONAL_SAT_INSN) \
|
||
| (1 << CGEN_INSN_OPTIONAL_UCI_INSN) \
|
||
| (1 << CGEN_INSN_OPTIONAL_DSP_INSN) )
|
||
|
||
const char * md_shortopts = "";
|
||
static int optbits = 0;
|
||
static int optbitset = 0;
|
||
|
||
int
|
||
md_parse_option (int c, char *arg ATTRIBUTE_UNUSED)
|
||
{
|
||
int i, idx;
|
||
switch (c)
|
||
{
|
||
case OPTION_EB:
|
||
target_big_endian = 1;
|
||
break;
|
||
case OPTION_EL:
|
||
target_big_endian = 0;
|
||
break;
|
||
case OPTION_CONFIG:
|
||
idx = 0;
|
||
for (i=1; mep_config_map[i].name; i++)
|
||
if (strcmp (mep_config_map[i].name, arg) == 0)
|
||
{
|
||
idx = i;
|
||
break;
|
||
}
|
||
if (!idx)
|
||
{
|
||
fprintf (stderr, "Error: unknown configuration %s\n", arg);
|
||
return 0;
|
||
}
|
||
mep_config_index = idx;
|
||
target_big_endian = mep_config_map[idx].big_endian;
|
||
break;
|
||
case OPTION_AVERAGE:
|
||
optbits |= 1 << CGEN_INSN_OPTIONAL_AVE_INSN;
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_AVE_INSN;
|
||
break;
|
||
case OPTION_NOAVERAGE:
|
||
optbits &= ~(1 << CGEN_INSN_OPTIONAL_AVE_INSN);
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_AVE_INSN;
|
||
break;
|
||
case OPTION_MULT:
|
||
optbits |= 1 << CGEN_INSN_OPTIONAL_MUL_INSN;
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_MUL_INSN;
|
||
break;
|
||
case OPTION_NOMULT:
|
||
optbits &= ~(1 << CGEN_INSN_OPTIONAL_MUL_INSN);
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_MUL_INSN;
|
||
break;
|
||
case OPTION_DIV:
|
||
optbits |= 1 << CGEN_INSN_OPTIONAL_DIV_INSN;
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_DIV_INSN;
|
||
break;
|
||
case OPTION_NODIV:
|
||
optbits &= ~(1 << CGEN_INSN_OPTIONAL_DIV_INSN);
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_DIV_INSN;
|
||
break;
|
||
case OPTION_BITOPS:
|
||
optbits |= 1 << CGEN_INSN_OPTIONAL_BIT_INSN;
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_BIT_INSN;
|
||
break;
|
||
case OPTION_NOBITOPS:
|
||
optbits &= ~(1 << CGEN_INSN_OPTIONAL_BIT_INSN);
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_BIT_INSN;
|
||
break;
|
||
case OPTION_LEADZ:
|
||
optbits |= 1 << CGEN_INSN_OPTIONAL_LDZ_INSN;
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_LDZ_INSN;
|
||
break;
|
||
case OPTION_NOLEADZ:
|
||
optbits &= ~(1 << CGEN_INSN_OPTIONAL_LDZ_INSN);
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_LDZ_INSN;
|
||
break;
|
||
case OPTION_ABSDIFF:
|
||
optbits |= 1 << CGEN_INSN_OPTIONAL_ABS_INSN;
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_ABS_INSN;
|
||
break;
|
||
case OPTION_NOABSDIFF:
|
||
optbits &= ~(1 << CGEN_INSN_OPTIONAL_ABS_INSN);
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_ABS_INSN;
|
||
break;
|
||
case OPTION_MINMAX:
|
||
optbits |= 1 << CGEN_INSN_OPTIONAL_MINMAX_INSN;
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_MINMAX_INSN;
|
||
break;
|
||
case OPTION_NOMINMAX:
|
||
optbits &= ~(1 << CGEN_INSN_OPTIONAL_MINMAX_INSN);
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_MINMAX_INSN;
|
||
break;
|
||
case OPTION_CLIP:
|
||
optbits |= 1 << CGEN_INSN_OPTIONAL_CLIP_INSN;
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_CLIP_INSN;
|
||
break;
|
||
case OPTION_NOCLIP:
|
||
optbits &= ~(1 << CGEN_INSN_OPTIONAL_CLIP_INSN);
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_CLIP_INSN;
|
||
break;
|
||
case OPTION_SATUR:
|
||
optbits |= 1 << CGEN_INSN_OPTIONAL_SAT_INSN;
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_SAT_INSN;
|
||
break;
|
||
case OPTION_NOSATUR:
|
||
optbits &= ~(1 << CGEN_INSN_OPTIONAL_SAT_INSN);
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_SAT_INSN;
|
||
break;
|
||
case OPTION_COP32:
|
||
optbits |= 1 << CGEN_INSN_OPTIONAL_CP_INSN;
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_CP_INSN;
|
||
break;
|
||
case OPTION_DEBUG:
|
||
optbits |= 1 << CGEN_INSN_OPTIONAL_DEBUG_INSN;
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_DEBUG_INSN;
|
||
break;
|
||
case OPTION_NODEBUG:
|
||
optbits &= ~(1 << CGEN_INSN_OPTIONAL_DEBUG_INSN);
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_DEBUG_INSN;
|
||
break;
|
||
case OPTION_UCI:
|
||
optbits |= 1 << CGEN_INSN_OPTIONAL_UCI_INSN;
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_UCI_INSN;
|
||
break;
|
||
case OPTION_NOUCI:
|
||
optbits &= ~(1 << CGEN_INSN_OPTIONAL_UCI_INSN);
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_UCI_INSN;
|
||
break;
|
||
case OPTION_DSP:
|
||
optbits |= 1 << CGEN_INSN_OPTIONAL_DSP_INSN;
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_DSP_INSN;
|
||
break;
|
||
case OPTION_NODSP:
|
||
optbits &= ~(1 << CGEN_INSN_OPTIONAL_DSP_INSN);
|
||
optbitset |= 1 << CGEN_INSN_OPTIONAL_DSP_INSN;
|
||
break;
|
||
case OPTION_LIBRARY:
|
||
library_flag = EF_MEP_LIBRARY;
|
||
break;
|
||
case OPTION_REPEAT:
|
||
case OPTION_NOREPEAT:
|
||
break;
|
||
default:
|
||
return 0;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
void
|
||
md_show_usage (FILE *stream)
|
||
{
|
||
fprintf (stream, _("MeP specific command line options:\n\
|
||
-EB assemble for a big endian system\n\
|
||
-EL assemble for a little endian system (default)\n\
|
||
-mconfig=<name> specify a chip configuration to use\n\
|
||
-maverage -mno-average -mmult -mno-mult -mdiv -mno-div\n\
|
||
-mbitops -mno-bitops -mleadz -mno-leadz -mabsdiff -mno-absdiff\n\
|
||
-mminmax -mno-minmax -mclip -mno-clip -msatur -mno-satur -mcop32\n\
|
||
enable/disable the given opcodes\n\
|
||
\n\
|
||
If -mconfig is given, the other -m options modify it. Otherwise,\n\
|
||
if no -m options are given, all core opcodes are enabled;\n\
|
||
if any enabling -m options are given, only those are enabled;\n\
|
||
if only disabling -m options are given, only those are disabled.\n\
|
||
"));
|
||
if (mep_config_map[1].name)
|
||
{
|
||
int i;
|
||
fprintf (stream, " -mconfig=STR specify the configuration to use\n");
|
||
fprintf (stream, " Configurations:");
|
||
for (i=0; mep_config_map[i].name; i++)
|
||
fprintf (stream, " %s", mep_config_map[i].name);
|
||
fprintf (stream, "\n");
|
||
}
|
||
}
|
||
|
||
|
||
|
||
static void
|
||
mep_check_for_disabled_registers (mep_insn *insn)
|
||
{
|
||
static int initted = 0;
|
||
static int has_mul_div = 0;
|
||
static int has_cop = 0;
|
||
static int has_debug = 0;
|
||
unsigned int b, r;
|
||
|
||
if (allow_disabled_registers)
|
||
return;
|
||
|
||
#if !CGEN_INT_INSN_P
|
||
if (target_big_endian)
|
||
b = insn->buffer[0] * 256 + insn->buffer[1];
|
||
else
|
||
b = insn->buffer[1] * 256 + insn->buffer[0];
|
||
#else
|
||
b = insn->buffer[0];
|
||
#endif
|
||
|
||
if ((b & 0xfffff00e) == 0x7008 /* stc */
|
||
|| (b & 0xfffff00e) == 0x700a /* ldc */)
|
||
{
|
||
if (!initted)
|
||
{
|
||
initted = 1;
|
||
if ((MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_MUL_INSN))
|
||
|| (MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_DIV_INSN)))
|
||
has_mul_div = 1;
|
||
if (MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_DEBUG_INSN))
|
||
has_debug = 1;
|
||
if (MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_CP_INSN))
|
||
has_cop = 1;
|
||
}
|
||
|
||
r = ((b & 0x00f0) >> 4) | ((b & 0x0001) << 4);
|
||
switch (r)
|
||
{
|
||
case 7: /* $hi */
|
||
case 8: /* $lo */
|
||
if (!has_mul_div)
|
||
as_bad (_("$hi and $lo are disabled when MUL and DIV are off"));
|
||
break;
|
||
case 12: /* $mb0 */
|
||
case 13: /* $me0 */
|
||
case 14: /* $mb1 */
|
||
case 15: /* $me1 */
|
||
if (!has_cop)
|
||
as_bad (_("$mb0, $me0, $mb1, and $me1 are disabled when COP is off"));
|
||
break;
|
||
case 24: /* $dbg */
|
||
case 25: /* $depc */
|
||
if (!has_debug)
|
||
as_bad (_("$dbg and $depc are disabled when DEBUG is off"));
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
static int
|
||
mep_machine (void)
|
||
{
|
||
switch (MEP_CPU & EF_MEP_CPU_MASK)
|
||
{
|
||
default: break;
|
||
case EF_MEP_CPU_C2: return bfd_mach_mep;
|
||
case EF_MEP_CPU_C3: return bfd_mach_mep;
|
||
case EF_MEP_CPU_C4: return bfd_mach_mep;
|
||
case EF_MEP_CPU_C5: return bfd_mach_mep_c5;
|
||
case EF_MEP_CPU_H1: return bfd_mach_mep_h1;
|
||
}
|
||
|
||
return bfd_mach_mep;
|
||
}
|
||
|
||
/* The MeP version of the cgen parse_operand function. The only difference
|
||
from the standard version is that we want to avoid treating '$foo' and
|
||
'($foo...)' as references to a symbol called '$foo'. The chances are
|
||
that '$foo' is really a misspelt register. */
|
||
|
||
static const char *
|
||
mep_parse_operand (CGEN_CPU_DESC cd, enum cgen_parse_operand_type want,
|
||
const char **strP, int opindex, int opinfo,
|
||
enum cgen_parse_operand_result *resultP, bfd_vma *valueP)
|
||
{
|
||
if (want == CGEN_PARSE_OPERAND_INTEGER || want == CGEN_PARSE_OPERAND_ADDRESS)
|
||
{
|
||
const char *next;
|
||
|
||
next = *strP;
|
||
while (*next == '(')
|
||
next++;
|
||
if (*next == '$')
|
||
return "Not a valid literal";
|
||
}
|
||
return gas_cgen_parse_operand (cd, want, strP, opindex, opinfo,
|
||
resultP, valueP);
|
||
}
|
||
|
||
void
|
||
md_begin ()
|
||
{
|
||
/* Initialize the `cgen' interface. */
|
||
|
||
/* If the user specifies no options, we default to allowing
|
||
everything. If the user specifies any enabling options, we
|
||
default to allowing only what is specified. If the user
|
||
specifies only disabling options, we only disable what is
|
||
specified. If the user specifies options and a config, the
|
||
options modify the config. */
|
||
if (optbits && mep_config_index == 0)
|
||
{
|
||
MEP_OMASK &= ~OPTION_MASK;
|
||
MEP_OMASK |= optbits;
|
||
}
|
||
else
|
||
MEP_OMASK = (MEP_OMASK & ~optbitset) | optbits;
|
||
|
||
mep_cop = mep_config_map[mep_config_index].cpu_flag & EF_MEP_COP_MASK;
|
||
|
||
/* Set the machine number and endian. */
|
||
gas_cgen_cpu_desc = mep_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0U,
|
||
CGEN_CPU_OPEN_ENDIAN,
|
||
target_big_endian
|
||
? CGEN_ENDIAN_BIG
|
||
: CGEN_ENDIAN_LITTLE,
|
||
CGEN_CPU_OPEN_ISAS, (CGEN_BITSET *) 0,
|
||
CGEN_CPU_OPEN_END);
|
||
mep_cgen_init_asm (gas_cgen_cpu_desc);
|
||
|
||
/* This is a callback from cgen to gas to parse operands. */
|
||
cgen_set_parse_operand_fn (gas_cgen_cpu_desc, mep_parse_operand);
|
||
|
||
/* Identify the architecture. */
|
||
bfd_default_set_arch_mach (stdoutput, bfd_arch_mep, mep_machine ());
|
||
|
||
/* Store the configuration number and core. */
|
||
bfd_set_private_flags (stdoutput, MEP_CPU | MEP_CONFIG | library_flag);
|
||
|
||
/* Initialize the array we'll be using to store fixups. */
|
||
gas_cgen_initialize_saved_fixups_array();
|
||
}
|
||
|
||
/* Variant of mep_cgen_assemble_insn. Assemble insn STR of cpu CD as a
|
||
coprocessor instruction, if possible, into FIELDS, BUF, and INSN. */
|
||
|
||
static const CGEN_INSN *
|
||
mep_cgen_assemble_cop_insn (CGEN_CPU_DESC cd,
|
||
const char *str,
|
||
CGEN_FIELDS *fields,
|
||
CGEN_INSN_BYTES_PTR buf,
|
||
const struct cgen_insn *pinsn)
|
||
{
|
||
const char *start;
|
||
CGEN_INSN_LIST *ilist;
|
||
const char *errmsg = NULL;
|
||
|
||
/* The instructions are stored in hashed lists. */
|
||
ilist = CGEN_ASM_LOOKUP_INSN (gas_cgen_cpu_desc,
|
||
CGEN_INSN_MNEMONIC (pinsn));
|
||
|
||
start = str;
|
||
for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
|
||
{
|
||
const CGEN_INSN *insn = ilist->insn;
|
||
if (strcmp (CGEN_INSN_MNEMONIC (ilist->insn),
|
||
CGEN_INSN_MNEMONIC (pinsn)) == 0
|
||
&& MEP_INSN_COP_P (ilist->insn)
|
||
&& mep_cgen_insn_supported (cd, insn))
|
||
{
|
||
str = start;
|
||
|
||
/* skip this insn if str doesn't look right lexically */
|
||
if (CGEN_INSN_RX (insn) != NULL &&
|
||
regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
|
||
continue;
|
||
|
||
/* Allow parse/insert handlers to obtain length of insn. */
|
||
CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
|
||
|
||
errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
|
||
if (errmsg != NULL)
|
||
continue;
|
||
|
||
errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
|
||
(bfd_vma) 0);
|
||
if (errmsg != NULL)
|
||
continue;
|
||
|
||
return insn;
|
||
}
|
||
}
|
||
return pinsn;
|
||
}
|
||
|
||
static void
|
||
mep_save_insn (mep_insn insn)
|
||
{
|
||
/* Consider change MAX_SAVED_FIXUP_CHAINS to MAX_PARALLEL_INSNS. */
|
||
if (num_insns_saved < 0 || num_insns_saved >= MAX_SAVED_FIXUP_CHAINS)
|
||
{
|
||
as_fatal("index into saved_insns[] out of bounds.");
|
||
return;
|
||
}
|
||
saved_insns[num_insns_saved] = insn;
|
||
gas_cgen_save_fixups(num_insns_saved);
|
||
num_insns_saved++;
|
||
}
|
||
|
||
static void
|
||
mep_check_parallel32_scheduling (void)
|
||
{
|
||
int insn0iscopro, insn1iscopro, insn0length, insn1length;
|
||
|
||
/* More than two instructions means that either someone is referring to
|
||
an internally parallel core or an internally parallel coprocessor,
|
||
neither of which are supported at this time. */
|
||
if ( num_insns_saved > 2 )
|
||
as_fatal("Internally paralled cores and coprocessors not supported.");
|
||
|
||
/* If there are no insns saved, that's ok. Just return. This will
|
||
happen when mep_process_saved_insns is called when the end of the
|
||
source file is reached and there are no insns left to be processed. */
|
||
if (num_insns_saved == 0)
|
||
return;
|
||
|
||
/* Check some of the attributes of the first insn. */
|
||
insn0iscopro = MEP_INSN_COP_P (saved_insns[0].insn);
|
||
insn0length = CGEN_FIELDS_BITSIZE (& saved_insns[0].fields);
|
||
|
||
if (num_insns_saved == 2)
|
||
{
|
||
/* Check some of the attributes of the first insn. */
|
||
insn1iscopro = MEP_INSN_COP_P (saved_insns[1].insn);
|
||
insn1length = CGEN_FIELDS_BITSIZE (& saved_insns[1].fields);
|
||
|
||
if ((insn0iscopro && !insn1iscopro)
|
||
|| (insn1iscopro && !insn0iscopro))
|
||
{
|
||
/* We have one core and one copro insn. If their sizes
|
||
add up to 32, then the combination is valid. */
|
||
if (insn0length + insn1length == 32)
|
||
return;
|
||
else
|
||
as_bad (_("core and copro insn lengths must total 32 bits."));
|
||
}
|
||
else
|
||
as_bad (_("vliw group must consist of 1 core and 1 copro insn."));
|
||
}
|
||
else
|
||
{
|
||
/* If we arrive here, we have one saved instruction. There are a
|
||
number of possible cases:
|
||
|
||
1. The instruction is a 32 bit core or coprocessor insn and
|
||
can be executed by itself. Valid.
|
||
|
||
2. The instrucion is a core instruction for which a cop nop
|
||
exists. In this case, insert the cop nop into the saved
|
||
insn array after the core insn and return. Valid.
|
||
|
||
3. The instruction is a coprocessor insn for which a core nop
|
||
exists. In this case, move the coprocessor insn to the
|
||
second element of the array and put the nop in the first
|
||
element then return. Valid.
|
||
|
||
4. The instruction is a core or coprocessor instruction for
|
||
which there is no matching coprocessor or core nop to use
|
||
to form a valid vliw insn combination. In this case, we
|
||
we have to abort. */
|
||
|
||
if (insn0length > 32)
|
||
as_fatal ("Cannot use 48- or 64-bit insns with a 32 bit datapath.");
|
||
|
||
if (insn0length == 32)
|
||
return;
|
||
|
||
/* Insn is smaller than datapath. If there are no matching
|
||
nops for this insn, then terminate assembly. */
|
||
if (CGEN_INSN_ATTR_VALUE (saved_insns[0].insn,
|
||
CGEN_INSN_VLIW32_NO_MATCHING_NOP))
|
||
as_fatal ("No valid nop.");
|
||
|
||
/* At this point we know that we have a single 16-bit insn that has
|
||
a matching nop. We have to assemble it and put it into the saved
|
||
insn and fixup chain arrays. */
|
||
|
||
if (insn0iscopro)
|
||
{
|
||
char *errmsg;
|
||
mep_insn insn;
|
||
|
||
/* Move the insn and it's fixups to the second element of the
|
||
saved insns arrary and insert a 16 bit core nope into the
|
||
first element. */
|
||
insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "nop",
|
||
&insn.fields, insn.buffer,
|
||
&errmsg);
|
||
if (!insn.insn)
|
||
{
|
||
as_bad ("%s", errmsg);
|
||
return;
|
||
}
|
||
|
||
/* Move the insn in element 0 to element 1 and insert the
|
||
nop into element 0. Move the fixups in element 0 to
|
||
element 1 and save the current fixups to element 0.
|
||
Really there aren't any fixups at this point because we're
|
||
inserting a nop but we might as well be general so that
|
||
if there's ever a need to insert a general insn, we'll
|
||
have an example. */
|
||
saved_insns[1] = saved_insns[0];
|
||
saved_insns[0] = insn;
|
||
num_insns_saved++;
|
||
gas_cgen_swap_fixups (0);
|
||
gas_cgen_save_fixups (1);
|
||
}
|
||
else
|
||
{
|
||
char * errmsg;
|
||
mep_insn insn;
|
||
int insn_num = saved_insns[0].insn->base->num;
|
||
|
||
/* Use 32 bit branches and skip the nop. */
|
||
if (insn_num == MEP_INSN_BSR12
|
||
|| insn_num == MEP_INSN_BEQZ
|
||
|| insn_num == MEP_INSN_BNEZ)
|
||
return;
|
||
|
||
/* Insert a 16-bit coprocessor nop. Note that at the time */
|
||
/* this was done, no 16-bit coprocessor nop was defined. */
|
||
insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop16",
|
||
&insn.fields, insn.buffer,
|
||
&errmsg);
|
||
if (!insn.insn)
|
||
{
|
||
as_bad ("%s", errmsg);
|
||
return;
|
||
}
|
||
|
||
/* Now put the insn and fixups into the arrays. */
|
||
mep_save_insn (insn);
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
mep_check_parallel64_scheduling (void)
|
||
{
|
||
int insn0iscopro, insn1iscopro, insn0length, insn1length;
|
||
|
||
/* More than two instructions means that someone is referring to an
|
||
internally parallel core or an internally parallel coprocessor. */
|
||
/* These are not currently supported. */
|
||
if (num_insns_saved > 2)
|
||
as_fatal ("Internally parallel cores of coprocessors not supported.");
|
||
|
||
/* If there are no insns saved, that's ok. Just return. This will
|
||
happen when mep_process_saved_insns is called when the end of the
|
||
source file is reached and there are no insns left to be processed. */
|
||
if (num_insns_saved == 0)
|
||
return;
|
||
|
||
/* Check some of the attributes of the first insn. */
|
||
insn0iscopro = MEP_INSN_COP_P (saved_insns[0].insn);
|
||
insn0length = CGEN_FIELDS_BITSIZE (& saved_insns[0].fields);
|
||
|
||
if (num_insns_saved == 2)
|
||
{
|
||
/* Check some of the attributes of the first insn. */
|
||
insn1iscopro = MEP_INSN_COP_P (saved_insns[1].insn);
|
||
insn1length = CGEN_FIELDS_BITSIZE (& saved_insns[1].fields);
|
||
|
||
if ((insn0iscopro && !insn1iscopro)
|
||
|| (insn1iscopro && !insn0iscopro))
|
||
{
|
||
/* We have one core and one copro insn. If their sizes
|
||
add up to 64, then the combination is valid. */
|
||
if (insn0length + insn1length == 64)
|
||
return;
|
||
else
|
||
as_bad (_("core and copro insn lengths must total 64 bits."));
|
||
}
|
||
else
|
||
as_bad (_("vliw group must consist of 1 core and 1 copro insn."));
|
||
}
|
||
else
|
||
{
|
||
/* If we arrive here, we have one saved instruction. There are a
|
||
number of possible cases:
|
||
|
||
1. The instruction is a 64 bit coprocessor insn and can be
|
||
executed by itself. Valid.
|
||
|
||
2. The instrucion is a core instruction for which a cop nop
|
||
exists. In this case, insert the cop nop into the saved
|
||
insn array after the core insn and return. Valid.
|
||
|
||
3. The instruction is a coprocessor insn for which a core nop
|
||
exists. In this case, move the coprocessor insn to the
|
||
second element of the array and put the nop in the first
|
||
element then return. Valid.
|
||
|
||
4. The instruction is a core or coprocessor instruction for
|
||
which there is no matching coprocessor or core nop to use
|
||
to form a valid vliw insn combination. In this case, we
|
||
we have to abort. */
|
||
|
||
/* If the insn is 64 bits long, it can run alone. The size check
|
||
is done indepependantly of whether the insn is core or copro
|
||
in case 64 bit coprocessor insns are added later. */
|
||
if (insn0length == 64)
|
||
return;
|
||
|
||
/* Insn is smaller than datapath. If there are no matching
|
||
nops for this insn, then terminate assembly. */
|
||
if (CGEN_INSN_ATTR_VALUE (saved_insns[0].insn,
|
||
CGEN_INSN_VLIW64_NO_MATCHING_NOP))
|
||
as_fatal ("No valid nop.");
|
||
|
||
if (insn0iscopro)
|
||
{
|
||
char *errmsg;
|
||
mep_insn insn;
|
||
|
||
/* Initialize the insn buffer. */
|
||
memset (insn.buffer, 0, sizeof(insn.buffer));
|
||
|
||
/* We have a coprocessor insn. At this point in time there
|
||
are is 32-bit core nop. There is only a 16-bit core
|
||
nop. The idea is to allow for a relatively arbitrary
|
||
coprocessor to be specified. We aren't looking at
|
||
trying to cover future changes in the core at this time
|
||
since it is assumed that the core will remain fairly
|
||
static. If there ever are 32 or 48 bit core nops added,
|
||
they will require entries below. */
|
||
|
||
if (insn0length == 48)
|
||
{
|
||
/* Move the insn and fixups to the second element of the
|
||
arrays then assemble and insert a 16 bit core nop. */
|
||
insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "nop",
|
||
& insn.fields, insn.buffer,
|
||
& errmsg);
|
||
}
|
||
else
|
||
{
|
||
/* If this is reached, then we have a single coprocessor
|
||
insn that is not 48 bits long, but for which the assembler
|
||
thinks there is a matching core nop. If a 32-bit core
|
||
nop has been added, then make the necessary changes and
|
||
handle its assembly and insertion here. Otherwise,
|
||
go figure out why either:
|
||
|
||
1. The assembler thinks that there is a 32-bit core nop
|
||
to match a 32-bit coprocessor insn, or
|
||
2. The assembler thinks that there is a 48-bit core nop
|
||
to match a 16-bit coprocessor insn. */
|
||
|
||
as_fatal ("Assembler expects a non-existent core nop.");
|
||
}
|
||
|
||
if (!insn.insn)
|
||
{
|
||
as_bad ("%s", errmsg);
|
||
return;
|
||
}
|
||
|
||
/* Move the insn in element 0 to element 1 and insert the
|
||
nop into element 0. Move the fixups in element 0 to
|
||
element 1 and save the current fixups to element 0.
|
||
Really there aren't any fixups at this point because we're
|
||
inserting a nop but we might as well be general so that
|
||
if there's ever a need to insert a general insn, we'll
|
||
have an example. */
|
||
|
||
saved_insns[1] = saved_insns[0];
|
||
saved_insns[0] = insn;
|
||
num_insns_saved++;
|
||
gas_cgen_swap_fixups(0);
|
||
gas_cgen_save_fixups(1);
|
||
|
||
}
|
||
else
|
||
{
|
||
char * errmsg;
|
||
mep_insn insn;
|
||
|
||
/* Initialize the insn buffer */
|
||
memset (insn.buffer, 0, sizeof(insn.buffer));
|
||
|
||
/* We have a core insn. We have to handle all possible nop
|
||
lengths. If a coprocessor doesn't have a nop of a certain
|
||
length but there exists core insns that when combined with
|
||
a nop of that length would fill the datapath, those core
|
||
insns will be flagged with the VLIW_NO_CORRESPONDING_NOP
|
||
attribute. That will ensure that when used in a way that
|
||
requires a nop to be inserted, assembly will terminate
|
||
before reaching this section of code. This guarantees
|
||
that cases below which would result in the attempted
|
||
insertion of nop that doesn't exist will never be entered. */
|
||
if (insn0length == 16)
|
||
{
|
||
/* Insert 48 bit coprocessor nop. */
|
||
/* Assemble it and put it into the arrays. */
|
||
insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop48",
|
||
&insn.fields, insn.buffer,
|
||
&errmsg);
|
||
}
|
||
else if (insn0length == 32)
|
||
{
|
||
/* Insert 32 bit coprocessor nop. */
|
||
insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop32",
|
||
&insn.fields, insn.buffer,
|
||
&errmsg);
|
||
}
|
||
else if (insn0length == 48)
|
||
{
|
||
/* Insert 16 bit coprocessor nop. */
|
||
insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop16",
|
||
&insn.fields, insn.buffer,
|
||
&errmsg);
|
||
}
|
||
else
|
||
/* Core insn has an invalid length. Something has gone wrong. */
|
||
as_fatal ("Core insn has invalid length! Something is wrong!");
|
||
|
||
if (!insn.insn)
|
||
{
|
||
as_bad ("%s", errmsg);
|
||
return;
|
||
}
|
||
|
||
/* Now put the insn and fixups into the arrays. */
|
||
mep_save_insn (insn);
|
||
}
|
||
}
|
||
}
|
||
|
||
#ifdef MEP_IVC2_SUPPORTED
|
||
|
||
/* IVC2 packing is different than other VLIW coprocessors. Many of
|
||
the COP insns can be placed in any of three different types of
|
||
slots, and each bundle can hold up to three insns - zero or one
|
||
core insns and one or two IVC2 insns. The insns in CGEN are tagged
|
||
with which slots they're allowed in, and we have to decide based on
|
||
that whether or not the user had given us a possible bundling. */
|
||
|
||
static int
|
||
slot_ok (int idx, int slot)
|
||
{
|
||
const CGEN_INSN *insn = saved_insns[idx].insn;
|
||
return CGEN_ATTR_CGEN_INSN_SLOTS_VALUE (CGEN_INSN_ATTRS (insn)) & (1 << slot);
|
||
}
|
||
|
||
static void
|
||
mep_check_ivc2_scheduling (void)
|
||
{
|
||
/* VLIW modes:
|
||
|
||
V1 [-----core-----][--------p0s-------][------------p1------------]
|
||
V2 [-------------core-------------]xxxx[------------p1------------]
|
||
V3 1111[--p0--]0111[--------p0--------][------------p1------------]
|
||
*/
|
||
|
||
int slots[5]; /* Indexed off the SLOTS_ATTR enum. */
|
||
int corelength, realcorelength;
|
||
int i;
|
||
bfd_byte temp[4];
|
||
bfd_byte *f;
|
||
int e = target_big_endian ? 0 : 1;
|
||
|
||
/* If there are no insns saved, that's ok. Just return. This will
|
||
happen when mep_process_saved_insns is called when the end of the
|
||
source file is reached and there are no insns left to be processed. */
|
||
if (num_insns_saved == 0)
|
||
return;
|
||
|
||
for (i=0; i<5; i++)
|
||
slots[i] = -1;
|
||
|
||
if (slot_ok (0, SLOTS_CORE))
|
||
{
|
||
slots[SLOTS_CORE] = 0;
|
||
realcorelength = corelength = CGEN_FIELDS_BITSIZE (& saved_insns[0].fields);
|
||
|
||
/* If we encounter one of these, it may get relaxed later into a
|
||
longer instruction. We can't just push the other opcodes
|
||
away, the bigger insn has to fit into the existing slot. So,
|
||
we make room for the relaxed instruction here. */
|
||
|
||
if (saved_insns[0].insn->base->num == MEP_INSN_BSR12
|
||
|| saved_insns[0].insn->base->num == MEP_INSN_BRA)
|
||
corelength = 32;
|
||
}
|
||
else
|
||
realcorelength = corelength = 0;
|
||
|
||
if (corelength == 16)
|
||
{
|
||
/* V1 mode: we need a P0S slot and a P1 slot. */
|
||
switch (num_insns_saved)
|
||
{
|
||
case 1:
|
||
/* No other insns, fill with NOPs. */
|
||
break;
|
||
|
||
case 2:
|
||
if (slot_ok (1, SLOTS_P1))
|
||
slots[SLOTS_P1] = 1;
|
||
else if (slot_ok (1, SLOTS_P0S))
|
||
slots[SLOTS_P0S] = 1;
|
||
else
|
||
as_bad (_("cannot pack %s with a 16-bit insn"),
|
||
CGEN_INSN_NAME (saved_insns[1].insn));
|
||
break;
|
||
|
||
case 3:
|
||
if (slot_ok (1, SLOTS_P0S)
|
||
&& slot_ok (2, SLOTS_P1))
|
||
{
|
||
slots[SLOTS_P0S] = 1;
|
||
slots[SLOTS_P1] = 2;
|
||
}
|
||
else if (slot_ok (1, SLOTS_P1)
|
||
&& slot_ok (2, SLOTS_P0S))
|
||
{
|
||
slots[SLOTS_P1] = 1;
|
||
slots[SLOTS_P0S] = 2;
|
||
}
|
||
else
|
||
as_bad (_("cannot pack %s and %s together with a 16-bit insn"),
|
||
CGEN_INSN_NAME (saved_insns[1].insn),
|
||
CGEN_INSN_NAME (saved_insns[2].insn));
|
||
break;
|
||
|
||
default:
|
||
as_bad (_("too many IVC2 insns to pack with a 16-bit core insn"));
|
||
break;
|
||
}
|
||
}
|
||
else if (corelength == 32)
|
||
{
|
||
/* V2 mode: we need a P1 slot. */
|
||
switch (num_insns_saved)
|
||
{
|
||
case 1:
|
||
/* No other insns, fill with NOPs. */
|
||
break;
|
||
case 2:
|
||
/* The other insn must allow P1. */
|
||
if (!slot_ok (1, SLOTS_P1))
|
||
as_bad (_("cannot pack %s into slot P1"),
|
||
CGEN_INSN_NAME (saved_insns[1].insn));
|
||
else
|
||
slots[SLOTS_P1] = 1;
|
||
break;
|
||
default:
|
||
as_bad (_("too many IVC2 insns to pack with a 32-bit core insn"));
|
||
break;
|
||
}
|
||
}
|
||
else if (corelength == 0)
|
||
{
|
||
/* V3 mode: we need a P0 slot and a P1 slot, or a P0S+P1 with a
|
||
core NOP. */
|
||
switch (num_insns_saved)
|
||
{
|
||
case 1:
|
||
if (slot_ok (0, SLOTS_P0))
|
||
slots[SLOTS_P0] = 0;
|
||
else if (slot_ok (0, SLOTS_P1))
|
||
slots[SLOTS_P1] = 0;
|
||
else if (slot_ok (0, SLOTS_P0S))
|
||
slots[SLOTS_P0S] = 0;
|
||
else
|
||
as_bad (_("unable to pack %s by itself?"),
|
||
CGEN_INSN_NAME (saved_insns[0].insn));
|
||
break;
|
||
|
||
case 2:
|
||
if (slot_ok (0, SLOTS_P0)
|
||
&& slot_ok (1, SLOTS_P1))
|
||
{
|
||
slots[SLOTS_P0] = 0;
|
||
slots[SLOTS_P1] = 1;
|
||
}
|
||
else if (slot_ok (0, SLOTS_P1)
|
||
&& slot_ok (1, SLOTS_P0))
|
||
{
|
||
slots[SLOTS_P1] = 0;
|
||
slots[SLOTS_P0] = 1;
|
||
}
|
||
else if (slot_ok (0, SLOTS_P0S)
|
||
&& slot_ok (1, SLOTS_P1))
|
||
{
|
||
slots[SLOTS_P0S] = 0;
|
||
slots[SLOTS_P1] = 1;
|
||
}
|
||
else if (slot_ok (0, SLOTS_P1)
|
||
&& slot_ok (1, SLOTS_P0S))
|
||
{
|
||
slots[SLOTS_P1] = 0;
|
||
slots[SLOTS_P0S] = 1;
|
||
}
|
||
else
|
||
as_bad (_("cannot pack %s and %s together"),
|
||
CGEN_INSN_NAME (saved_insns[0].insn),
|
||
CGEN_INSN_NAME (saved_insns[1].insn));
|
||
break;
|
||
|
||
default:
|
||
as_bad (_("too many IVC2 insns to pack together"));
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* The core insn needs to be done normally so that fixups,
|
||
relaxation, etc are done. Other IVC2 insns need only be resolved
|
||
to bit patterns; there are no relocations for them. */
|
||
if (slots[SLOTS_CORE] != -1)
|
||
{
|
||
gas_cgen_restore_fixups (0);
|
||
gas_cgen_finish_insn (saved_insns[0].insn, saved_insns[0].buffer,
|
||
CGEN_FIELDS_BITSIZE (& saved_insns[0].fields),
|
||
1, NULL);
|
||
}
|
||
|
||
/* Allocate whatever bytes remain in our insn word. Adjust the
|
||
pointer to point (as if it were) to the beginning of the whole
|
||
word, so that we don't have to adjust for it elsewhere. */
|
||
f = (bfd_byte *) frag_more (8 - realcorelength / 8);
|
||
/* Unused slots are filled with NOPs, which happen to be all zeros. */
|
||
memset (f, 0, 8 - realcorelength / 8);
|
||
f -= realcorelength / 8;
|
||
|
||
for (i=1; i<5; i++)
|
||
{
|
||
mep_insn *m;
|
||
|
||
if (slots[i] == -1)
|
||
continue;
|
||
|
||
m = & saved_insns[slots[i]];
|
||
|
||
#if CGEN_INT_INSN_P
|
||
cgen_put_insn_value (gas_cgen_cpu_desc, (unsigned char *) temp, 32,
|
||
m->buffer[0]);
|
||
#else
|
||
memcpy (temp, m->buffer, byte_len);
|
||
#endif
|
||
|
||
switch (i)
|
||
{
|
||
case SLOTS_P0S:
|
||
f[2^e] = temp[1^e];
|
||
f[3^e] = temp[2^e];
|
||
f[4^e] |= temp[3^e] & 0xf0;
|
||
break;
|
||
case SLOTS_P0:
|
||
f[0^e] = 0xf0 | temp[0^e] >> 4;
|
||
f[1^e] = temp[0^e] << 4 | 0x07;
|
||
f[2^e] = temp[1^e];
|
||
f[3^e] = temp[2^e];
|
||
f[4^e] |= temp[3^e] & 0xf0;
|
||
break;
|
||
case SLOTS_P1:
|
||
f[4^e] |= temp[0^e] >> 4;
|
||
f[5^e] = temp[0^e] << 4 | temp[1^e] >> 4;
|
||
f[6^e] = temp[1^e] << 4 | temp[2^e] >> 4;
|
||
f[7^e] = temp[2^e] << 4 | temp[3^e] >> 4;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
#endif /* MEP_IVC2_SUPPORTED */
|
||
|
||
/* The scheduling functions are just filters for invalid combinations.
|
||
If there is a violation, they terminate assembly. Otherise they
|
||
just fall through. Succesful combinations cause no side effects
|
||
other than valid nop insertion. */
|
||
|
||
static void
|
||
mep_check_parallel_scheduling (void)
|
||
{
|
||
/* This is where we will eventually read the config information
|
||
and choose which scheduling checking function to call. */
|
||
#ifdef MEP_IVC2_SUPPORTED
|
||
if (mep_cop == EF_MEP_COP_IVC2)
|
||
mep_check_ivc2_scheduling ();
|
||
else
|
||
#endif /* MEP_IVC2_SUPPORTED */
|
||
if (MEP_VLIW64)
|
||
mep_check_parallel64_scheduling ();
|
||
else
|
||
mep_check_parallel32_scheduling ();
|
||
}
|
||
|
||
static void
|
||
mep_process_saved_insns (void)
|
||
{
|
||
int i;
|
||
|
||
gas_cgen_save_fixups (MAX_SAVED_FIXUP_CHAINS - 1);
|
||
|
||
/* We have to check for valid scheduling here. */
|
||
mep_check_parallel_scheduling ();
|
||
|
||
/* IVC2 has to pack instructions in a funny way, so it does it
|
||
itself. */
|
||
if (mep_cop != EF_MEP_COP_IVC2)
|
||
{
|
||
/* If the last call didn't cause assembly to terminate, we have
|
||
a valid vliw insn/insn pair saved. Restore this instructions'
|
||
fixups and process the insns. */
|
||
for (i = 0;i<num_insns_saved;i++)
|
||
{
|
||
gas_cgen_restore_fixups (i);
|
||
gas_cgen_finish_insn (saved_insns[i].insn, saved_insns[i].buffer,
|
||
CGEN_FIELDS_BITSIZE (& saved_insns[i].fields),
|
||
1, NULL);
|
||
}
|
||
}
|
||
gas_cgen_restore_fixups (MAX_SAVED_FIXUP_CHAINS - 1);
|
||
|
||
/* Clear the fixups and reset the number insn saved to 0. */
|
||
gas_cgen_initialize_saved_fixups_array ();
|
||
num_insns_saved = 0;
|
||
listing_prev_line ();
|
||
}
|
||
|
||
void
|
||
md_assemble (char * str)
|
||
{
|
||
static CGEN_BITSET* isas = NULL;
|
||
char * errmsg;
|
||
|
||
/* Initialize GAS's cgen interface for a new instruction. */
|
||
gas_cgen_init_parse ();
|
||
|
||
/* There are two possible modes: core and vliw. We have to assemble
|
||
differently for each.
|
||
|
||
Core Mode: We assemble normally. All instructions are on a
|
||
single line and are made up of one mnemonic and one
|
||
set of operands.
|
||
VLIW Mode: Vliw combinations are indicated as follows:
|
||
|
||
core insn
|
||
+ copro insn
|
||
|
||
We want to handle the general case where more than
|
||
one instruction can be preceeded by a +. This will
|
||
happen later if we add support for internally parallel
|
||
coprocessors. We'll make the parsing nice and general
|
||
so that it can handle an arbitrary number of insns
|
||
with leading +'s. The actual checking for valid
|
||
combinations is done elsewhere. */
|
||
|
||
/* Initialize the isa to refer to the core. */
|
||
if (isas == NULL)
|
||
isas = cgen_bitset_copy (& MEP_CORE_ISA);
|
||
else
|
||
{
|
||
cgen_bitset_clear (isas);
|
||
cgen_bitset_union (isas, & MEP_CORE_ISA, isas);
|
||
}
|
||
gas_cgen_cpu_desc->isas = isas;
|
||
|
||
if (mode == VLIW)
|
||
{
|
||
/* VLIW mode. */
|
||
|
||
int thisInsnIsCopro = 0;
|
||
mep_insn insn;
|
||
int i;
|
||
|
||
/* Initialize the insn buffer */
|
||
|
||
if (! CGEN_INT_INSN_P)
|
||
for (i=0; i < CGEN_MAX_INSN_SIZE; i++)
|
||
insn.buffer[i]='\0';
|
||
|
||
|
||
/* IVC2 has two sets of coprocessor opcodes, one for CORE mode
|
||
and one for VLIW mode. They have the same names. To specify
|
||
which one we want, we use the COP isas - the 32 bit ISA is
|
||
for the core instructions (which are always 32 bits), and the
|
||
other ISAs are for the VLIW ones (which always pack into 64
|
||
bit insns). We use other attributes to determine slotting
|
||
later. */
|
||
if (mep_cop == EF_MEP_COP_IVC2)
|
||
{
|
||
cgen_bitset_union (isas, & MEP_COP16_ISA, isas);
|
||
cgen_bitset_union (isas, & MEP_COP48_ISA, isas);
|
||
cgen_bitset_union (isas, & MEP_COP64_ISA, isas);
|
||
}
|
||
else
|
||
{
|
||
/* Can't tell core / copro insns apart at parse time! */
|
||
cgen_bitset_union (isas, & MEP_COP_ISA, isas);
|
||
}
|
||
|
||
/* Assemble the insn so we can examine its attributes. */
|
||
insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, str,
|
||
&insn.fields, insn.buffer,
|
||
&errmsg);
|
||
if (!insn.insn)
|
||
{
|
||
as_bad ("%s", errmsg);
|
||
return;
|
||
}
|
||
mep_check_for_disabled_registers (&insn);
|
||
|
||
/* Check to see if it's a coprocessor instruction. */
|
||
thisInsnIsCopro = MEP_INSN_COP_P (insn.insn);
|
||
|
||
if (!thisInsnIsCopro)
|
||
{
|
||
insn.insn = mep_cgen_assemble_cop_insn (gas_cgen_cpu_desc, str,
|
||
&insn.fields, insn.buffer,
|
||
insn.insn);
|
||
thisInsnIsCopro = MEP_INSN_COP_P (insn.insn);
|
||
mep_check_for_disabled_registers (&insn);
|
||
}
|
||
|
||
if (pluspresent)
|
||
{
|
||
/* A plus was present. */
|
||
/* Check for a + with a core insn and abort if found. */
|
||
if (!thisInsnIsCopro)
|
||
{
|
||
as_fatal("A core insn cannot be preceeded by a +.\n");
|
||
return;
|
||
}
|
||
|
||
if (num_insns_saved > 0)
|
||
{
|
||
/* There are insns in the queue. Add this one. */
|
||
mep_save_insn (insn);
|
||
}
|
||
else
|
||
{
|
||
/* There are no insns in the queue and a plus is present.
|
||
This is a syntax error. Let's not tolerate this.
|
||
We can relax this later if necessary. */
|
||
as_bad (_("Invalid use of parallelization operator."));
|
||
return;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* No plus was present. */
|
||
if (num_insns_saved > 0)
|
||
{
|
||
/* There are insns saved and we came across an insn without a
|
||
leading +. That's the signal to process the saved insns
|
||
before proceeding then treat the current insn as the first
|
||
in a new vliw group. */
|
||
mep_process_saved_insns ();
|
||
num_insns_saved = 0;
|
||
/* mep_save_insn (insn); */
|
||
}
|
||
mep_save_insn (insn);
|
||
#if 0
|
||
else
|
||
{
|
||
|
||
/* Core Insn. Add it to the beginning of the queue. */
|
||
mep_save_insn (insn);
|
||
/* gas_cgen_save_fixups(num_insns_saved); */
|
||
}
|
||
#endif
|
||
}
|
||
|
||
pluspresent = 0;
|
||
}
|
||
else
|
||
{
|
||
/* Core mode. */
|
||
|
||
/* Only single instructions are assembled in core mode. */
|
||
mep_insn insn;
|
||
|
||
/* See comment in the VLIW clause above about this. */
|
||
if (mep_cop & EF_MEP_COP_IVC2)
|
||
cgen_bitset_union (isas, & MEP_COP32_ISA, isas);
|
||
|
||
/* If a leading '+' was present, issue an error.
|
||
That's not allowed in core mode. */
|
||
if (pluspresent)
|
||
{
|
||
as_bad (_("Leading plus sign not allowed in core mode"));
|
||
return;
|
||
}
|
||
|
||
insn.insn = mep_cgen_assemble_insn
|
||
(gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
|
||
|
||
if (!insn.insn)
|
||
{
|
||
as_bad ("%s", errmsg);
|
||
return;
|
||
}
|
||
gas_cgen_finish_insn (insn.insn, insn.buffer,
|
||
CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
|
||
mep_check_for_disabled_registers (&insn);
|
||
}
|
||
}
|
||
|
||
valueT
|
||
md_section_align (segT segment, valueT size)
|
||
{
|
||
int align = bfd_get_section_alignment (stdoutput, segment);
|
||
return ((size + (1 << align) - 1) & (-1 << align));
|
||
}
|
||
|
||
|
||
symbolS *
|
||
md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* Interface to relax_segment. */
|
||
|
||
|
||
const relax_typeS md_relax_table[] =
|
||
{
|
||
/* The fields are:
|
||
1) most positive reach of this state,
|
||
2) most negative reach of this state,
|
||
3) how many bytes this mode will have in the variable part of the frag
|
||
4) which index into the table to try if we can't fit into this one. */
|
||
/* Note that we use "beq" because "jmp" has a peculiarity - it cannot
|
||
jump to addresses with any bits 27..24 set. So, we use beq as a
|
||
17-bit pc-relative branch to avoid using jmp, just in case. */
|
||
|
||
/* 0 */ { 0, 0, 0, 0 }, /* unused */
|
||
/* 1 */ { 0, 0, 0, 0 }, /* marker for "don't know yet" */
|
||
|
||
/* 2 */ { 2047, -2048, 0, 3 }, /* bsr12 */
|
||
/* 3 */ { 0, 0, 2, 0 }, /* bsr16 */
|
||
|
||
/* 4 */ { 2047, -2048, 0, 5 }, /* bra */
|
||
/* 5 */ { 65535, -65536, 2, 6 }, /* beq $0,$0 */
|
||
/* 6 */ { 0, 0, 2, 0 }, /* jmp24 */
|
||
|
||
/* 7 */ { 65535, -65536, 0, 8 }, /* beqi */
|
||
/* 8 */ { 0, 0, 4, 0 }, /* bnei/jmp */
|
||
|
||
/* 9 */ { 127, -128, 0, 10 }, /* beqz */
|
||
/* 10 */ { 65535, -65536, 2, 11 }, /* beqi */
|
||
/* 11 */ { 0, 0, 4, 0 }, /* bnei/jmp */
|
||
|
||
/* 12 */ { 65535, -65536, 0, 13 }, /* bnei */
|
||
/* 13 */ { 0, 0, 4, 0 }, /* beqi/jmp */
|
||
|
||
/* 14 */ { 127, -128, 0, 15 }, /* bnez */
|
||
/* 15 */ { 65535, -65536, 2, 16 }, /* bnei */
|
||
/* 16 */ { 0, 0, 4, 0 }, /* beqi/jmp */
|
||
|
||
/* 17 */ { 65535, -65536, 0, 13 }, /* bgei */
|
||
/* 18 */ { 0, 0, 4, 0 },
|
||
/* 19 */ { 65535, -65536, 0, 13 }, /* blti */
|
||
/* 20 */ { 0, 0, 4, 0 },
|
||
/* 19 */ { 65535, -65536, 0, 13 }, /* bcpeq */
|
||
/* 20 */ { 0, 0, 4, 0 },
|
||
/* 19 */ { 65535, -65536, 0, 13 }, /* bcpne */
|
||
/* 20 */ { 0, 0, 4, 0 },
|
||
/* 19 */ { 65535, -65536, 0, 13 }, /* bcpat */
|
||
/* 20 */ { 0, 0, 4, 0 },
|
||
/* 19 */ { 65535, -65536, 0, 13 }, /* bcpaf */
|
||
/* 20 */ { 0, 0, 4, 0 }
|
||
};
|
||
|
||
/* Pseudo-values for 64 bit "insns" which are combinations of two 32
|
||
bit insns. */
|
||
typedef enum {
|
||
MEP_PSEUDO64_NONE,
|
||
MEP_PSEUDO64_16BITCC,
|
||
MEP_PSEUDO64_32BITCC,
|
||
} MepPseudo64Values;
|
||
|
||
static struct {
|
||
int insn;
|
||
int growth;
|
||
int insn_for_extern;
|
||
} subtype_mappings[] = {
|
||
{ 0, 0, 0 },
|
||
{ 0, 0, 0 },
|
||
{ MEP_INSN_BSR12, 0, MEP_INSN_BSR24 },
|
||
{ MEP_INSN_BSR24, 2, MEP_INSN_BSR24 },
|
||
{ MEP_INSN_BRA, 0, MEP_INSN_BRA },
|
||
{ MEP_INSN_BEQ, 2, MEP_INSN_BEQ },
|
||
{ MEP_INSN_JMP, 2, MEP_INSN_JMP },
|
||
{ MEP_INSN_BEQI, 0, MEP_INSN_BEQI },
|
||
{ -1, 4, MEP_PSEUDO64_32BITCC },
|
||
{ MEP_INSN_BEQZ, 0, MEP_INSN_BEQZ },
|
||
{ MEP_INSN_BEQI, 2, MEP_INSN_BEQI },
|
||
{ -1, 4, MEP_PSEUDO64_16BITCC },
|
||
{ MEP_INSN_BNEI, 0, MEP_INSN_BNEI },
|
||
{ -1, 4, MEP_PSEUDO64_32BITCC },
|
||
{ MEP_INSN_BNEZ, 0, MEP_INSN_BNEZ },
|
||
{ MEP_INSN_BNEI, 2, MEP_INSN_BNEI },
|
||
{ -1, 4, MEP_PSEUDO64_16BITCC },
|
||
{ MEP_INSN_BGEI, 0, MEP_INSN_BGEI },
|
||
{ -1, 4, MEP_PSEUDO64_32BITCC },
|
||
{ MEP_INSN_BLTI, 0, MEP_INSN_BLTI },
|
||
{ -1, 4, MEP_PSEUDO64_32BITCC },
|
||
{ MEP_INSN_BCPEQ, 0, MEP_INSN_BCPEQ },
|
||
{ -1, 4, MEP_PSEUDO64_32BITCC },
|
||
{ MEP_INSN_BCPNE, 0, MEP_INSN_BCPNE },
|
||
{ -1, 4, MEP_PSEUDO64_32BITCC },
|
||
{ MEP_INSN_BCPAT, 0, MEP_INSN_BCPAT },
|
||
{ -1, 4, MEP_PSEUDO64_32BITCC },
|
||
{ MEP_INSN_BCPAF, 0, MEP_INSN_BCPAF },
|
||
{ -1, 4, MEP_PSEUDO64_32BITCC }
|
||
};
|
||
#define NUM_MAPPINGS (sizeof (subtype_mappings) / sizeof (subtype_mappings[0]))
|
||
|
||
void
|
||
mep_prepare_relax_scan (fragS *fragP, offsetT *aim, relax_substateT this_state)
|
||
{
|
||
symbolS *symbolP = fragP->fr_symbol;
|
||
if (symbolP && !S_IS_DEFINED (symbolP))
|
||
*aim = 0;
|
||
/* Adjust for MeP pcrel not being relative to the next opcode. */
|
||
*aim += 2 + md_relax_table[this_state].rlx_length;
|
||
}
|
||
|
||
static int
|
||
insn_to_subtype (int insn)
|
||
{
|
||
unsigned int i;
|
||
for (i=0; i<NUM_MAPPINGS; i++)
|
||
if (insn == subtype_mappings[i].insn)
|
||
return i;
|
||
abort ();
|
||
}
|
||
|
||
/* Return an initial guess of the length by which a fragment must grow
|
||
to hold a branch to reach its destination. Also updates fr_type
|
||
and fr_subtype as necessary.
|
||
|
||
Called just before doing relaxation. Any symbol that is now
|
||
undefined will not become defined. The guess for fr_var is
|
||
ACTUALLY the growth beyond fr_fix. Whatever we do to grow fr_fix
|
||
or fr_var contributes to our returned value. Although it may not
|
||
be explicit in the frag, pretend fr_var starts with a 0 value. */
|
||
|
||
int
|
||
md_estimate_size_before_relax (fragS * fragP, segT segment)
|
||
{
|
||
if (fragP->fr_subtype == 1)
|
||
fragP->fr_subtype = insn_to_subtype (fragP->fr_cgen.insn->base->num);
|
||
|
||
if (S_GET_SEGMENT (fragP->fr_symbol) != segment
|
||
|| S_IS_WEAK (fragP->fr_symbol)
|
||
#ifdef MEP_IVC2_SUPPORTED
|
||
|| (mep_cop == EF_MEP_COP_IVC2
|
||
&& bfd_get_section_flags (stdoutput, segment) & SEC_MEP_VLIW)
|
||
#endif /* MEP_IVC2_SUPPORTED */
|
||
)
|
||
{
|
||
int new_insn;
|
||
|
||
new_insn = subtype_mappings[fragP->fr_subtype].insn_for_extern;
|
||
fragP->fr_subtype = insn_to_subtype (new_insn);
|
||
}
|
||
|
||
if (MEP_VLIW && ! MEP_VLIW64
|
||
&& (bfd_get_section_flags (stdoutput, segment) & SEC_MEP_VLIW))
|
||
{
|
||
/* Use 32 bit branches for vliw32 so the vliw word is not split. */
|
||
switch (fragP->fr_cgen.insn->base->num)
|
||
{
|
||
case MEP_INSN_BSR12:
|
||
fragP->fr_subtype = insn_to_subtype
|
||
(subtype_mappings[fragP->fr_subtype].insn_for_extern);
|
||
break;
|
||
case MEP_INSN_BEQZ:
|
||
fragP->fr_subtype ++;
|
||
break;
|
||
case MEP_INSN_BNEZ:
|
||
fragP->fr_subtype ++;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (fragP->fr_cgen.insn->base
|
||
&& fragP->fr_cgen.insn->base->num
|
||
!= subtype_mappings[fragP->fr_subtype].insn)
|
||
{
|
||
int new_insn= subtype_mappings[fragP->fr_subtype].insn;
|
||
if (new_insn != -1)
|
||
{
|
||
fragP->fr_cgen.insn = (fragP->fr_cgen.insn
|
||
- fragP->fr_cgen.insn->base->num
|
||
+ new_insn);
|
||
}
|
||
}
|
||
|
||
#ifdef MEP_IVC2_SUPPORTED
|
||
if (mep_cop == EF_MEP_COP_IVC2
|
||
&& bfd_get_section_flags (stdoutput, segment) & SEC_MEP_VLIW)
|
||
return 0;
|
||
#endif /* MEP_IVC2_SUPPORTED */
|
||
|
||
return subtype_mappings[fragP->fr_subtype].growth;
|
||
}
|
||
|
||
/* VLIW does relaxing, but not growth. */
|
||
|
||
long
|
||
mep_relax_frag (segT segment, fragS *fragP, long stretch)
|
||
{
|
||
long rv = relax_frag (segment, fragP, stretch);
|
||
#ifdef MEP_IVC2_SUPPORTED
|
||
if (mep_cop == EF_MEP_COP_IVC2
|
||
&& bfd_get_section_flags (stdoutput, segment) & SEC_MEP_VLIW)
|
||
return 0;
|
||
#endif
|
||
return rv;
|
||
}
|
||
|
||
/* *fragP has been relaxed to its final size, and now needs to have
|
||
the bytes inside it modified to conform to the new size.
|
||
|
||
Called after relaxation is finished.
|
||
fragP->fr_type == rs_machine_dependent.
|
||
fragP->fr_subtype is the subtype of what the address relaxed to. */
|
||
|
||
static int
|
||
target_address_for (fragS *frag)
|
||
{
|
||
int rv = frag->fr_offset;
|
||
symbolS *sym = frag->fr_symbol;
|
||
|
||
if (sym)
|
||
rv += S_GET_VALUE (sym);
|
||
|
||
return rv;
|
||
}
|
||
|
||
void
|
||
md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
|
||
segT seg ATTRIBUTE_UNUSED,
|
||
fragS *fragP)
|
||
{
|
||
int addend, rn, bit = 0;
|
||
int operand;
|
||
int where = fragP->fr_opcode - fragP->fr_literal;
|
||
int e = target_big_endian ? 0 : 1;
|
||
int core_mode;
|
||
|
||
#ifdef MEP_IVC2_SUPPORTED
|
||
if (bfd_get_section_flags (stdoutput, seg) & SEC_MEP_VLIW
|
||
&& mep_cop == EF_MEP_COP_IVC2)
|
||
core_mode = 0;
|
||
else
|
||
#endif /* MEP_IVC2_SUPPORTED */
|
||
core_mode = 1;
|
||
|
||
addend = target_address_for (fragP) - (fragP->fr_address + where);
|
||
|
||
if (subtype_mappings[fragP->fr_subtype].insn == -1)
|
||
{
|
||
if (core_mode)
|
||
fragP->fr_fix += subtype_mappings[fragP->fr_subtype].growth;
|
||
switch (subtype_mappings[fragP->fr_subtype].insn_for_extern)
|
||
{
|
||
case MEP_PSEUDO64_16BITCC:
|
||
fragP->fr_opcode[1^e] = ((fragP->fr_opcode[1^e] & 1) ^ 1) | 0x06;
|
||
fragP->fr_opcode[2^e] = 0xd8;
|
||
fragP->fr_opcode[3^e] = 0x08;
|
||
fragP->fr_opcode[4^e] = 0;
|
||
fragP->fr_opcode[5^e] = 0;
|
||
where += 2;
|
||
break;
|
||
case MEP_PSEUDO64_32BITCC:
|
||
if (fragP->fr_opcode[0^e] & 0x10)
|
||
fragP->fr_opcode[1^e] ^= 0x01;
|
||
else
|
||
fragP->fr_opcode[1^e] ^= 0x04;
|
||
fragP->fr_opcode[2^e] = 0;
|
||
fragP->fr_opcode[3^e] = 4;
|
||
fragP->fr_opcode[4^e] = 0xd8;
|
||
fragP->fr_opcode[5^e] = 0x08;
|
||
fragP->fr_opcode[6^e] = 0;
|
||
fragP->fr_opcode[7^e] = 0;
|
||
where += 4;
|
||
break;
|
||
default:
|
||
abort ();
|
||
}
|
||
fragP->fr_cgen.insn = (fragP->fr_cgen.insn
|
||
- fragP->fr_cgen.insn->base->num
|
||
+ MEP_INSN_JMP);
|
||
operand = MEP_OPERAND_PCABS24A2;
|
||
}
|
||
else
|
||
switch (fragP->fr_cgen.insn->base->num)
|
||
{
|
||
case MEP_INSN_BSR12:
|
||
fragP->fr_opcode[0^e] = 0xb0 | ((addend >> 8) & 0x0f);
|
||
fragP->fr_opcode[1^e] = 0x01 | (addend & 0xfe);
|
||
operand = MEP_OPERAND_PCREL12A2;
|
||
break;
|
||
|
||
case MEP_INSN_BSR24:
|
||
if (core_mode)
|
||
fragP->fr_fix += 2;
|
||
fragP->fr_opcode[0^e] = 0xd8 | ((addend >> 5) & 0x07);
|
||
fragP->fr_opcode[1^e] = 0x09 | ((addend << 3) & 0xf0);
|
||
fragP->fr_opcode[2^e] = 0x00 | ((addend >>16) & 0xff);
|
||
fragP->fr_opcode[3^e] = 0x00 | ((addend >> 8) & 0xff);
|
||
operand = MEP_OPERAND_PCREL24A2;
|
||
break;
|
||
|
||
case MEP_INSN_BRA:
|
||
fragP->fr_opcode[0^e] = 0xb0 | ((addend >> 8) & 0x0f);
|
||
fragP->fr_opcode[1^e] = 0x00 | (addend & 0xfe);
|
||
operand = MEP_OPERAND_PCREL12A2;
|
||
break;
|
||
|
||
case MEP_INSN_BEQ:
|
||
/* The default relax_frag doesn't change the state if there is no
|
||
growth, so we must manually handle converting out-of-range BEQ
|
||
instructions to JMP. */
|
||
if (addend <= 65535 && addend >= -65536)
|
||
{
|
||
if (core_mode)
|
||
fragP->fr_fix += 2;
|
||
fragP->fr_opcode[0^e] = 0xe0;
|
||
fragP->fr_opcode[1^e] = 0x01;
|
||
fragP->fr_opcode[2^e] = 0x00 | ((addend >> 9) & 0xff);
|
||
fragP->fr_opcode[3^e] = 0x00 | ((addend >> 1) & 0xff);
|
||
operand = MEP_OPERAND_PCREL17A2;
|
||
break;
|
||
}
|
||
/* ...FALLTHROUGH... */
|
||
|
||
case MEP_INSN_JMP:
|
||
addend = target_address_for (fragP);
|
||
if (core_mode)
|
||
fragP->fr_fix += 2;
|
||
fragP->fr_opcode[0^e] = 0xd8 | ((addend >> 5) & 0x07);
|
||
fragP->fr_opcode[1^e] = 0x08 | ((addend << 3) & 0xf0);
|
||
fragP->fr_opcode[2^e] = 0x00 | ((addend >>16) & 0xff);
|
||
fragP->fr_opcode[3^e] = 0x00 | ((addend >> 8) & 0xff);
|
||
operand = MEP_OPERAND_PCABS24A2;
|
||
break;
|
||
|
||
case MEP_INSN_BNEZ:
|
||
bit = 1;
|
||
case MEP_INSN_BEQZ:
|
||
fragP->fr_opcode[1^e] = bit | (addend & 0xfe);
|
||
operand = MEP_OPERAND_PCREL8A2;
|
||
break;
|
||
|
||
case MEP_INSN_BNEI:
|
||
bit = 4;
|
||
case MEP_INSN_BEQI:
|
||
if (subtype_mappings[fragP->fr_subtype].growth)
|
||
{
|
||
if (core_mode)
|
||
fragP->fr_fix += subtype_mappings[fragP->fr_subtype].growth;
|
||
rn = fragP->fr_opcode[0^e] & 0x0f;
|
||
fragP->fr_opcode[0^e] = 0xe0 | rn;
|
||
fragP->fr_opcode[1^e] = bit;
|
||
}
|
||
fragP->fr_opcode[2^e] = 0x00 | ((addend >> 9) & 0xff);
|
||
fragP->fr_opcode[3^e] = 0x00 | ((addend >> 1) & 0xff);
|
||
operand = MEP_OPERAND_PCREL17A2;
|
||
break;
|
||
|
||
case MEP_INSN_BLTI:
|
||
case MEP_INSN_BGEI:
|
||
case MEP_INSN_BCPEQ:
|
||
case MEP_INSN_BCPNE:
|
||
case MEP_INSN_BCPAT:
|
||
case MEP_INSN_BCPAF:
|
||
/* No opcode change needed, just operand. */
|
||
fragP->fr_opcode[2^e] = (addend >> 9) & 0xff;
|
||
fragP->fr_opcode[3^e] = (addend >> 1) & 0xff;
|
||
operand = MEP_OPERAND_PCREL17A2;
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
|
||
if (S_GET_SEGMENT (fragP->fr_symbol) != seg
|
||
|| S_IS_WEAK (fragP->fr_symbol)
|
||
|| operand == MEP_OPERAND_PCABS24A2)
|
||
{
|
||
gas_assert (fragP->fr_cgen.insn != 0);
|
||
gas_cgen_record_fixup (fragP,
|
||
where,
|
||
fragP->fr_cgen.insn,
|
||
(fragP->fr_fix - where) * 8,
|
||
cgen_operand_lookup_by_num (gas_cgen_cpu_desc,
|
||
operand),
|
||
fragP->fr_cgen.opinfo,
|
||
fragP->fr_symbol, fragP->fr_offset);
|
||
}
|
||
}
|
||
|
||
|
||
/* Functions concerning relocs. */
|
||
|
||
void
|
||
mep_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
|
||
{
|
||
/* If we already know the fixup value, adjust it in the same
|
||
way that the linker would have done. */
|
||
if (fixP->fx_addsy == 0)
|
||
switch (fixP->fx_cgen.opinfo)
|
||
{
|
||
case BFD_RELOC_MEP_LOW16:
|
||
*valP = ((long)(*valP & 0xffff)) << 16 >> 16;
|
||
break;
|
||
case BFD_RELOC_MEP_HI16U:
|
||
*valP >>= 16;
|
||
break;
|
||
case BFD_RELOC_MEP_HI16S:
|
||
*valP = (*valP + 0x8000) >> 16;
|
||
break;
|
||
}
|
||
|
||
/* Now call cgen's md_aply_fix. */
|
||
gas_cgen_md_apply_fix (fixP, valP, seg);
|
||
}
|
||
|
||
long
|
||
md_pcrel_from_section (fixS *fixP, segT sec)
|
||
{
|
||
if (fixP->fx_addsy != (symbolS *) NULL
|
||
&& (! S_IS_DEFINED (fixP->fx_addsy)
|
||
|| S_IS_WEAK (fixP->fx_addsy)
|
||
|| S_GET_SEGMENT (fixP->fx_addsy) != sec))
|
||
/* The symbol is undefined (or is defined but not in this section).
|
||
Let the linker figure it out. */
|
||
return 0;
|
||
|
||
/* If we've got other reasons for emitting this relocation, let the
|
||
linker handle pc-rel also. */
|
||
if (mep_force_relocation (fixP))
|
||
return 0;
|
||
|
||
/* Return the address of the opcode - cgen adjusts for opcode size
|
||
itself, to be consistent with the disassembler, which must do
|
||
so. */
|
||
return fixP->fx_where + fixP->fx_frag->fr_address;
|
||
}
|
||
|
||
/* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
|
||
Returns BFD_RELOC_NONE if no reloc type can be found.
|
||
*FIXP may be modified if desired. */
|
||
|
||
#if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE)
|
||
#define MAP(n) case MEP_OPERAND_##n: return BFD_RELOC_MEP_##n;
|
||
#else
|
||
#define MAP(n) case MEP_OPERAND_/**/n: return BFD_RELOC_MEP_/**/n;
|
||
#endif
|
||
|
||
bfd_reloc_code_real_type
|
||
md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED,
|
||
const CGEN_OPERAND *operand,
|
||
fixS *fixP)
|
||
{
|
||
enum bfd_reloc_code_real reloc = fixP->fx_cgen.opinfo;
|
||
static char printed[MEP_OPERAND_MAX] = { 0 };
|
||
|
||
/* If there's a reloc here, it's because the parser saw a %foo() and
|
||
is giving us the correct reloc to use, or because we converted to
|
||
a different size reloc below and want to avoid "converting" more
|
||
than once. */
|
||
if (reloc && reloc != BFD_RELOC_NONE)
|
||
return reloc;
|
||
|
||
switch (operand->type)
|
||
{
|
||
MAP (PCREL8A2); /* beqz */
|
||
MAP (PCREL12A2); /* bsr16 */
|
||
MAP (PCREL17A2); /* beqi */
|
||
MAP (PCREL24A2); /* bsr24 */
|
||
MAP (PCABS24A2); /* jmp */
|
||
MAP (UIMM24); /* mov */
|
||
MAP (ADDR24A4); /* sw/lw */
|
||
|
||
/* The rest of the relocs should be generated by the parser,
|
||
for things such as %tprel(), etc. */
|
||
case MEP_OPERAND_SIMM16:
|
||
#ifdef OBJ_COMPLEX_RELC
|
||
/* coalescing this into RELOC_MEP_16 is actually a bug,
|
||
since it's a signed operand. let the relc code handle it. */
|
||
return BFD_RELOC_RELC;
|
||
#endif
|
||
|
||
case MEP_OPERAND_UIMM16:
|
||
case MEP_OPERAND_SDISP16:
|
||
case MEP_OPERAND_CODE16:
|
||
fixP->fx_where += 2;
|
||
/* to avoid doing the above add twice */
|
||
fixP->fx_cgen.opinfo = BFD_RELOC_MEP_16;
|
||
return BFD_RELOC_MEP_16;
|
||
|
||
default:
|
||
#ifdef OBJ_COMPLEX_RELC
|
||
/* this is not an error, yet.
|
||
pass it to the linker. */
|
||
return BFD_RELOC_RELC;
|
||
#endif
|
||
if (printed[operand->type])
|
||
return BFD_RELOC_NONE;
|
||
printed[operand->type] = 1;
|
||
|
||
as_bad_where (fixP->fx_file, fixP->fx_line,
|
||
_("Don't know how to relocate plain operands of type %s"),
|
||
operand->name);
|
||
|
||
/* Print some helpful hints for the user. */
|
||
switch (operand->type)
|
||
{
|
||
case MEP_OPERAND_UDISP7:
|
||
case MEP_OPERAND_UDISP7A2:
|
||
case MEP_OPERAND_UDISP7A4:
|
||
as_bad_where (fixP->fx_file, fixP->fx_line,
|
||
_("Perhaps you are missing %%tpoff()?"));
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
return BFD_RELOC_NONE;
|
||
}
|
||
}
|
||
|
||
/* Called while parsing an instruction to create a fixup.
|
||
We need to check for HI16 relocs and queue them up for later sorting. */
|
||
|
||
fixS *
|
||
mep_cgen_record_fixup_exp (fragS *frag,
|
||
int where,
|
||
const CGEN_INSN *insn,
|
||
int length,
|
||
const CGEN_OPERAND *operand,
|
||
int opinfo,
|
||
expressionS *exp)
|
||
{
|
||
fixS * fixP = gas_cgen_record_fixup_exp (frag, where, insn, length,
|
||
operand, opinfo, exp);
|
||
return fixP;
|
||
}
|
||
|
||
/* Return BFD reloc type from opinfo field in a fixS.
|
||
It's tricky using fx_r_type in mep_frob_file because the values
|
||
are BFD_RELOC_UNUSED + operand number. */
|
||
#define FX_OPINFO_R_TYPE(f) ((f)->fx_cgen.opinfo)
|
||
|
||
/* Sort any unmatched HI16 relocs so that they immediately precede
|
||
the corresponding LO16 reloc. This is called before md_apply_fix and
|
||
tc_gen_reloc. */
|
||
|
||
void
|
||
mep_frob_file ()
|
||
{
|
||
struct mep_hi_fixup * l;
|
||
|
||
for (l = mep_hi_fixup_list; l != NULL; l = l->next)
|
||
{
|
||
segment_info_type * seginfo;
|
||
int pass;
|
||
|
||
gas_assert (FX_OPINFO_R_TYPE (l->fixp) == BFD_RELOC_HI16
|
||
|| FX_OPINFO_R_TYPE (l->fixp) == BFD_RELOC_LO16);
|
||
|
||
/* Check quickly whether the next fixup happens to be a matching low. */
|
||
if (l->fixp->fx_next != NULL
|
||
&& FX_OPINFO_R_TYPE (l->fixp->fx_next) == BFD_RELOC_LO16
|
||
&& l->fixp->fx_addsy == l->fixp->fx_next->fx_addsy
|
||
&& l->fixp->fx_offset == l->fixp->fx_next->fx_offset)
|
||
continue;
|
||
|
||
/* Look through the fixups for this segment for a matching
|
||
`low'. When we find one, move the high just in front of it.
|
||
We do this in two passes. In the first pass, we try to find
|
||
a unique `low'. In the second pass, we permit multiple
|
||
high's relocs for a single `low'. */
|
||
seginfo = seg_info (l->seg);
|
||
for (pass = 0; pass < 2; pass++)
|
||
{
|
||
fixS * f;
|
||
fixS * prev;
|
||
|
||
prev = NULL;
|
||
for (f = seginfo->fix_root; f != NULL; f = f->fx_next)
|
||
{
|
||
/* Check whether this is a `low' fixup which matches l->fixp. */
|
||
if (FX_OPINFO_R_TYPE (f) == BFD_RELOC_LO16
|
||
&& f->fx_addsy == l->fixp->fx_addsy
|
||
&& f->fx_offset == l->fixp->fx_offset
|
||
&& (pass == 1
|
||
|| prev == NULL
|
||
|| (FX_OPINFO_R_TYPE (prev) != BFD_RELOC_HI16)
|
||
|| prev->fx_addsy != f->fx_addsy
|
||
|| prev->fx_offset != f->fx_offset))
|
||
{
|
||
fixS ** pf;
|
||
|
||
/* Move l->fixp before f. */
|
||
for (pf = &seginfo->fix_root;
|
||
* pf != l->fixp;
|
||
pf = & (* pf)->fx_next)
|
||
gas_assert (* pf != NULL);
|
||
|
||
* pf = l->fixp->fx_next;
|
||
|
||
l->fixp->fx_next = f;
|
||
if (prev == NULL)
|
||
seginfo->fix_root = l->fixp;
|
||
else
|
||
prev->fx_next = l->fixp;
|
||
|
||
break;
|
||
}
|
||
|
||
prev = f;
|
||
}
|
||
|
||
if (f != NULL)
|
||
break;
|
||
|
||
if (pass == 1)
|
||
as_warn_where (l->fixp->fx_file, l->fixp->fx_line,
|
||
_("Unmatched high relocation"));
|
||
}
|
||
}
|
||
}
|
||
|
||
/* See whether we need to force a relocation into the output file. */
|
||
|
||
int
|
||
mep_force_relocation (fixS *fixp)
|
||
{
|
||
if ( fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT
|
||
|| fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
|
||
return 1;
|
||
|
||
if (generic_force_reloc (fixp))
|
||
return 1;
|
||
|
||
/* Allow branches to global symbols to be resolved at assembly time.
|
||
This is consistent with way relaxable branches are handled, since
|
||
branches to both global and local symbols are relaxed. It also
|
||
corresponds to the assumptions made in md_pcrel_from_section. */
|
||
return S_FORCE_RELOC (fixp->fx_addsy, !fixp->fx_pcrel);
|
||
}
|
||
|
||
/* Write a value out to the object file, using the appropriate endianness. */
|
||
|
||
void
|
||
md_number_to_chars (char *buf, valueT val, int n)
|
||
{
|
||
if (target_big_endian)
|
||
number_to_chars_bigendian (buf, val, n);
|
||
else
|
||
number_to_chars_littleendian (buf, val, n);
|
||
}
|
||
|
||
char *
|
||
md_atof (int type, char *litP, int *sizeP)
|
||
{
|
||
return ieee_md_atof (type, litP, sizeP, TRUE);
|
||
}
|
||
|
||
bfd_boolean
|
||
mep_fix_adjustable (fixS *fixP)
|
||
{
|
||
bfd_reloc_code_real_type reloc_type;
|
||
|
||
if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED)
|
||
{
|
||
const CGEN_INSN *insn = NULL;
|
||
int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED;
|
||
const CGEN_OPERAND *operand
|
||
= cgen_operand_lookup_by_num(gas_cgen_cpu_desc, opindex);
|
||
reloc_type = md_cgen_lookup_reloc (insn, operand, fixP);
|
||
}
|
||
else
|
||
reloc_type = fixP->fx_r_type;
|
||
|
||
if (fixP->fx_addsy == NULL)
|
||
return 1;
|
||
|
||
/* Prevent all adjustments to global symbols. */
|
||
if (S_IS_EXTERNAL (fixP->fx_addsy))
|
||
return 0;
|
||
|
||
if (S_IS_WEAK (fixP->fx_addsy))
|
||
return 0;
|
||
|
||
/* We need the symbol name for the VTABLE entries */
|
||
if (reloc_type == BFD_RELOC_VTABLE_INHERIT
|
||
|| reloc_type == BFD_RELOC_VTABLE_ENTRY)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
bfd_vma
|
||
mep_elf_section_letter (int letter, char **ptrmsg)
|
||
{
|
||
if (letter == 'v')
|
||
return SHF_MEP_VLIW;
|
||
|
||
*ptrmsg = _("bad .section directive: want a,v,w,x,M,S in string");
|
||
return -1;
|
||
}
|
||
|
||
flagword
|
||
mep_elf_section_flags (flagword flags, bfd_vma attr, int type ATTRIBUTE_UNUSED)
|
||
{
|
||
if (attr & SHF_MEP_VLIW)
|
||
flags |= SEC_MEP_VLIW;
|
||
return flags;
|
||
}
|
||
|
||
/* In vliw mode, the default section is .vtext. We have to be able
|
||
to switch into .vtext using only the .vtext directive. */
|
||
|
||
static segT
|
||
mep_vtext_section (void)
|
||
{
|
||
static segT vtext_section;
|
||
|
||
if (! vtext_section)
|
||
{
|
||
flagword applicable = bfd_applicable_section_flags (stdoutput);
|
||
vtext_section = subseg_new (VTEXT_SECTION_NAME, 0);
|
||
bfd_set_section_flags (stdoutput, vtext_section,
|
||
applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
|
||
| SEC_CODE | SEC_READONLY
|
||
| SEC_MEP_VLIW));
|
||
}
|
||
|
||
return vtext_section;
|
||
}
|
||
|
||
static void
|
||
mep_s_vtext (int ignore ATTRIBUTE_UNUSED)
|
||
{
|
||
int temp;
|
||
|
||
/* Record previous_section and previous_subsection. */
|
||
obj_elf_section_change_hook ();
|
||
|
||
temp = get_absolute_expression ();
|
||
subseg_set (mep_vtext_section (), (subsegT) temp);
|
||
demand_empty_rest_of_line ();
|
||
}
|
||
|
||
static void
|
||
mep_switch_to_core_mode (int dummy ATTRIBUTE_UNUSED)
|
||
{
|
||
mep_process_saved_insns ();
|
||
pluspresent = 0;
|
||
mode = CORE;
|
||
}
|
||
|
||
static void
|
||
mep_switch_to_vliw_mode (int dummy ATTRIBUTE_UNUSED)
|
||
{
|
||
if (! MEP_VLIW)
|
||
as_bad (_(".vliw unavailable when VLIW is disabled."));
|
||
mode = VLIW;
|
||
/* Switch into .vtext here too. */
|
||
/* mep_s_vtext(); */
|
||
}
|
||
|
||
/* This is an undocumented pseudo-op used to disable gas's
|
||
"disabled_registers" check. Used for code which checks for those
|
||
registers at runtime. */
|
||
static void
|
||
mep_noregerr (int i ATTRIBUTE_UNUSED)
|
||
{
|
||
allow_disabled_registers = 1;
|
||
}
|
||
|
||
/* mep_unrecognized_line: This is called when a line that can't be parsed
|
||
is encountered. We use it to check for a leading '+' sign which indicates
|
||
that the current instruction is a coprocessor instruction that is to be
|
||
parallelized with a previous core insn. This function accepts the '+' and
|
||
rejects all other characters that might indicate garbage at the beginning
|
||
of the line. The '+' character gets lost as the calling loop continues,
|
||
so we need to indicate that we saw it. */
|
||
|
||
int
|
||
mep_unrecognized_line (int ch)
|
||
{
|
||
switch (ch)
|
||
{
|
||
case '+':
|
||
pluspresent = 1;
|
||
return 1; /* '+' indicates an instruction to be parallelized. */
|
||
default:
|
||
return 0; /* If it's not a '+', the line can't be parsed. */
|
||
}
|
||
}
|
||
|
||
void
|
||
mep_cleanup (void)
|
||
{
|
||
/* Take care of any insns left to be parallelized when the file ends.
|
||
This is mainly here to handle the case where the file ends with an
|
||
insn preceeded by a + or the file ends unexpectedly. */
|
||
if (mode == VLIW)
|
||
mep_process_saved_insns ();
|
||
}
|
||
|
||
int
|
||
mep_flush_pending_output (void)
|
||
{
|
||
if (mode == VLIW)
|
||
{
|
||
mep_process_saved_insns ();
|
||
pluspresent = 0;
|
||
}
|
||
|
||
return 1;
|
||
}
|