337 lines
7.0 KiB
C
337 lines
7.0 KiB
C
/* Support code for various pieces of CGEN simulators.
|
||
Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
|
||
Contributed by Cygnus Support.
|
||
|
||
This file is part of GDB, the GNU debugger.
|
||
|
||
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, 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 "sim-main.h"
|
||
#include "dis-asm.h"
|
||
#include "cpu-opc.h"
|
||
|
||
#define MEMOPS_DEFINE_INLINE
|
||
#include "cgen-mem.h"
|
||
|
||
#define SEMOPS_DEFINE_INLINE
|
||
#include "cgen-ops.h"
|
||
|
||
const char *mode_names[] = {
|
||
"VM",
|
||
"BI",
|
||
"QI",
|
||
"HI",
|
||
"SI",
|
||
"DI",
|
||
"UBI",
|
||
"UQI",
|
||
"UHI",
|
||
"USI",
|
||
"UDI",
|
||
"SF",
|
||
"DF",
|
||
"XF",
|
||
"TF",
|
||
};
|
||
|
||
/* Initialize cgen things.
|
||
This is called after sim_post_argv_init. */
|
||
|
||
void
|
||
cgen_init (SIM_DESC sd)
|
||
{
|
||
int i, c;
|
||
int run_fast_p = 1;
|
||
|
||
/* If no profiling or tracing has been enabled, run in fast mode. */
|
||
for (c = 0; c < MAX_NR_PROCESSORS; ++c)
|
||
{
|
||
sim_cpu *cpu = STATE_CPU (sd, c);
|
||
|
||
for (i = 0; i < MAX_PROFILE_VALUES; ++i)
|
||
if (CPU_PROFILE_FLAGS (cpu) [i])
|
||
{
|
||
run_fast_p = 0;
|
||
break;
|
||
}
|
||
for (i = 0; i < MAX_TRACE_VALUES; ++i)
|
||
if (CPU_TRACE_FLAGS (cpu) [i])
|
||
{
|
||
run_fast_p = 0;
|
||
break;
|
||
}
|
||
if (! run_fast_p)
|
||
break;
|
||
}
|
||
STATE_RUN_FAST_P (sd) = run_fast_p;
|
||
}
|
||
|
||
/* Disassembly support.
|
||
??? While executing an instruction, the insn has been decoded and all its
|
||
fields have been extracted. It is certainly possible to do the disassembly
|
||
with that data. This seems simpler, but maybe in the future the already
|
||
extracted fields will be used. */
|
||
|
||
/* Pseudo FILE object for strings. */
|
||
typedef struct {
|
||
char *buffer;
|
||
char *current;
|
||
} SFILE;
|
||
|
||
/* sprintf to a "stream" */
|
||
|
||
static int
|
||
disasm_sprintf VPARAMS ((SFILE *f, const char *format, ...))
|
||
{
|
||
#ifndef __STDC__
|
||
SFILE *f;
|
||
const char *format;
|
||
#endif
|
||
int n;
|
||
va_list args;
|
||
|
||
VA_START (args, format);
|
||
#ifndef __STDC__
|
||
f = va_arg (args, SFILE *);
|
||
format = va_arg (args, char *);
|
||
#endif
|
||
vsprintf (f->current, format, args);
|
||
f->current += n = strlen (f->current);
|
||
va_end (args);
|
||
return n;
|
||
}
|
||
|
||
void
|
||
sim_disassemble_insn (SIM_CPU *cpu, const struct cgen_insn *insn,
|
||
const struct argbuf *abuf, PCADDR pc, char *buf)
|
||
{
|
||
unsigned int length;
|
||
unsigned long insn_value;
|
||
struct disassemble_info disasm_info;
|
||
struct cgen_fields fields;
|
||
SFILE sfile;
|
||
union {
|
||
unsigned8 bytes[16];
|
||
unsigned16 shorts[8];
|
||
unsigned32 words[4];
|
||
} insn_buf;
|
||
SIM_DESC sd = CPU_STATE (cpu);
|
||
|
||
sfile.buffer = sfile.current = buf;
|
||
INIT_DISASSEMBLE_INFO (disasm_info, (FILE *) &sfile,
|
||
(fprintf_ftype) disasm_sprintf);
|
||
disasm_info.endian =
|
||
(bfd_big_endian (STATE_PROG_BFD (sd)) ? BFD_ENDIAN_BIG
|
||
: bfd_little_endian (STATE_PROG_BFD (sd)) ? BFD_ENDIAN_LITTLE
|
||
: BFD_ENDIAN_UNKNOWN);
|
||
|
||
length = sim_core_read_buffer (sd, cpu, sim_core_read_map, &insn_buf, pc,
|
||
CGEN_INSN_BITSIZE (insn) / 8);
|
||
|
||
switch (length)
|
||
{
|
||
case 1 : insn_value = insn_buf.bytes[0]; break;
|
||
case 2 : insn_value = T2H_2 (insn_buf.shorts[0]); break;
|
||
case 4 : insn_value = T2H_4 (insn_buf.words[0]); break;
|
||
default: abort ();
|
||
}
|
||
|
||
length = (*CGEN_EXTRACT_FN (insn)) (insn, NULL, insn_value, &fields);
|
||
/* Result of extract fn is in bits. */
|
||
/* ??? This assumes that each instruction has a fixed length (and thus
|
||
for insns with multiple versions of variable lengths they would each
|
||
have their own table entry). */
|
||
if (length == CGEN_INSN_BITSIZE (insn))
|
||
{
|
||
(*CGEN_PRINT_FN (insn)) (&disasm_info, insn, &fields, pc, length);
|
||
}
|
||
else
|
||
{
|
||
/* This shouldn't happen, but aborting is too drastic. */
|
||
strcpy (buf, "***unknown***");
|
||
}
|
||
}
|
||
|
||
#ifdef DI_FN_SUPPORT
|
||
|
||
DI
|
||
make_struct_di (hi, lo)
|
||
SI hi, lo;
|
||
{
|
||
DI result;
|
||
|
||
result.hi = hi;
|
||
result.lo = lo;
|
||
return result;
|
||
}
|
||
|
||
DI
|
||
ANDDI (a, b)
|
||
DI a, b;
|
||
{
|
||
SI ahi = GETHIDI (a);
|
||
SI alo = GETLODI (a);
|
||
SI bhi = GETHIDI (b);
|
||
SI blo = GETLODI (b);
|
||
return MAKEDI (ahi & bhi, alo & blo);
|
||
}
|
||
|
||
DI
|
||
ORDI (a, b)
|
||
DI a, b;
|
||
{
|
||
SI ahi = GETHIDI (a);
|
||
SI alo = GETLODI (a);
|
||
SI bhi = GETHIDI (b);
|
||
SI blo = GETLODI (b);
|
||
return MAKEDI (ahi | bhi, alo | blo);
|
||
}
|
||
|
||
DI
|
||
ADDDI (a, b)
|
||
DI a, b;
|
||
{
|
||
USI ahi = GETHIDI (a);
|
||
USI alo = GETLODI (a);
|
||
USI bhi = GETHIDI (b);
|
||
USI blo = GETLODI (b);
|
||
USI x = alo + blo;
|
||
return MAKEDI (ahi + bhi + (x < alo), x);
|
||
}
|
||
|
||
DI
|
||
MULDI (a, b)
|
||
DI a, b;
|
||
{
|
||
USI ahi = GETHIDI (a);
|
||
USI alo = GETLODI (a);
|
||
USI bhi = GETHIDI (b);
|
||
USI blo = GETLODI (b);
|
||
USI rhi,rlo;
|
||
USI x0, x1, x2, x3;
|
||
|
||
x0 = alo * blo;
|
||
x1 = alo * bhi;
|
||
x2 = ahi * blo;
|
||
x3 = ahi * bhi;
|
||
|
||
#define SI_TYPE_SIZE 32
|
||
#define BITS4 (SI_TYPE_SIZE / 4)
|
||
#define ll_B (1L << (SI_TYPE_SIZE / 2))
|
||
#define ll_lowpart(t) ((USI) (t) % ll_B)
|
||
#define ll_highpart(t) ((USI) (t) / ll_B)
|
||
x1 += ll_highpart (x0); /* this can't give carry */
|
||
x1 += x2; /* but this indeed can */
|
||
if (x1 < x2) /* did we get it? */
|
||
x3 += ll_B; /* yes, add it in the proper pos. */
|
||
|
||
rhi = x3 + ll_highpart (x1);
|
||
rlo = ll_lowpart (x1) * ll_B + ll_lowpart (x0);
|
||
return MAKEDI (rhi + (alo * bhi) + (ahi * blo), rlo);
|
||
}
|
||
|
||
DI
|
||
SHLDI (val, shift)
|
||
DI val;
|
||
SI shift;
|
||
{
|
||
USI hi = GETHIDI (val);
|
||
USI lo = GETLODI (val);
|
||
/* FIXME: Need to worry about shift < 0 || shift >= 32. */
|
||
return MAKEDI ((hi << shift) | (lo >> (32 - shift)), lo << shift);
|
||
}
|
||
|
||
DI
|
||
SLADI (val, shift)
|
||
DI val;
|
||
SI shift;
|
||
{
|
||
SI hi = GETHIDI (val);
|
||
USI lo = GETLODI (val);
|
||
/* FIXME: Need to worry about shift < 0 || shift >= 32. */
|
||
return MAKEDI ((hi << shift) | (lo >> (32 - shift)), lo << shift);
|
||
}
|
||
|
||
DI
|
||
SRADI (val, shift)
|
||
DI val;
|
||
SI shift;
|
||
{
|
||
SI hi = GETHIDI (val);
|
||
USI lo = GETLODI (val);
|
||
/* We use SRASI because the result is implementation defined if hi < 0. */
|
||
/* FIXME: Need to worry about shift < 0 || shift >= 32. */
|
||
return MAKEDI (SRASI (hi, shift), (hi << (32 - shift)) | (lo >> shift));
|
||
}
|
||
|
||
int
|
||
GEDI (a, b)
|
||
DI a, b;
|
||
{
|
||
SI ahi = GETHIDI (a);
|
||
USI alo = GETLODI (a);
|
||
SI bhi = GETHIDI (b);
|
||
USI blo = GETLODI (b);
|
||
if (ahi > bhi)
|
||
return 1;
|
||
if (ahi == bhi)
|
||
return alo >= blo;
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
LEDI (a, b)
|
||
DI a, b;
|
||
{
|
||
SI ahi = GETHIDI (a);
|
||
USI alo = GETLODI (a);
|
||
SI bhi = GETHIDI (b);
|
||
USI blo = GETLODI (b);
|
||
if (ahi < bhi)
|
||
return 1;
|
||
if (ahi == bhi)
|
||
return alo <= blo;
|
||
return 0;
|
||
}
|
||
|
||
DI
|
||
CONVHIDI (val)
|
||
HI val;
|
||
{
|
||
if (val < 0)
|
||
return MAKEDI (-1, val);
|
||
else
|
||
return MAKEDI (0, val);
|
||
}
|
||
|
||
DI
|
||
CONVSIDI (val)
|
||
SI val;
|
||
{
|
||
if (val < 0)
|
||
return MAKEDI (-1, val);
|
||
else
|
||
return MAKEDI (0, val);
|
||
}
|
||
|
||
SI
|
||
CONVDISI (val)
|
||
DI val;
|
||
{
|
||
return GETLODI (val);
|
||
}
|
||
|
||
#endif /* DI_FN_SUPPORT */
|