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binutils-gdb/sim/rx/reg.c

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/* reg.c --- register set model for RX simulator.
Copyright (C) 2005-2014 Free Software Foundation, Inc.
Contributed by Red Hat, Inc.
This file is part of the GNU simulators.
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, see <http://www.gnu.org/licenses/>. */
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cpu.h"
#include "bfd.h"
#include "trace.h"
int verbose = 0;
int trace = 0;
int enable_counting = 0;
int rx_in_gdb = 1;
int rx_flagmask;
int rx_flagand;
int rx_flagor;
int rx_big_endian;
regs_type regs;
int step_result;
unsigned int heapbottom = 0;
unsigned int heaptop = 0;
char *reg_names[] = {
/* general registers */
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
/* control register */
"psw", "pc", "usp", "fpsw", "RES", "RES", "RES", "RES",
"bpsw", "bpc", "isp", "fintv", "intb", "RES", "RES", "RES",
"RES", "RES", "RES", "RES", "RES", "RES", "RES", "RES",
"RES", "RES", "RES", "RES", "RES", "RES", "RES", "RES",
"temp", "acc", "acchi", "accmi", "acclo"
};
unsigned int b2mask[] = { 0, 0xff, 0xffff, 0xffffff, 0xffffffff };
unsigned int b2signbit[] = { 0, (1 << 7), (1 << 15), (1 << 24), (1 << 31) };
int b2maxsigned[] = { 0, 0x7f, 0x7fff, 0x7fffff, 0x7fffffff };
int b2minsigned[] = { 0, -128, -32768, -8388608, -2147483647 - 1 };
static regs_type oldregs;
void
init_regs (void)
{
memset (&regs, 0, sizeof (regs));
memset (&oldregs, 0, sizeof (oldregs));
#ifdef CYCLE_ACCURATE
regs.rt = -1;
oldregs.rt = -1;
#endif
}
static unsigned int
get_reg_i (int id)
{
if (id == 0)
return regs.r_psw & FLAGBIT_U ? regs.r_usp : regs.r_isp;
if (id >= 1 && id <= 15)
return regs.r[id];
switch (id)
{
case psw:
return regs.r_psw;
case fpsw:
return regs.r_fpsw;
case isp:
return regs.r_isp;
case usp:
return regs.r_usp;
case bpc:
return regs.r_bpc;
case bpsw:
return regs.r_bpsw;
case fintv:
return regs.r_fintv;
case intb:
return regs.r_intb;
case pc:
return regs.r_pc;
case r_temp_idx:
return regs.r_temp;
case acchi:
return (SI)(regs.r_acc >> 32);
case accmi:
return (SI)(regs.r_acc >> 16);
case acclo:
return (SI)regs.r_acc;
}
abort();
}
unsigned int
get_reg (int id)
{
unsigned int rv = get_reg_i (id);
if (trace > ((id != pc && id != sp) ? 0 : 1))
printf ("get_reg (%s) = %08x\n", reg_names[id], rv);
return rv;
}
static unsigned long long
get_reg64_i (int id)
{
switch (id)
{
case acc64:
return regs.r_acc;
default:
abort ();
}
}
unsigned long long
get_reg64 (int id)
{
unsigned long long rv = get_reg64_i (id);
if (trace > ((id != pc && id != sp) ? 0 : 1))
printf ("get_reg (%s) = %016llx\n", reg_names[id], rv);
return rv;
}
static int highest_sp = 0, lowest_sp = 0xffffff;
void
stack_heap_stats ()
{
if (heapbottom < heaptop)
printf ("heap: %08x - %08x (%d bytes)\n", heapbottom, heaptop,
heaptop - heapbottom);
if (lowest_sp < highest_sp)
printf ("stack: %08x - %08x (%d bytes)\n", lowest_sp, highest_sp,
highest_sp - lowest_sp);
}
void
put_reg (int id, unsigned int v)
{
if (trace > ((id != pc) ? 0 : 1))
printf ("put_reg (%s) = %08x\n", reg_names[id], v);
switch (id)
{
case psw:
regs.r_psw = v;
break;
case fpsw:
{
SI anded;
/* This is an odd one - The Cx flags are AND'd, and the FS flag
is synthetic. */
anded = regs.r_fpsw & v;
anded |= ~ FPSWBITS_CMASK;
regs.r_fpsw = v & anded;
if (regs.r_fpsw & FPSWBITS_FMASK)
regs.r_fpsw |= FPSWBITS_FSUM;
else
regs.r_fpsw &= ~FPSWBITS_FSUM;
}
break;
case isp:
regs.r_isp = v;
break;
case usp:
regs.r_usp = v;
break;
case bpc:
regs.r_bpc = v;
break;
case bpsw:
regs.r_bpsw = v;
break;
case fintv:
regs.r_fintv = v;
break;
case intb:
regs.r_intb = v;
break;
case pc:
regs.r_pc = v;
break;
case acchi:
regs.r_acc = (regs.r_acc & 0xffffffffULL) | ((DI)v << 32);
break;
case accmi:
regs.r_acc = (regs.r_acc & ~0xffffffff0000ULL) | ((DI)v << 16);
break;
case acclo:
regs.r_acc = (regs.r_acc & ~0xffffffffULL) | ((DI)v);
break;
case 0: /* Stack pointer is "in" R0. */
{
if (v < heaptop)
{
unsigned int line;
const char * dummy;
const char * fname = NULL;
sim_get_current_source_location (& dummy, & fname, &line);
/* The setjmp and longjmp functions play tricks with the stack pointer. */
if (fname == NULL
|| (strcmp (fname, "_setjmp") != 0
&& strcmp (fname, "_longjmp") != 0))
{
printf ("collision in %s: pc %08x heap %08x stack %08x\n",
fname, (unsigned int) regs.r_pc, heaptop, v);
exit (1);
}
}
else
{
if (v < lowest_sp)
lowest_sp = v;
if (v > highest_sp)
highest_sp = v;
}
if (regs.r_psw & FLAGBIT_U)
regs.r_usp = v;
else
regs.r_isp = v;
break;
}
default:
if (id >= 1 || id <= 15)
regs.r[id] = v;
else
abort ();
}
}
void
put_reg64 (int id, unsigned long long v)
{
if (trace > ((id != pc) ? 0 : 1))
printf ("put_reg (%s) = %016llx\n", reg_names[id], v);
switch (id)
{
case acc64:
regs.r_acc = v;
break;
default:
abort ();
}
}
int
condition_true (int cond_id)
{
int f;
static const char *cond_name[] = {
"Z",
"!Z",
"C",
"!C",
"C&!Z",
"!(C&!Z)",
"!S",
"S",
"!(S^O)",
"S^O",
"!((S^O)|Z)",
"(S^O)|Z",
"O",
"!O",
"always",
"never"
};
switch (cond_id & 15)
{
case 0:
f = FLAG_Z;
break; /* EQ/Z */
case 1:
f = !FLAG_Z;
break; /* NE/NZ */
case 2:
f = FLAG_C;
break; /* GEU/C */
case 3:
f = !FLAG_C;
break; /* LTU/NC */
case 4:
f = FLAG_C & !FLAG_Z;
break; /* GTU */
case 5:
f = !(FLAG_C & !FLAG_Z);
break; /* LEU */
case 6:
f = !FLAG_S;
break; /* PZ */
case 7:
f = FLAG_S;
break; /* N */
case 8:
f = !(FLAG_S ^ FLAG_O);
break; /* GE */
case 9:
f = FLAG_S ^ FLAG_O;
break; /* LT */
case 10:
f = !((FLAG_S ^ FLAG_O) | FLAG_Z);
break; /* GT */
case 11:
f = (FLAG_S ^ FLAG_O) | FLAG_Z;
break; /* LE */
case 12:
f = FLAG_O;
break; /* O */
case 13:
f = !FLAG_O;
break; /* NO */
case 14:
f = 1; /* always */
break;
default:
f = 0; /* never */
break;
}
if (trace && ((cond_id & 15) != 14))
printf ("cond[%d] %s = %s\n", cond_id, cond_name[cond_id & 15],
f ? "true" : "false");
return f;
}
void
set_flags (int mask, int newbits)
{
regs.r_psw &= rx_flagand;
regs.r_psw |= rx_flagor;
regs.r_psw |= (newbits & mask & rx_flagmask);
if (trace)
{
int i;
printf ("flags now \033[32m %d", (int)((regs.r_psw >> 24) & 7));
for (i = 17; i >= 0; i--)
if (0x3000f & (1 << i))
{
if (regs.r_psw & (1 << i))
putchar ("CZSO------------IU"[i]);
else
putchar ('-');
}
printf ("\033[0m\n");
}
}
void
set_oszc (long long value, int b, int c)
{
unsigned int mask = b2mask[b];
int f = 0;
if (c)
f |= FLAGBIT_C;
if ((value & mask) == 0)
f |= FLAGBIT_Z;
if (value & b2signbit[b])
f |= FLAGBIT_S;
if ((value > b2maxsigned[b]) || (value < b2minsigned[b]))
f |= FLAGBIT_O;
set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_O | FLAGBIT_C, f);
}
void
set_szc (long long value, int b, int c)
{
unsigned int mask = b2mask[b];
int f = 0;
if (c)
f |= FLAGBIT_C;
if ((value & mask) == 0)
f |= FLAGBIT_Z;
if (value & b2signbit[b])
f |= FLAGBIT_S;
set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_C, f);
}
void
set_osz (long long value, int b)
{
unsigned int mask = b2mask[b];
int f = 0;
if ((value & mask) == 0)
f |= FLAGBIT_Z;
if (value & b2signbit[b])
f |= FLAGBIT_S;
if ((value > b2maxsigned[b]) || (value < b2minsigned[b]))
f |= FLAGBIT_O;
set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_O, f);
}
void
set_sz (long long value, int b)
{
unsigned int mask = b2mask[b];
int f = 0;
if ((value & mask) == 0)
f |= FLAGBIT_Z;
if (value & b2signbit[b])
f |= FLAGBIT_S;
set_flags (FLAGBIT_Z | FLAGBIT_S, f);
}
void
set_zc (int z, int c)
{
set_flags (FLAGBIT_C | FLAGBIT_Z,
(c ? FLAGBIT_C : 0) | (z ? FLAGBIT_Z : 0));
}
void
set_c (int c)
{
set_flags (FLAGBIT_C, c ? FLAGBIT_C : 0);
}
static char *
psw2str(int rpsw)
{
static char buf[10];
char *bp = buf;
int i, ipl;
ipl = (rpsw & FLAGBITS_IPL) >> FLAGSHIFT_IPL;
if (ipl > 9)
{
*bp++ = (ipl / 10) + '0';
ipl %= 10;
}
*bp++ = ipl + '0';
for (i = 20; i >= 0; i--)
if (0x13000f & (1 << i))
{
if (rpsw & (1 << i))
*bp++ = "CZSO------------IU--P"[i];
else
*bp++ = '-';
}
*bp = 0;
return buf;
}
static char *
fpsw2str(int rpsw)
{
static char buf[100];
char *bp = buf;
int i; /* ---+---+---+---+---+---+---+---+ */
const char s1[] = "FFFFFF-----------EEEEE-DCCCCCCRR";
const char s2[] = "SXUZOV-----------XUZOV-NEXUZOV01";
const char rm[4][3] = { "RC", "RZ", "RP", "RN" };
for (i = 31; i >= 0; i--)
if (0xfc007dfc & (1 << i))
{
if (rpsw & (1 << i))
{
if (bp > buf)
*bp++ = '.';
*bp++ = s1[31-i];
*bp++ = s2[31-i];
}
}
if (bp > buf)
*bp++ = '.';
strcpy (bp, rm[rpsw&3]);
return buf;
}
#define TRC(f,n) \
if (oldregs.f != regs.f) \
{ \
if (tag) { printf (tag); tag = 0; } \
printf(" %s %08x:%08x", n, \
(unsigned int)oldregs.f, \
(unsigned int)regs.f); \
oldregs.f = regs.f; \
}
void
trace_register_changes (void)
{
char *tag = "\033[36mREGS:";
int i;
if (!trace)
return;
for (i=1; i<16; i++)
TRC (r[i], reg_names[i]);
TRC (r_intb, "intb");
TRC (r_usp, "usp");
TRC (r_isp, "isp");
if (oldregs.r_psw != regs.r_psw)
{
if (tag) { printf (tag); tag = 0; }
printf(" psw %s:", psw2str(oldregs.r_psw));
printf("%s", psw2str(regs.r_psw));
oldregs.r_psw = regs.r_psw;
}
if (oldregs.r_fpsw != regs.r_fpsw)
{
if (tag) { printf (tag); tag = 0; }
printf(" fpsw %s:", fpsw2str(oldregs.r_fpsw));
printf("%s", fpsw2str(regs.r_fpsw));
oldregs.r_fpsw = regs.r_fpsw;
}
if (oldregs.r_acc != regs.r_acc)
{
if (tag) { printf (tag); tag = 0; }
printf(" acc %016llx:", oldregs.r_acc);
printf("%016llx", regs.r_acc);
oldregs.r_acc = regs.r_acc;
}
if (tag == 0)
printf ("\033[0m\n");
}
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