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binutils-gdb/sim/m32c/reg.c
Mike Frysinger 269e9c185f sim: m32c: enable warnings & clean up a bunch 
This doesn't clean up all the warnings, just most of them.
The ones that are left will require some care to unravel.
2015-04-01 02:22:58 -04:00

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/* reg.c --- register set model for M32C simulator.
Copyright (C) 2005-2015 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cpu.h"
int verbose = 0;
int trace = 0;
int enable_counting = 0;
int in_gdb = 1;
regs_type regs;
int addr_mask = 0xffff;
int membus_mask = 0xfffff;
int m32c_cpu = 0;
int step_result;
unsigned int heapbottom = 0;
unsigned int heaptop = 0;
char *reg_names[] = {
"mem",
"r0", "r0h", "r0l",
"r1", "r1h", "r1l",
"r2", "r2r0",
"r3", "r3r1",
"r3r1r2r0",
"r3r2r1r0",
"a0",
"a1", "a1a0",
"sb", "fb",
"intb", "intbl", "intbh",
"sp", "usp", "isp", "pc", "flags"
};
int reg_bytes[] = {
0,
2, 1, 1,
2, 1, 1,
2, 4,
2, 4,
8,
8,
2,
2, 4,
2, 2,
2, 1, 3,
2, 2, 2, 3, 2
};
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;
int m32c_opcode_pc;
void
init_regs (void)
{
memset (&regs, 0, sizeof (regs));
memset (&oldregs, 0, sizeof (oldregs));
}
void
set_pointer_width (int bytes)
{
if (bytes == 2)
{
addr_mask = 0xffff;
membus_mask = 0x000fffff;
reg_bytes[a0] = reg_bytes[a1] = reg_bytes[sb] = reg_bytes[fb] =
reg_bytes[sp] = reg_bytes[usp] = reg_bytes[isp] = 2;
}
else
{
addr_mask = 0xffffff;
membus_mask = 0x00ffffff;
reg_bytes[a0] = reg_bytes[a1] = reg_bytes[sb] = reg_bytes[fb] =
reg_bytes[sp] = reg_bytes[usp] = reg_bytes[isp] = 3;
}
}
void
m32c_set_cpu (int cpu)
{
switch (cpu)
{
case CPU_R8C:
case CPU_M16C:
set_pointer_width (2);
decode_opcode = decode_r8c;
break;
case CPU_M32CM:
case CPU_M32C:
set_pointer_width (3);
decode_opcode = decode_m32c;
break;
default:
abort ();
}
m32c_cpu = cpu;
}
static unsigned int
get_reg_i (reg_id id)
{
reg_bank_type *b = regs.r + (FLAG_B ? 1 : 0);
switch (id)
{
case r0:
return b->r_r0;
case r0h:
return b->r_r0 >> 8;
case r0l:
return b->r_r0 & 0xff;
case r1:
return b->r_r1;
case r1h:
return b->r_r1 >> 8;
case r1l:
return b->r_r1 & 0xff;
case r2:
return b->r_r2;
case r2r0:
return b->r_r2 * 65536 + b->r_r0;
case r3:
return b->r_r3;
case r3r1:
return b->r_r3 * 65536 + b->r_r1;
case a0:
return b->r_a0 & addr_mask;
case a1:
return b->r_a1 & addr_mask;
case a1a0:
return (b->r_a1 & 0xffff) * 65536 | (b->r_a0 & 0xffff);
case sb:
return b->r_sb & addr_mask;
case fb:
return b->r_fb & addr_mask;
case intb:
return regs.r_intbh * 65536 + regs.r_intbl;
case intbl:
return regs.r_intbl;
case intbh:
return regs.r_intbh;
case sp:
return ((regs.r_flags & FLAGBIT_U) ? regs.r_usp : regs.
r_isp) & addr_mask;
case usp:
return regs.r_usp & addr_mask;
case isp:
return regs.r_isp & addr_mask;
case pc:
return regs.r_pc & membus_mask;
case flags:
return regs.r_flags;
default:
abort ();
}
}
unsigned int
get_reg (reg_id id)
{
unsigned int rv = get_reg_i (id);
if (trace > ((id != pc && id != fb && id != sp) ? 0 : 1))
printf ("get_reg (%s) = %0*x\n", reg_names[id], reg_bytes[id] * 2, rv);
return rv;
}
DI
get_reg_ll (reg_id id)
{
reg_bank_type *b = regs.r + (FLAG_B ? 1 : 0);
switch (id)
{
case r3r1r2r0:
return ((DI) b->r_r3 << 48
| (DI) b->r_r1 << 32 | (DI) b->r_r2 << 16 | (DI) b->r_r0);
case r3r2r1r0:
return ((DI) b->r_r3 << 48
| (DI) b->r_r2 << 32 | (DI) b->r_r1 << 16 | (DI) b->r_r0);
default:
return get_reg (id);
}
}
static int highest_sp = 0, lowest_sp = 0xffffff;
void
stack_heap_stats (void)
{
printf ("heap: %08x - %08x (%d bytes)\n", heapbottom, heaptop,
heaptop - heapbottom);
printf ("stack: %08x - %08x (%d bytes)\n", lowest_sp, highest_sp,
highest_sp - lowest_sp);
}
void
put_reg (reg_id id, unsigned int v)
{
reg_bank_type *b = regs.r + (FLAG_B ? 1 : 0);
if (trace > ((id != pc) ? 0 : 1))
printf ("put_reg (%s) = %0*x\n", reg_names[id], reg_bytes[id] * 2, v);
switch (id)
{
case r0:
b->r_r0 = v;
break;
case r0h:
b->r_r0 = (b->r_r0 & 0xff) | (v << 8);
break;
case r0l:
b->r_r0 = (b->r_r0 & 0xff00) | (v & 0xff);
break;
case r1:
b->r_r1 = v;
break;
case r1h:
b->r_r1 = (b->r_r1 & 0xff) | (v << 8);
break;
case r1l:
b->r_r1 = (b->r_r1 & 0xff00) | (v & 0xff);
break;
case r2:
b->r_r2 = v;
break;
case r2r0:
b->r_r0 = v & 0xffff;
b->r_r2 = v >> 16;
break;
case r3:
b->r_r3 = v;
break;
case r3r1:
b->r_r1 = v & 0xffff;
b->r_r3 = v >> 16;
break;
case a0:
b->r_a0 = v & addr_mask;
break;
case a1:
b->r_a1 = v & addr_mask;
break;
case a1a0:
b->r_a0 = v & 0xffff;
b->r_a1 = v >> 16;
break;
case sb:
b->r_sb = v & addr_mask;
break;
case fb:
b->r_fb = v & addr_mask;
break;
case intb:
regs.r_intbl = v & 0xffff;
regs.r_intbh = v >> 16;
break;
case intbl:
regs.r_intbl = v & 0xffff;
break;
case intbh:
regs.r_intbh = v & 0xff;
break;
case sp:
{
SI *spp;
if (regs.r_flags & FLAGBIT_U)
spp = &regs.r_usp;
else
spp = &regs.r_isp;
*spp = v & addr_mask;
if (*spp < heaptop)
{
printf ("collision: pc %08lx heap %08x stack %08lx\n", regs.r_pc,
heaptop, *spp);
exit (1);
}
if (*spp < lowest_sp)
lowest_sp = *spp;
if (*spp > highest_sp)
highest_sp = *spp;
break;
}
case usp:
regs.r_usp = v & addr_mask;
break;
case isp:
regs.r_isp = v & addr_mask;
break;
case pc:
regs.r_pc = v & membus_mask;
break;
case flags:
regs.r_flags = v;
break;
default:
abort ();
}
}
int
condition_true (int cond_id)
{
int f;
if (A16)
{
static const char *cond_name[] = {
"C", "C&!Z", "Z", "S",
"!C", "!(C&!Z)", "!Z", "!S",
"(S^O)|Z", "O", "!(S^O)", "unk",
"!((S^O)|Z)", "!O", "S^O", "unk"
};
switch (cond_id & 15)
{
case 0:
f = FLAG_C;
break; /* GEU/C */
case 1:
f = FLAG_C & !FLAG_Z;
break; /* GTU */
case 2:
f = FLAG_Z;
break; /* EQ/Z */
case 3:
f = FLAG_S;
break; /* N */
case 4:
f = !FLAG_C;
break; /* LTU/NC */
case 5:
f = !(FLAG_C & !FLAG_Z);
break; /* LEU */
case 6:
f = !FLAG_Z;
break; /* NE/NZ */
case 7:
f = !FLAG_S;
break; /* PZ */
case 8:
f = (FLAG_S ^ FLAG_O) | FLAG_Z;
break; /* LE */
case 9:
f = FLAG_O;
break; /* O */
case 10:
f = !(FLAG_S ^ FLAG_O);
break; /* GE */
case 12:
f = !((FLAG_S ^ FLAG_O) | FLAG_Z);
break; /* GT */
case 13:
f = !FLAG_O;
break; /* NO */
case 14:
f = FLAG_S ^ FLAG_O;
break; /* LT */
default:
f = 0;
break;
}
if (trace)
printf ("cond[%d] %s = %s\n", cond_id, cond_name[cond_id & 15],
f ? "true" : "false");
}
else
{
static const char *cond_name[] = {
"!C", "LEU", "!Z", "PZ",
"!O", "GT", "GE", "?",
"C", "GTU", "Z", "N",
"O", "LE", "LT", "!?"
};
switch (cond_id & 15)
{
case 0:
f = !FLAG_C;
break; /* LTU/NC */
case 1:
f = !(FLAG_C & !FLAG_Z);
break; /* LEU */
case 2:
f = !FLAG_Z;
break; /* NE/NZ */
case 3:
f = !FLAG_S;
break; /* PZ */
case 4:
f = !FLAG_O;
break; /* NO */
case 5:
f = !((FLAG_S ^ FLAG_O) | FLAG_Z);
break; /* GT */
case 6:
f = !(FLAG_S ^ FLAG_O);
break; /* GE */
case 8:
f = FLAG_C;
break; /* GEU/C */
case 9:
f = FLAG_C & !FLAG_Z;
break; /* GTU */
case 10:
f = FLAG_Z;
break; /* EQ/Z */
case 11:
f = FLAG_S;
break; /* N */
case 12:
f = FLAG_O;
break; /* O */
case 13:
f = (FLAG_S ^ FLAG_O) | FLAG_Z;
break; /* LE */
case 14:
f = FLAG_S ^ FLAG_O;
break; /* LT */
default:
f = 0;
break;
}
if (trace)
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)
{
int i;
regs.r_flags &= ~mask;
regs.r_flags |= newbits & mask;
if (trace)
{
printf ("flags now \033[32m %d", (regs.r_flags >> (A16 ? 8 : 12)) & 7);
for (i = 7; i >= 0; i--)
if (regs.r_flags & (1 << i))
putchar ("CDZSBOIU"[i]);
else
putchar ('-');
printf ("\033[0m\n");
}
}
void
set_oszc (int value, int b, int c)
{
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 (int value, int b, int c)
{
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 (int value, int b)
{
int mask = b2mask[b];
int f = 0;
if ((value & mask) == 0)
f |= FLAGBIT_Z;
if (value & b2signbit[b])
f |= FLAGBIT_S;
if (value & ~mask && (value & ~mask) != ~mask)
f |= FLAGBIT_O;
set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_O, f);
}
void
set_sz (int value, int b)
{
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);
}
void
put_reg_ll (reg_id id, DI v)
{
reg_bank_type *b = regs.r + (FLAG_B ? 1 : 0);
switch (id)
{
case r3r1r2r0:
b->r_r3 = v >> 48;
b->r_r1 = v >> 32;
b->r_r2 = v >> 16;
b->r_r0 = v;
break;
case r3r2r1r0:
b->r_r3 = v >> 48;
b->r_r2 = v >> 32;
b->r_r1 = v >> 16;
b->r_r0 = v;
break;
default:
put_reg (id, v);
}
}
static void
print_flags (int f)
{
int i;
static char fn[] = "CDZSBOIU";
printf ("%d.", (f >> 12) & 7);
for (i = 7; i >= 0; i--)
if (f & (1 << i))
putchar (fn[i]);
}
#define TRC(f,n, id) \
if (oldregs.f != regs.f) \
{ \
printf(" %s %0*x:%0*x", n, \
reg_bytes[id]*2, (unsigned int)oldregs.f, \
reg_bytes[id]*2, (unsigned int)regs.f); \
oldregs.f = regs.f; \
}
void
trace_register_changes (void)
{
if (!trace)
return;
printf ("\033[36mREGS:");
TRC (r[0].r_r0, "r0", r0);
TRC (r[0].r_r1, "r1", r1);
TRC (r[0].r_r2, "r2", r2);
TRC (r[0].r_r3, "r3", r3);
TRC (r[0].r_a0, "a0", a0);
TRC (r[0].r_a1, "a1", a1);
TRC (r[0].r_sb, "sb", sb);
TRC (r[0].r_fb, "fb", fb);
TRC (r[1].r_r0, "r0'", r0);
TRC (r[1].r_r1, "r1'", r1);
TRC (r[1].r_r2, "r2'", r2);
TRC (r[1].r_r3, "r3'", r3);
TRC (r[1].r_a0, "a0'", a0);
TRC (r[1].r_a1, "a1'", a1);
TRC (r[1].r_sb, "sb'", sb);
TRC (r[1].r_fb, "fb'", fb);
TRC (r_intbh, "intbh", intbh);
TRC (r_intbl, "intbl", intbl);
TRC (r_usp, "usp", usp);
TRC (r_isp, "isp", isp);
TRC (r_pc, "pc", pc);
if (oldregs.r_flags != regs.r_flags)
{
printf (" flags ");
print_flags (oldregs.r_flags);
printf (":");
print_flags (regs.r_flags);
}
printf ("\033[0m\n");
}
#define DRC(f, n, id) \
printf(" %-3s %0*x", n, \
reg_bytes[id]*2, (unsigned int)regs.f); \
void
m32c_dump_all_registers (void)
{
printf ("\033[36mREGS:");
DRC (r[0].r_r0, "r0", r0);
DRC (r[0].r_r1, "r1", r1);
DRC (r[0].r_r2, "r2", r2);
DRC (r[0].r_r3, "r3", r3);
DRC (r[0].r_a0, "a0", a0);
DRC (r[0].r_a1, "a1", a1);
DRC (r[0].r_sb, "sb", sb);
DRC (r[0].r_fb, "fb", fb);
printf ("\n ");
DRC (r[1].r_r0, "r0'", r0);
DRC (r[1].r_r1, "r1'", r1);
DRC (r[1].r_r2, "r2'", r2);
DRC (r[1].r_r3, "r3'", r3);
DRC (r[1].r_a0, "a0'", a0);
DRC (r[1].r_a1, "a1'", a1);
DRC (r[1].r_sb, "sb'", sb);
DRC (r[1].r_fb, "fb'", fb);
printf (" \n");
DRC (r_intbh, "intbh", intbh);
DRC (r_intbl, "intbl", intbl);
DRC (r_usp, "usp", usp);
DRC (r_isp, "isp", isp);
DRC (r_pc, "pc", pc);
printf (" flags ");
print_flags (regs.r_flags);
printf ("\033[0m\n");
/*sim_disasm_one (); */
}
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