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|
/* code generator for the Hitachi H8/300 architecture simulator.
Copyright (C) 1990-1991 Free Software Foundation, Inc.
Hacked by Steve Chamberlain of Cygnus Support.
This file is part of BFD, the Binary File Descriptor library.
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 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* This program reads the H8/300 opcode table and writes out
a large switch statement to understand the opcodes (with ifs if
there is more than one opcode per case) and code to do the stuff */
#include "bfd.h"
#include "sysdep.h"
#define DEFINE_TABLE
#define INSIM
#include"opcode/h8300.h"
#define MAXSAME 14
#define PTWO 256
static struct h8_opcode *h8_opcodes_sorted[PTWO][MAXSAME];
char *cs = "/*";
char *ce = "*/";
/* How to get at nibble n from the instruction */
char *nibs[] =
{
"foo",
"(b0&0xf)",
"((b1>>4)&0xf)",
"((b1)&0xf)",
"((pc[1]>>12)&0xf)",
"((pc[1]>>8)&0xf)",
"((pc[1]>>4)&0xf)",
"((pc[1])&0xf)",
0, 0};
/* how to get at the 3 bit immediate in the instruction */
char *imm3[] =
{"foo",
"foo",
"((b1>>4)&0x7)",
"foo",
"foo",
"foo",
"(pc[1]>>4)&0x7"};
/* How to get at a byte register from an index in the instruction at
nibble n */
char *breg[] =
{"foo",
"*(blow[b0])",
"*(bhigh[b1])",
"*(blow[b1])"};
/* How to get at a word register from an index in the instruction at
nibble n */
char *wreg[] =
{"foo",
"*(wlow[b0])",
"*(whigh[b1])",
"*(wlow[b1])"};
#define sorted_key noperands
/* sort the opcode table into h8_opcodes_sorted[0..255] */
static void
init ()
{
unsigned int i;
struct h8_opcode *p;
for (p = h8_opcodes; p->name; p++)
{
int n1 = 0;
int n2 = 0;
int j;
for (j = 0; p->data.nib[j] != E; j++)
{
if ((int) p->data.nib[j] == ABS16ORREL8SRC)
p->data.nib[j] = ABS16SRC;
if ((int) p->data.nib[j] == ABS16OR8SRC)
p->data.nib[j] = ABS16SRC;
if ((int) p->data.nib[j] == ABS16OR8DST)
p->data.nib[j] = ABS16DST;
}
if ((int) p->data.nib[0] < 16)
{
n1 = (int) p->data.nib[0];
}
else
n1 = 0;
if ((int) p->data.nib[1] < 16)
{
n2 = (int) p->data.nib[1];
}
else
n2 = 0;
for (i = 0; i < MAXSAME; i++)
{
int j = /* ((n3 >> 3) * 512) + ((n4 >> 3) * 256) + */ n1 * 16 + n2;
if (h8_opcodes_sorted[j][i] == (struct h8_opcode *) NULL)
{
h8_opcodes_sorted[j][i] = p;
p->sorted_key = j;
break;
}
}
if (i == MAXSAME)
abort ();
/* Just make sure there are an even number of nibbles in it, and
that the count is the same s the length */
for (i = 0; p->data.nib[i] != E; i++)
/*EMPTY*/ ;
if (i & 1)
abort ();
p->length = i / 2;
}
for (i = 0; i < PTWO; i++)
{
if (h8_opcodes_sorted[i][0])
p = h8_opcodes_sorted[i][0];
else
h8_opcodes_sorted[i][0] = p;
}
}
/* either fetch srca&srcb or store dst */
void
decode (p, fetch, size)
struct h8_opcode *p;
int fetch;
int size;
{
int i;
char *ss = size == 8 ? "BYTE" : "WORD";
for (i = 0; p->data.nib[i] != E; i++)
{
switch (p->data.nib[i])
{
case RS8:
if (fetch)
printf ("srca = %s;\n", breg[i]);
break;
case RS16 | B30:
case RS16 | B31:
case RS16:
if (fetch)
printf ("srca = %s;\n", wreg[i]);
break;
case RD8:
if (fetch)
printf ("srcb = %s;\n", breg[i]);
else
printf ("%s = dst;\n", breg[i]);
break;
case RD16 | B30:
case RD16 | B31:
case RD16:
if (fetch)
printf ("srcb = %s;\n", wreg[i]);
else
printf ("%s =dst;\n", wreg[i]);
break;
case IMM8:
if (fetch)
printf ("srca = b1;\n");
break;
case RSINC:
case RSINC | B30:
case RSINC | B31:
if (fetch)
{
printf ("srca = %s_MEM(%s);\n", ss, wreg[i]);
printf ("%s+=%d;\n", wreg[i], size / 8);
}
break;
case RSIND:
case RSIND | B30:
case RSIND | B31:
if (fetch)
{
printf ("lval = %s;\n", wreg[i]);
printf ("srca = %s_MEM(lval);\n", ss);
}
break;
case RDIND:
case RDIND | B30:
case RDIND | B31:
if (fetch)
{
printf ("lval = %s;\n", wreg[i]);
printf ("srcb = %s_MEM(lval);\n", ss);
}
else
{
printf ("SET_%s_MEM(lval,dst);\n", ss);
}
break;
case MEMIND:
if (fetch)
{
printf ("lval = pc[1];\n");
}
break;
case RDDEC:
case RDDEC | B30:
case RDDEC | B31:
if (!fetch)
{
printf ("%s -=%d;\n", wreg[i], size / 8);
printf ("SET_%s_MEM(%s, dst);\n", ss, wreg[i]);
}
break;
case IMM3:
case IMM3 | B31:
case IMM3 | B30:
if (fetch)
printf ("srca = %s;\n", imm3[i]);
break;
case IMM16:
if (fetch)
printf ("srca =( pc[1]);\n");
break;
case ABS8SRC:
if (fetch)
{
printf ("lval = (0xff00) + b1;\n");
printf ("srca = BYTE_MEM(lval);\n");
}
break;
case ABS8DST:
if (fetch)
{
printf ("lval = (0xff00) + b1;\n");
printf ("srcb = BYTE_MEM(lval);\n");
}
else
{
printf ("SET_BYTE_MEM(lval,dst);\n");
}
break;
case KBIT:
if (fetch)
printf ("srca = ((b1&0x80)?2:1);\n");
break;
case ABS16ORREL8SRC:
case ABS16SRC:
if (fetch)
{
printf ("lval = pc[1];\n");
printf ("srca = %s_MEM(lval);\n", size == 8 ? "BYTE" : "WORD");
}
break;
case DISPREG | B30:
case DISPREG | B31:
case DISPREG:
printf ("rn = %s & 0x7;\n", nibs[i]);
break;
case DISPSRC:
if (fetch)
{
printf ("lval = 0xffff&(pc[1] +reg[rn]);\n");
printf ("srca = %s_MEM(lval);\n", size == 8 ? "BYTE" : "WORD");
}
break;
case DISPDST:
if (fetch)
{
printf ("lval = 0xffff&(pc[1] +reg[rn]);\n");
printf ("srcb = %s_MEM(lval);\n", size == 8 ? "BYTE" : "WORD");
}
else
{
printf ("SET_%s_MEM(lval,dst);\n", ss);
}
break;
case ABS16DST:
if (fetch)
{
printf ("lval = (pc[1]);\n");
printf ("srcb = %s_MEM(lval);\n", ss);
}
else
{
printf ("SET_%s_MEM(lval,dst);\n", ss);
}
break;
case IGNORE:
break;
case DISP8:
printf (" /* DISP8 handled in opcode */\n");
break;
default:
if (p->data.nib[i] > HexF)
{
printf ("saved_state.exception = SIGILL;\n");
}
}
}
}
static void
esleep ()
{
printf ("saved_state.exception = SIGSTOP;\n");
}
static void
mov (p, s, sz)
struct h8_opcode *p;
char *s;
int sz;
{
printf ("dst = srca;\n");
}
static void
andc (p)
struct h8_opcode *p;
{
printf ("SET_CCR(GET_CCR() & srca);\n");
}
static void
addx (p)
struct h8_opcode *p;
{
printf ("dst = srca + srcb+ (c != 0);\n");
}
static void
subx (p)
struct h8_opcode *p;
{
printf ("dst = srcb - srca - (c != 0);\n");
}
static void
add (p, s, sz)
struct h8_opcode *p;
char *s;
int sz;
{
printf ("%s;\n", s);
}
static void
adds (p, s)
struct h8_opcode *p;
char *s;
{
printf ("%s;\n", s);
}
static void
bra (p, a)
struct h8_opcode *p;
char *a;
{
printf ("if (%s) npc += ((char )b1)>>1;\n", a);
}
static void
bsr (p, a)
struct h8_opcode *p;
char *a;
{
printf ("reg[7]-=2;\n");
printf ("tmp = reg[7];\n");
printf ("SET_WORD_MEM(tmp, (npc-saved_state.mem)*2);\n");
printf ("npc += ((char)b1)>>1;\n");
}
static void
cmp (p, a, s)
struct h8_opcode *p;
char *a;
int s;
{
decode (p, 1, s);
printf ("srca = -srca;\n");
printf ("dst = srca + srcb;\n");
}
static
void
jsr (p, a, s)
struct h8_opcode *p;
char *a;
int s;
{
printf ("if (b1 == 0xc4) {\n");
printf ("printf(\"%%c\", reg[2]);\n");
printf ("}\n");
printf ("else {\n");
printf ("reg[7]-=2;\n");
printf ("tmp = reg[7];\n");
printf ("SET_WORD_MEM(tmp, (npc-saved_state.mem)*2);\n");
printf ("npc = (lval>>1) + saved_state.mem;\n");
printf ("}");
}
static void
jmp (p, a, s)
struct h8_opcode *p;
char *a;
int s;
{
printf ("npc = (lval>>1) + saved_state.mem;\n");
}
static void
rts (p, a, s)
struct h8_opcode *p;
char *a;
int s;
{
printf ("tmp = reg[7];\n");
printf ("reg[7]+=2;\n");
printf ("npc = saved_state.mem + (WORD_MEM(tmp)>>1);\n");
}
static void
rte (p, a, s)
struct h8_opcode *p;
char *a;
int s;
{
printf ("reg[7]+=2;\n");
printf ("tmp = reg[7];\n");
printf ("reg[7]+=2;\n");
printf ("SET_CCR(tmp);\n");
printf("npc = saved_state.mem + (WORD_MEM(tmp)>>1);\n");
}
static void
setf (p, a, s)
struct h8_opcode *p;
char *a;
int s;
{
printf ("tmp = GET_CCR();\n");
printf ("tmp %s= srca;\n", a);
}
static void
bpt (p, a, s)
struct h8_opcode *p;
char *a;
int s;
{
printf ("saved_state.exception = SIGTRAP;\n");
printf ("npc = pc;\n");
}
static void
log (p, a, s)
struct h8_opcode *p;
char *a;
int s;
{
printf ("dst = srcb %s srca;\n", a);
}
static void
ulog (p, a, s)
struct h8_opcode *p;
char *a;
int s;
{
printf ("dst = %s srcb ;\n", a);
}
static void
nop ()
{
}
static void
rotl ()
{
printf ("c = srcb & 0x80;\n");
printf ("dst = srcb << 1;\n");
printf ("if (c) dst|=1;\n");
}
static void
rotr ()
{
printf ("c = srcb & 1;\n");
printf ("dst = srcb >> 1;\n");
printf ("if (c) dst|=0x80;\n");
}
static void
rotxl ()
{
printf ("tmp = srcb & 0x80;\n");
printf ("dst = srcb << 1;\n");
printf ("if (c) dst|=1;\n");
printf ("c = tmp;\n");
}
static void
rotxr ()
{
printf ("tmp = srcb & 1;\n");
printf ("dst = srcb >> 1;\n");
printf ("if (c) dst|=0x80;\n");
printf ("c = tmp;\n");
}
static void
shal ()
{
printf ("c = srcb&0x80;\n");
printf ("dst = srcb << 1;\n");
}
static
void
shar ()
{
printf ("c = srcb&0x1;\n");
printf ("if (srcb&0x80) dst = (srcb>>1) | 0x80;\n");
printf ("else dst = (srcb>>1) &~ 0x80;\n");
}
static
void
shll ()
{
printf ("c = srcb&0x80;\n");
printf ("dst = srcb << 1;\n");
}
static
void
shlr ()
{
printf ("c = srcb&0x1;\n");
printf ("dst = (srcb>>1) &~ 0x80;\n");
}
static
void
divxu ()
{
printf ("srca = %s;\n", breg[2]);
printf ("srcb = %s;\n", wreg[3]);
printf ("n = srca & 0x80;\n");
printf ("z = !srca;\n");
printf ("if (srca) dst = srcb / srca;tmp = srcb %% srca;\n");
printf ("%s = (dst & 0xff) | (tmp << 8);\n", wreg[3]);
}
static
void
mulxu ()
{
printf ("srca = %s;\n", breg[2]);
printf ("srcb = %s;\n", wreg[3]);
printf ("dst = (srcb&0xff) * srca;\n");
printf ("%s = dst;\n", wreg[3]);
}
static
void
inc ()
{
printf ("dst = %s;\n", breg[3]);
printf ("v = (dst==0x7f);\n");
printf ("dst++;\n");
printf ("%s= dst;\n", breg[3]);
}
static
void
bit (p, a, s)
struct h8_opcode *p;
char *a;
int s;
{
printf ("%s\n", a);
}
static
void
dec ()
{
printf ("dst = %s;\n", breg[3]);
printf ("v = (dst==0x80);\n");
printf ("dst--;\n");
printf ("%s = dst;\n", breg[3]);
}
char saf[] = "goto setflags;";
char sf[] = "goto shiftflags;";
char af8[] = "goto aluflags8;";
char af16[] = "goto aluflags16;";
char lf[] = "goto logflags;";
char icf[] = "goto incflags;";
char mf8[] = "goto movflags8;";
char mf16[] = "goto movflags16;";
char nx[] = "goto next;";
struct
{
char *ftype;
int decode;
char *name;
void (*func) ();
char *arg;
int size;
}
table [] =
{
{ nx, 1, "bld", bit, "dst = srcb; c = (srcb>>srca)&1;", 8 } ,
{ nx, 1, "bild", bit, "dst = srcb; c = !((srcb>>srca)&1);", 8 } ,
{ nx, 1, "band", bit, "dst = srcb; c = C &&((srcb>>srca)&1);", 8 } ,
{ nx, 1, "biand", bit, "dst = srcb; c = C &&(!((srcb>>srca)&1));", 8 } ,
{ nx, 1, "bior", bit, "dst = srcb; c = C ||(!((srcb>>srca)&1));", 8 } ,
{ nx, 1, "bor", bit, "dst = srcb; c = C ||(((srcb>>srca)&1));", 8 } ,
{ nx, 1, "bixor", bit, "dst = srcb; c = C ^(!((srcb>>srca)&1));", 8 } ,
{ nx, 1, "bxor", bit, "dst = srcb; c = C ^(((srcb>>srca)&1));", 8 } ,
{ nx, 1, "bnot", bit, "dst = srcb ^ (1<<srca);", 8 } ,
{ nx, 1, "bclr", bit, "dst = srcb & ~(1<<srca);", 8 } ,
{ nx, 1, "bset", bit, "dst = srcb | (1<<srca);", 8 } ,
{ nx, 1, "bst", bit, "dst = (srcb & ~(1<<srca))| ((C)<<srca);", 8 } ,
{ nx, 1, "bist", bit, "dst = (srcb & ~(1<<srca))| ((!C)<<srca);", 8 } ,
{ nx, 1, "btst", bit, "dst = srcb; z = !((srcb>>srca)&1);", 8 } ,
{ icf, 0, "dec", dec, 0, 0 } ,
{ icf, 0, "inc", inc, 0, 0 } ,
{ saf, 1, "orc", setf, "|", 0 } ,
{ saf, 1, "xorc", setf, "^", 0 } ,
{ saf, 1, "andc", setf, "&", 0 } ,
{ nx, 1, "nop", nop, 0, 0 } ,
{ nx, 1, "bra", bra, "1", 0 } ,
{ nx, 1, "brn", bra, "0", 0 } ,
{ nx, 1, "bhi", bra, "(C||Z)==0", 0 } ,
{ nx, 1, "bls", bra, "(C||Z)==1", 0 } ,
{ nx, 1, "bcs", bra, "C==1", 0 } ,
{ nx, 1, "bcc", bra, "C==0", 0 } ,
{ nx, 1, "bpl", bra, "N==0", 0 } ,
{ nx, 1, "bmi", bra, "N==1", 0 } ,
{ nx, 1, "bvs", bra, "V==1", 0 } ,
{ nx, 1, "bvc", bra, "V==0", 0 } ,
{ nx, 1, "bge", bra, "(N^V)==0", 0 } ,
{ nx, 1, "bgt", bra, "(Z|(N^V))==0", 0 } ,
{ nx, 1, "blt", bra, "(N^V)==1", 0 } ,
{ nx, 1, "ble", bra, "(Z|(N^V))==1", 0 } ,
{ nx, 1, "beq", bra, "Z==1", 0 } ,
{ nx, 1, "bne", bra, "Z==0", 0 } ,
{ nx, 1, "bsr", bsr, "", 0 } ,
{ nx, 1, "jsr", jsr, 0, 0 } ,
{ nx, 1, "jmp", jmp, 0, 0 } ,
{ nx, 0, "rts", rts, 0, 0 } ,
{ nx, 0, "rte", rte, 0, 0 } ,
{ nx, 1, "andc", andc, 0, 0 } ,
{ sf, 1, "shal", shal, 0, 0 } ,
{ sf, 1, "shar", shar, 0, 0 } ,
{ sf, 1, "shll", shll, 0, 0 } ,
{ sf, 1, "shlr", shlr, 0, 0 } ,
{ sf, 1, "rotxl", rotxl, 0, 0 } ,
{ sf, 1, "rotxr", rotxr, 0, 0 } ,
{ sf, 1, "rotl", rotl, 0, 0 } ,
{ sf, 1, "rotr", rotr, 0, 0 } ,
{ lf, 1, "xor", log, "^", 0 } ,
{ lf, 1, "and", log, "&", 0 } ,
{ lf, 1, "or", log, "|", 0 } ,
{ lf, 1, "not", ulog, " ~", 0 } ,
{ lf, 1, "neg", ulog, " - ", 0 } ,
{ nx, 1, "adds", adds, "dst = srca + srcb", 0 } ,
{ nx, 1, "subs", adds, "srca = -srca; dst = srcb + srca", 0 } ,
{ af8, 1, "add.b", add, "dst = srca + srcb", 8 } ,
{ af16, 1, "add.w", add, "dst = srca + srcb", 16 } ,
{ af16, 1, "sub.w", add, "srca = -srca; dst = srcb + srca", 16 } ,
{ af8, 1, "sub.b", add, "srca = -srca; dst = srcb + srca", 8 } ,
{ af8, 1, "addx", addx, 0, 8 } ,
{ af8, 1, "subx", subx, 0, 8 } ,
{ af8, 0, "cmp.b", cmp, 0, 8 } ,
{ af16, 0, "cmp.w", cmp, 0, 16 } ,
{ nx, 1, "sleep", esleep, 0, 0 } ,
{ nx, 0, "bpt", bpt, 0, 8 } ,
{ nx, 0, "divxu", divxu, 0, 0 } ,
{ nx, 0, "mulxu", mulxu, 0, 0 } ,
{ mf8, 1, "mov.b", mov, 0, 8 } ,
{ mf8, 1, "movtpe", mov, 0, 8 } ,
{ mf8, 1, "movfpe", mov, 0, 8 } ,
{ mf16, 1, "mov.w", mov, 0, 16 } ,
{ 0 }
};
static
void
edo (p)
struct h8_opcode *p;
{
int i;
printf ("%s %s %s\n", cs, p->name, ce);
for (i = 0; table[i].name; i++)
{
if (strcmp (table[i].name, p->name) == 0)
{
printf ("{\n");
if (table[i].decode)
decode (p, 1, table[i].size);
printf ("cycles += %d;\n", p->time);
printf ("npc = pc + %d;\n", p->length/2);
table[i].func (p, table[i].arg, table[i].size);
if (table[i].decode)
decode (p, 0, table[i].size);
if (table[i].ftype)
printf (table[i].ftype);
else
printf ("goto next;\n");
printf ("}\n");
return;
}
}
printf ("%s not found %s\n", cs, ce);
printf ("saved_state.exception = SIGILL;\n");
printf ("break;\n");
}
static
int
owrite (i)
int i;
{
/* write if statements to select the right opcode */
struct h8_opcode **p;
int needand = 1;
p = h8_opcodes_sorted[i];
printf ("case 0x%03x:\n", i);
if (p[1] == 0)
{
/* See if the next few also match */
while (h8_opcodes_sorted[i + 1][0] == *p)
{
i++;
printf ("case 0x%03x:\n", i);
}
/* Dont need any if's this is the only one */
edo (*p);
}
else
{
while (*p)
{
/* start two nibbles in since we know we match in the first byte */
int c;
int nib = 2;
int byte = 1;
int mask1[5];
int mask0[5];
int nibshift = 4;
int any = 0;
for (c = 0; c < 5; c++)
{
mask1[c] = 0;
mask0[c] = 0;
}
printf ("%s %x%x", cs, (*p)->data.nib[0], (*p)->data.nib[1]);
while ((c = (*p)->data.nib[nib]) != E)
{
if (c & B30)
{
/* bit 3 must be zero */
mask0[byte] |= 0x8 << nibshift;
printf ("0");
any = 1;
}
else if (c & B31)
{
/* bit 3 must be one */
mask1[byte] |= 0x8 << nibshift;
printf ("8");
any = 1;
}
else if (c <= HexF)
{
mask0[byte] |= ((~c) & 0xf) << nibshift;
mask1[byte] |= (c & 0xf) << nibshift;
printf ("%x", c);
any = 1;
}
else
{
printf ("x");
}
nib++;
if (nibshift == 4)
{
nibshift = 0;
}
else
{
byte++;
nibshift = 4;
}
}
printf ("*/\n");
if (any)
{
printf ("if (");
needand = 0;
for (c = 1; c < byte; c++)
{
if (mask0[c] | mask1[c])
{
int sh;
if (needand)
printf ("\n&&");
if (c & 1) sh = 0;else sh = 8;
if (c/2 == 0 && sh == 0)
printf("((b1&0x%x)==0x%x)", mask0[c]| mask1[c],
mask1[c]);
else {
printf ("((pc[%d]&(0x%02x<<%d))==(0x%x<<%d))",
c/2, mask0[c] | mask1[c],sh,
mask1[c],sh);
}
needand = 1;
}
}
printf (")\n");
}
edo (*p);
p++;
}
}
return i;
}
static
void
remove_dups ()
{
struct h8_opcode *s;
struct h8_opcode *d;
for (d = s = h8_opcodes; s->name; s++)
{
int doit = 1;
if (strcmp (s->name, "push") == 0)
doit = 0;
if (strcmp (s->name, "bhs") == 0)
doit = 0;
if (strcmp (s->name, "blo") == 0)
doit = 0;
if (strcmp (s->name, "bt") == 0)
doit = 0;
if (strcmp (s->name, "bf") == 0)
doit = 0;
if (strcmp (s->name, "pop") == 0)
doit = 0;
if (doit)
{
*d++ = *s;
}
}
*d++ = *s++;
}
int
main ()
{
int i;
remove_dups ();
init ();
printf ("%s do the operation %s\n", cs, ce);
printf ("switch (b0) \n{\n");
for (i = 0; i < PTWO; i++)
{
i = owrite (i);
}
printf ("}\n");
return 0;
}
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