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binutils-gdb/sim/z8k/writecode.c
Andrew Cagney 73fa0d3fb2 * writecode.c (lookup_inst): Generate inverse table on-the-fly. 
(z8k_inv_list): Delete global.
(DIRTY_HACK): Delete macro.
(makelist): Delete global.
(main): Delete code making a list.  Delete dirty hack code.  Use
lookup_inst instead of z8k_inv_list.
* list.c: Delete file.
* Makefile.in (writecode): Do not link in list.o.
(list.o): Delete target.
2002-06-06 15:50:50 +00:00

1949 lines
38 KiB
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/* generate instructions for Z8KSIM
Copyright 1992, 1993, 2002 Free Software Foundation, Inc.
This file is part of Z8KSIM
Z8KSIM 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.
Z8KSIM 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 Z8KZIM; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* This program generates the code which emulates each of the z8k
instructions
code goes into three files, tc-gen1.h, tc-gen2.h and tc-gen3.h.
which file being made depends upon the options
-1 tc-gen1.h contains the fully expanded code for some selected
opcodes, (those in the quick.c list)
-2 tc-gen2.h contains a list of pointers to functions, one for each
opcode. It points to functions in tc-gen3.h and tc-gen1.h
depending upon quick.c
-3 tc-gen3.h contains all the opcodes in unexpanded form.
-b3 tc-genb3.h same as -3 but for long pointers
*/
/* steve chamberlain
sac@cygnus.com */
#include "config.h"
#include <ansidecl.h>
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#else
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#endif
#define NICENAMES
#define DEFINE_TABLE
#include "../opcodes/z8k-opc.h"
#define NOPS 500
struct opcode_value
{
int n;
struct opcode_value *next;
};
#define NICENAMES
int BIG;
static char *reg_names[] =
{"bad", "src", "dst", "aux_a", "aux_b", "aux_r", "aux_x"};
#define IS_DST(x) ((x & 0xf) == 2)
#define IS_SRC(x) ((x & 0xf)==1)
#define SIZE_ADDRESS (BIG ? 8 : 4) /* number of nibbles in a ptr*/
static int file;
static int nibs = 0;
static char *current_size;
static char *current_name;
static char current_word0[40];
static char current_byte0[40];
static char current_byte1[40];
static int indent;
static char *p;
static char *d;
struct opcode_value *list[NOPS];
static opcode_entry_type *
lookup_inst (what)
int what;
{
static short *z8k_inv_list = NULL;
const nr_z8k_inv_list_elements = 1 << 16;
if (z8k_inv_list == NULL)
{
/* Initialize the list to 0xff == -1 */
z8k_inv_list = calloc (nr_z8k_inv_list_elements, sizeof (short));
memset (z8k_inv_list, 0xff, nr_z8k_inv_list_elements * sizeof (short));
}
/* Entry empty? Fill it in. */
if (z8k_inv_list[what] == -1)
{
int nibl_index;
int nibl_matched;
unsigned short instr_nibl;
unsigned short tabl_datum, datum_class, datum_value;
char instr_nibbles[8];
opcode_entry_type *ptr = z8k_table;
nibl_matched = 0;
instr_nibbles[3] = (what >> 0) & 0xf;
instr_nibbles[2] = (what >> 4) & 0xf;
instr_nibbles[1] = (what >> 8) & 0xf;
instr_nibbles[0] = (what >> 12) & 0xf;
/* Assume it won't be found. */
z8k_inv_list[what] = -2;
while (ptr->name)
{
nibl_matched = 1;
for (nibl_index = 0; nibl_index < 4 && nibl_matched; nibl_index++)
{
instr_nibl = instr_nibbles[nibl_index];
tabl_datum = ptr->byte_info[nibl_index];
datum_class = tabl_datum & CLASS_MASK;
datum_value = ~CLASS_MASK & tabl_datum;
switch (datum_class)
{
case CLASS_BIT_1OR2:
if (datum_value != (instr_nibl & ~0x2))
nibl_matched = 0;
break;
case CLASS_IGNORE:
break;
case CLASS_BIT:
if (datum_value != instr_nibl)
nibl_matched = 0;
break;
case CLASS_00II:
if (!((~instr_nibl) & 0x4))
nibl_matched = 0;
break;
case CLASS_01II:
if (!(instr_nibl & 0x4))
nibl_matched = 0;
break;
case CLASS_0CCC:
if (!((~instr_nibl) & 0x8))
nibl_matched = 0;
break;
case CLASS_1CCC:
if (!(instr_nibl & 0x8))
nibl_matched = 0;
break;
case CLASS_0DISP7:
if (!((~instr_nibl) & 0x8))
nibl_matched = 0;
nibl_index += 1;
break;
case CLASS_1DISP7:
if (!(instr_nibl & 0x8))
nibl_matched = 0;
nibl_index += 1;
break;
case CLASS_REGN0:
if (instr_nibl == 0)
nibl_matched = 0;
break;
default:
break;
}
}
if (nibl_matched)
{
z8k_inv_list[what] = ptr->idx;
break; /* while */
}
ptr++;
}
}
if (z8k_inv_list[what] >= 0)
return z8k_table + z8k_inv_list[what];
return 0;
}
static char *
insn_4 (n)
int n;
{
switch (n)
{
case 1:
return "((iwords_0>>8) & 0xf)";
case 2:
return "((ibytes_1 >> 4) & 0xf)";
case 3:
return "((ibytes_1) & 0xf)";
case 4:
return "((ibytes_2>>4) & 0xf)";
case 5:
return "((ibytes_2) & 0xf)";
case 6:
return "((ibytes_3 >> 4) & 0xf)";
case 7:
return "((ibytes_3) & 0xf)";
default:
return "****";
}
}
char *
ptr_mode ()
{
if (BIG)
{
return "ptr_long";
}
return "word";
}
static
char *
ptr_size ()
{
if (BIG)
return "4";
return "2";
}
static char *
reg_n (x)
unsigned int x;
{
return reg_names[x & 0xf];
}
char *
stack_ptr ()
{
return BIG ? "14" : "15";
}
char *
mem ()
{
#if 0
return BIG ? "segmem" : "unsegmem";
#else
return "mem";
#endif
}
int
match (a)
char *a;
{
if (strncmp (p, a, strlen (a)) == 0)
{
p += strlen (a);
return 1;
}
return 0;
}
static
void
sub (y)
char *y;
{
sprintf (d, "%s", y);
d += strlen (d);
}
static char *
insn_16 (n)
int n;
{
switch (n)
{
case 0:
return "(iwords_0)";
case 4:
return "(iwords_1)";
case 8:
return "(iwords_2)";
case 12:
return "(iwords_3)";
default:
return "****";
}
}
static
char *
insn_32 (n)
int n;
{
switch (n)
{
case 0:
return "((iwords_0<<16) | (iwords_1))";
case 4:
return "((iwords_1<<16) | (iwords_2))";
case 8:
return "((iwords_2<<16) | (iwords_3))";
default:
return "****";
}
}
static char *
size_name (x)
int x;
{
switch (x)
{
case 8:
return "byte";
case 16:
return "word";
case 32:
return "long";
case 64:
return "quad";
}
return "!!";
}
/*VARARGS*/
void
emit (string, a1, a2, a3, a4, a5)
char *string;
char* a1;
char* a2;
char* a3;
char* a4;
char* a5;
{
int indent_inc = 0;
int indent_dec = 0;
int i;
char buffer[1000];
d = buffer;
p = string;
while (*p)
{
if (match ("<fop>"))
{
if (BIG)
{
sub ("bfop");
}
else
{
sub ("sfop");
}
}
else if (match ("<iptr>"))
{
if (BIG)
{
switch (nibs)
{
case 4:
sub ("(((iwords_1 << 8) | (iwords_2)) & 0x7fffff)");
break;
default:
sub ("fail(context,124)");
break;
}
}
else
{
switch (nibs)
{
case 4:
sub ("iwords_1");
break;
default:
sub ("fail(context,123)");
break;
}
}
}
else if (match ("<name>"))
{
sub (current_name);
}
else if (match ("<size>"))
{
sub (current_size);
}
else if (match ("<insn_4>"))
{
sub (insn_4 (nibs));
}
else if (match ("<insn_16>"))
{
sub (insn_16 (nibs));
}
else if (match ("<insn_32>"))
{
sub (insn_32 (nibs));
}
else if (match ("iwords_0"))
{
sub (current_word0);
}
else if (match ("ibytes_0"))
{
sub (current_byte0);
}
else if (match ("<ibytes_1>"))
{
sub (current_byte1);
}
else if (match ("<next_size>"))
{
if (strcmp (current_size, "word") == 0)
sub ("long");
if (strcmp (current_size, "byte") == 0)
sub ("word");
else if (strcmp (current_size, "long") == 0)
sub ("quad");
else
abort ();
}
else if (match ("<addr_type>"))
{
if (BIG)
sub ("unsigned long");
else
sub ("unsigned short");
}
else if (match ("<c_size>"))
{
if (strcmp (current_size, "word") == 0)
sub ("short");
else if (strcmp (current_size, "byte") == 0)
sub ("char");
else if (strcmp (current_size, "long") == 0)
sub ("long");
else
abort ();
}
else if (match ("<pc>"))
{
sub ("pc");
}
else if (match ("<mem>"))
{
sub (mem ());
}
else if (match ("<sp>"))
{
sub (stack_ptr ());
}
else if (match ("<ptr_size>"))
{
sub (ptr_size ());
}
else if (match ("<ptr_mode>"))
{
sub (ptr_mode ());
}
else if (match ("<insn_8>"))
{
switch (nibs)
{
case 2:
sub ("(iwords_0&0xff)");
break;
case 4:
sub ("(iwords_1>>8)");
break;
case 6:
sub ("(iwords_1&0xff)");
break;
case 8:
sub ("(iwords_2>>8)");
break;
case 12:
sub ("(/* WHO */iwords_3&0xff)");
break;
default:
abort ();
}
}
else
{
if (*p == '{')
indent_inc++;
if (*p == '}')
indent_dec++;
*d++ = *p;
p++;
}
}
*d++ = 0;
indent -= indent_dec;
for (i = 0; i < indent; i++)
printf ("\t");
indent += indent_inc;
printf (buffer, a1, a2, a3, a4, a5);
}
/* fetch the lvalues of the operands */
void
info_args (p)
opcode_entry_type *p;
{
unsigned int *s;
int done_one_imm8 = 0;
/* int done_read = 4;*/
s = p->byte_info;
nibs = 0;
while (*s)
{
switch (*s & CLASS_MASK)
{
case CLASS_BIT_1OR2:
emit ("register unsigned int imm_src=(<insn_4>& 2)?2:1;\n");
break;
case CLASS_IGNORE:
case CLASS_BIT:
/* Just ignore these, we've already decoded this bit */
nibs++;
break;
case CLASS_REGN0:
case CLASS_REG:
/* this nibble tells us which register to use as an arg,
if we've already gobbled the nibble we know what to use */
{
int regname = *s & 0xf;
emit ("register unsigned int reg_%s=<insn_4>;\n",
reg_names[regname]);
nibs++;
}
break;
case CLASS_ADDRESS:
emit ("register unsigned base_%s=<iptr>;\n", reg_n (*s));
nibs += SIZE_ADDRESS;
break;
case CLASS_01II:
case CLASS_00II:
emit ("register unsigned int imm_src=<insn_4>&0x2;\n");
nibs++;
break;
case CLASS_FLAGS:
emit ("register unsigned int imm_src=<insn_4>;\n");
nibs++;
break;
case CLASS_IMM:
/* Work out the size of the think to fetch */
{
switch (*s & ~CLASS_MASK)
{
case ARG_IMM16:
emit ("register unsigned imm_src=<insn_16>;\n");
nibs += 4;
break;
case ARG_IMM32:
emit ("register unsigned int imm_src= %s;\n", insn_32 (nibs));
nibs += 8;
break;
case ARG_IMM4:
emit ("register unsigned int imm_src=<insn_4>;\n");
nibs++;
break;
case ARG_NIM4:
emit ("register unsigned int imm_src = - <insn_4>;\n");
nibs++;
break;
case ARG_IMM2:
emit ("register unsigned int imm_src=<insn_4> & 0x2;\n");
nibs++;
break;
case ARG_IMM4M1:
emit ("register unsigned int imm_src=(<insn_4> + 1);\n");
nibs++;
break;
case ARG_IMM_1:
emit ("register unsigned int imm_src=1;\n");
break;
case ARG_IMM_2:
emit ("register unsigned int imm_src=2;\n");
break;
case ARG_NIM8:
emit ("register unsigned int imm_src=-<insn_8>;\n");
nibs += 2;
break;
case ARG_IMM8:
if (!done_one_imm8)
{
emit ("register unsigned int imm_src=<insn_8>;\n");
nibs += 2;
done_one_imm8 = 1;
}
break;
default:
emit ("register int fail%d=fail(context,1);\n", nibs);
break;
}
break;
case CLASS_DISP8:
/* We can't use `(char)' since char might be unsigned.
We can't use `(signed char)' because the compiler might be K&R.
This seems safe, since it only assumes that bytes are 8
bits. */
emit ("register unsigned int oplval_dst=((ibytes_1 << (sizeof (int) * 8 - 8)) >> (sizeof (int) * 8 - 9)) + pc;\n");
#if 0
/* Original code: fails if characters are unsigned. */
emit ("register unsigned int oplval_dst=(((char)ibytes_1)<<1) + pc;\n");
#endif
nibs += 2;
break;
case CLASS_CC:
emit ("register unsigned int op_cc=<insn_4>;\n");
nibs++;
break;
default:
emit ("register int FAIL%d=fail(context,2);\n", nibs);
break;
}
;
/* work out how to fetch the immediate value */
}
s++;
}
}
void
info_special (p, getdst, nostore, before, nosrc)
opcode_entry_type *p;
int *getdst;
int *nostore;
int *before;
int *nosrc;
{
switch (p->opcode)
{
case OPC_exts:
case OPC_extsb:
case OPC_extsl:
*nostore = 1;
*nosrc = 1;
break;
case OPC_ldm:
*nostore = 1;
*nosrc = 1;
break;
case OPC_negb:
case OPC_neg:
case OPC_sla:
case OPC_slab:
case OPC_slal:
case OPC_sda:
case OPC_sdab:
case OPC_sdal:
case OPC_com:
case OPC_comb:
case OPC_adc:
case OPC_sbc:
case OPC_nop:
case OPC_adcb:
case OPC_add:
case OPC_addb:
case OPC_addl:
case OPC_inc:
case OPC_sub:
case OPC_subb:
case OPC_subl:
case OPC_and:
case OPC_andb:
case OPC_xorb:
case OPC_xor:
break;
case OPC_mult:
case OPC_multl:
case OPC_div:
case OPC_divl:
*nostore = 1;
break;
case OPC_testb:
case OPC_test:
case OPC_testl:
case OPC_cp:
case OPC_cpb:
case OPC_cpl:
case OPC_bit:
*nostore = 1;
*before = 0;
break;
case OPC_bpt:
case OPC_jr:
case OPC_jp:
case OPC_ret:
case OPC_call:
case OPC_tcc:
*nosrc = 1;
*nostore = 1;
*before = 1;
break;
case OPC_sc:
*nostore = 1;
*before = 0;
break;
case OPC_clrb:
case OPC_clr:
*before = 1;
*nosrc = 1;
break;
case OPC_ldi:
case OPC_ldib:
case OPC_lddb:
case OPC_ldd:
*before = 1;
*nostore = 1;
*nosrc = 1;
break;
case OPC_ldk:
case OPC_ld:
case OPC_ldb:
case OPC_ldl:
*before = 1;
*getdst = 0;
break;
case OPC_push:
case OPC_pushl:
case OPC_pop:
case OPC_popl:
*before = 1;
*getdst = 0;
break;
case OPC_lda:
*nosrc = 1;
break;
}
}
/* calculate the lvalues required for the opcode */
void
info_lvals (p)
opcode_entry_type *p;
{
/* emit code to work out lvalues, if any */
unsigned int *i = p->arg_info;
while (*i)
{
current_name = reg_n (*i);
current_size = size_name (p->type);
switch (*i & CLASS_MASK)
{
case CLASS_X:
/* address(reg) */
emit ("register <addr_type> oplval_<name>= ((base_<name> + (short)get_word_reg(context,reg_<name>)) & 0xffff) + (base_<name> & ~0xffff);\n");
break;
case CLASS_IR:
/* Indirect register */
emit ("register int oplval_<name> = get_<ptr_mode>_reg(context,reg_<name>);\n");
break;
case CLASS_DA:
emit ("register int oplval_<name>=base_<name>;\n");
break;
case CLASS_IMM:
case CLASS_REG_WORD:
case CLASS_REG_LONG:
case CLASS_REG_BYTE:
case CLASS_PR:
break;
case CLASS_BA:
emit ("register int oplval_<name> = get_<ptr_mode>_reg(context,reg_<name>) + (short)(imm_src);\n");
break;
case CLASS_BX:
emit ("register int oplval_<name> = get_<ptr_mode>_reg(context,reg_<name>)\n");
emit (" + get_word_reg(context,reg_aux_x);\n");
break;
}
i++;
}
}
/* emit code to fetch the args from calculated lvalues */
int allregs;
void
info_fetch (p, getdst)
opcode_entry_type *p;
int getdst;
{
unsigned int *i = p->arg_info;
int had_src = 0;
allregs = 1;
while (*i)
{
current_name = reg_n (*i);
current_size = size_name (p->type);
switch (*i & CLASS_MASK)
{
case CLASS_X:
case CLASS_IR:
case CLASS_BA:
case CLASS_BX:
case CLASS_DA:
if (!getdst && IS_DST (*i))
break;
emit ("register int op_<name>= get_<size>_<mem>_da(context,oplval_<name>);\n");
allregs = 0;
break;
case CLASS_IMM:
if (!had_src)
{
if (p->opcode == OPC_out ||
p->opcode == OPC_outb ||
p->opcode == OPC_sout ||
p->opcode == OPC_soutb)
{
/* The imm is a dest here */
emit ("register int op_dst = imm_src;\n");
}
else
{
emit ("register int op_src = imm_src;\n");
}
}
break;
case CLASS_REG_QUAD:
if (!getdst && IS_DST (*i))
break;
had_src |= IS_SRC (*i);
emit ("UDItype op_<name> ;\n");
break;
case CLASS_REG_WORD:
if (!getdst && IS_DST (*i))
break;
had_src |= IS_SRC (*i);
emit ("register int op_<name> = get_word_reg(context,reg_<name>);\n");
break;
case CLASS_REG_LONG:
if (!getdst && IS_DST (*i))
break;
had_src |= IS_SRC (*i);
emit ("register int op_<name> = get_long_reg(context,reg_<name>);\n");
break;
case CLASS_REG_BYTE:
if (!getdst && IS_DST (*i))
break;
had_src |= IS_SRC (*i);
emit ("register int op_<name> = get_byte_reg(context,reg_<name>);\n");
break;
}
i++;
}
}
static void
normal_flags (p, s, neg)
opcode_entry_type *p;
char *s;
{
emit (" %s;\n", s);
emit ("NORMAL_FLAGS(context,%d, tmp, op_dst, op_src,%d); \n", p->type,neg);
}
static void
test_normal_flags (p, s, opt)
opcode_entry_type *p;
char *s;
int opt;
{
emit (" %s;\n", s);
if (0 && opt)
{
emit ("context->broken_flags = TST_FLAGS;\n");
emit ("context->size = %d;\n", p->type);
}
else
{
emit ("TEST_NORMAL_FLAGS(context,%d, tmp); \n", p->type);
}
}
static void
optimize_normal_flags (p, s,neg)
opcode_entry_type *p;
char *s;
{
emit (" %s;\n", s);
#if 0
emit ("context->broken_flags = CMP_FLAGS;\n");
#else
emit ("NORMAL_FLAGS(context,%d, tmp, op_dst, op_src,%d); \n", p->type, neg);
#endif
}
static
void
jp (p)
opcode_entry_type *p;
{
emit ("if(op_cc == 8 || COND(context,op_cc)) pc = oplval_dst;\n");
}
static void
jr (p)
opcode_entry_type *p;
{
emit ("if(op_cc == 8 || COND(context,op_cc)) pc = oplval_dst;\n");
}
static void
ret (p)
opcode_entry_type *p;
{
emit ("if(op_cc == 8 || COND(context,op_cc))\n{\n");
emit ("pc = get_<ptr_mode>_<mem>_ir(context,<sp>);\n");
emit ("put_<ptr_mode>_reg(context,<sp>, get_<ptr_mode>_reg(context,<sp>) + <ptr_size>);\n");
emit ("};\n");
}
static void
call (p)
opcode_entry_type *p;
{
emit ("put_<ptr_mode>_reg(context,<sp>,tmp = get_<ptr_mode>_reg(context,<sp>) - <ptr_size>);\n");
emit ("put_<ptr_mode>_<mem>_da(context,tmp, pc);\n");
emit ("pc = oplval_dst;\n");
}
static void
push (p)
opcode_entry_type *p;
{
emit ("tmp = op_src;\n");
emit ("oplval_dst -= %d;\n", p->type / 8);
emit ("put_<ptr_mode>_reg(context,reg_dst, oplval_dst);\n");
}
static void
pop (p)
opcode_entry_type *p;
{
emit ("tmp = op_src;\n");
emit ("put_<ptr_mode>_reg(context,reg_src, oplval_src + %d);\n", p->type / 8);
}
static void
ld (p)
opcode_entry_type *p;
{
emit ("tmp = op_src;\n");
}
static void
sc ()
{
emit ("support_call(context,imm_src);\n");
}
static void
bpt ()
{
emit ("pc -=2; \n");
emit ("context->exception = SIM_BREAKPOINT;\n");
}
static void
ldi (p, size, inc)
opcode_entry_type *p;
int size;
int inc;
{
int dinc = (size / 8) * inc;
current_size = size_name (size);
emit ("{ \n");
emit ("int type = %s;\n", insn_4 (7));
emit ("int rs = get_<ptr_mode>_reg(context,reg_src);\n");
emit ("int rd = get_<ptr_mode>_reg(context,reg_dst);\n");
emit ("int rr = get_word_reg(context,reg_aux_r);\n");
emit ("do {\n");
emit ("put_<size>_<mem>_da(context,rd, get_<size>_<mem>_da(context,rs));\n");
emit ("rd += %d;\n", dinc);
emit ("rs += %d;\n", dinc);
emit ("rr --;\n");
emit ("context->cycles += 9;\n");
emit ("} while (!type && rr != 0 && context->exception <= 1);\n");
emit ("if (context->exception>1) pc -=4;\n");
emit ("put_<ptr_mode>_reg(context,reg_src, rs);\n");
emit ("put_<ptr_mode>_reg(context,reg_dst, rd);\n");
emit ("put_word_reg(context,reg_aux_r, rr);\n");
emit ("}\n");
}
static void
shift (p, arith)
opcode_entry_type *p;
int arith;
{
/* We can't use `(char)' since char might be unsigned.
We can't use `(signed char)' because the compiler might be K&R.
This seems safe, since it only assumes that bytes are 8 bits. */
emit ("op_src = (op_src << (sizeof (int) * 8 - 8)) >> (sizeof (int) * 8 - 8);\n");
#if 0
/* Original code: fails if characters are unsigned. */
emit ("op_src = (char)op_src;\n");
#endif
emit ("if (op_src < 0) \n");
emit ("{\n");
emit ("op_src = -op_src;\n");
emit ("op_dst = (%s <c_size>)op_dst;\n", arith ? "" : "unsigned");
emit ("tmp = (%s op_dst) >> op_src;\n", arith ? "" : "(unsigned)");
emit ("context->carry = op_dst >> (op_src-1);\n", p->type);
emit ("}\n");
emit ("else\n");
emit ("{\n");
emit ("tmp = op_dst << op_src;\n");
emit ("context->carry = op_dst >> (%d - op_src);\n", p->type);
emit ("}\n");
emit ("context->zero = (<c_size>)tmp == 0;\n");
emit ("context->sign = (int)((<c_size>)tmp) < 0;\n");
emit ("context->overflow = ((int)tmp < 0) != ((int)op_dst < 0);\n");
emit ("context->cycles += 3*op_src;\n");
emit ("context->broken_flags = 0;\n");
}
static void
rotate (p, through_carry, size, left)
opcode_entry_type *p;
int through_carry;
int size;
int left;
{
if (!left)
{
emit ("while (op_src--) {\n");
emit ("int rotbit;\n");
emit ("rotbit = op_dst & 1;\n");
emit ("op_dst = ((unsigned)op_dst) >> 1;\n");
if (through_carry)
{
emit ("op_dst |= context->carry << %d;\n", size - 1);
}
else
{
emit ("op_dst |= rotbit << %d;\n", size - 1);
}
emit ("context->carry = rotbit;\n");
emit ("}\n");
}
else
{
emit ("while (op_src--) {\n");
emit ("int rotbit;\n");
emit ("rotbit = (op_dst >> (%d))&1;\n", size - 1);
emit ("op_dst <<=1;\n");
if (through_carry)
{
emit ("if (context->carry) op_dst |=1;\n");
}
else
{
emit ("if (rotbit) op_dst |= 1;\n");
}
emit ("context->carry = rotbit;\n");
emit ("}\n");
}
emit ("tmp = (<c_size>)op_dst;\n");
emit ("context->zero = tmp == 0;\n");
emit ("context->sign = (int)tmp < 0;\n");
emit ("context->overflow = ((int)tmp < 0) != ((int)op_dst < 0);\n");
emit ("context->cycles += 3*op_src;\n");
emit ("context->broken_flags = 0;\n");
}
static void
adiv (p)
opcode_entry_type *p;
{
emit ("if (op_src==0)\n");
emit ("{\n");
emit ("context->exception = SIM_DIV_ZERO;\n");
emit ("}\n");
emit ("else\n");
emit ("{\n");
if (p->type == 32)
{
emit ("op_dst.low = (int)get_long_reg(context,reg_dst+2);\n");
emit ("op_dst.high = (int)get_long_reg(context,reg_dst+0);\n");
#ifdef __GNUC__
emit ("tmp = (((long long)op_dst.high << 32) + (op_dst.low)) / (int)op_src;\n");
#else
emit ("tmp = (long)op_dst.low / (int)op_src;\n");
#endif
emit ("put_long_reg(context,reg_dst+2, tmp);\n");
#ifdef __GNUC__
emit ("put_long_reg(context,reg_dst, (((long long)op_dst.high << 32) + (op_dst.low)) %% (int)op_src);\n");
#else
emit ("put_long_reg(context,reg_dst, (int)op_dst.low %% (int)op_src);\n");
#endif
emit ("context->zero = op_src == 0 || (op_dst.low==0 && op_dst.high==0);\n");
}
else
{
emit ("tmp = (long)op_dst / (short)op_src;\n");
emit ("put_word_reg(context,reg_dst+1, tmp);\n");
emit ("put_word_reg(context,reg_dst, (long) op_dst %% (short)op_src);\n");
emit ("context->zero = op_src == 0 || op_dst==0;\n");
}
emit ("context->sign = (int)tmp < 0;\n");
emit ("context->overflow =(tmp & 0x%x) != 0;\n",
~((1 << (p->type)) - 1));
emit ("context->carry = (tmp & 0x%x) != 0;\n",
~(1 << (p->type)));
emit ("}\n");
}
static void
dobit (p)
opcode_entry_type *p;
{
emit("context->zero = (op_dst & (1<<op_src))==0;\n");
emit("context->broken_flags = 0;\n");
}
static void
doset (p, v)
opcode_entry_type*p;
int v;
{
if (v)
emit (" tmp = op_dst | (1<< op_src);\n");
else
emit (" tmp = op_dst & ~(1<< op_src);\n");
}
static void
mult (p)
opcode_entry_type *p;
{
if (p->type == 32)
{
emit ("op_dst.low = get_long_reg(context,reg_dst+2);\n");
emit ("tmp = op_dst.low * op_src;\n");
emit ("put_long_reg(context,reg_dst+2, tmp);\n");
emit ("put_long_reg(context,reg_dst, 0);\n");
}
else
{
emit ("op_dst = get_word_reg(context,reg_dst+1);\n");
emit ("tmp = op_dst * op_src;\n");
emit ("put_long_reg(context,reg_dst, tmp);\n");
}
emit ("context->sign = (int)tmp < 0;\n");
emit ("context->overflow =0;\n");
emit ("context->carry = (tmp & 0x%x) != 0;\n", ~((1 << (p->type)) - 1));
emit ("context->zero = tmp == 0;\n");
}
static void
exts (p)
opcode_entry_type *p;
{
/* Fetch the ls part of the src */
current_size = size_name (p->type * 2);
if (p->type == 32)
{
emit ("tmp= get_long_reg(context,reg_dst+2);\n");
emit ("if (tmp & (1<<%d)) {\n", p->type - 1);
emit ("put_long_reg(context,reg_dst, 0xffffffff);\n");
emit ("}\n");
emit ("else\n");
emit ("{\n");
emit ("put_long_reg(context,reg_dst, 0);\n");
emit ("}\n");
}
else
{
emit ("tmp= get_<size>_reg(context,reg_dst);\n");
emit ("if (tmp & (1<<%d)) {\n", p->type - 1);
emit ("tmp |= 0x%x;\n", ~((1 << p->type) - 1));
emit ("}\n");
emit ("else\n");
emit ("{\n");
emit ("tmp &= 0x%x;\n", ((1 << p->type) - 1));
emit ("}\n");
emit ("put_<size>_reg(context,reg_dst, tmp);\n");
}
}
doflag(on)
int on;
{
/* Load up the flags */
emit(" COND (context, 0x0b);\n");
if (on)
emit ("{ int on =1;\n ");
else
emit ("{ int on =0;\n ");
emit ("if (imm_src & 1)\n");
emit ("PSW_OVERFLOW = on;\n");
emit ("if (imm_src & 2)\n");
emit ("PSW_SIGN = on;\n");
emit ("if (imm_src & 4)\n");
emit ("PSW_ZERO = on;\n");
emit ("if (imm_src & 8)\n");
emit ("PSW_CARRY = on;\n");
emit("}\n");
}
/* emit code to perform operation */
void
info_docode (p)
opcode_entry_type *p;
{
switch (p->opcode)
{
case OPC_clr:
case OPC_clrb:
emit ("tmp = 0;\n");
break;
case OPC_ex:
case OPC_exb:
emit ("tmp = op_src; \n");
if (allregs)
{
emit ("put_<size>_reg(context,reg_src, op_dst);\n");
}
else
{
emit ("put_<size>_mem_da(context, oplval_src, op_dst);\n");
}
break;
case OPC_adc:
case OPC_adcb:
normal_flags (p, "op_src += COND(context,7);tmp = op_dst + op_src ;",0);
break;
case OPC_sbc:
normal_flags (p, "op_src += COND(context,7);tmp = op_dst - op_src ;",1);
break;
case OPC_nop:
break;
case OPC_com:
case OPC_comb:
test_normal_flags (p, "tmp = ~ op_dst", 1);
break;
case OPC_and:
case OPC_andb:
test_normal_flags (p, "tmp = op_dst & op_src", 1);
break;
case OPC_xor:
case OPC_xorb:
test_normal_flags (p, "tmp = op_dst ^ op_src", 1);
break;
case OPC_or:
case OPC_orb:
test_normal_flags (p, "tmp = op_dst | op_src", 1);
break;
case OPC_sla:
case OPC_slab:
case OPC_slal:
case OPC_sda:
case OPC_sdab:
case OPC_sdal:
shift (p, 1);
break;
case OPC_sll:
case OPC_sllb:
case OPC_slll:
case OPC_sdl:
case OPC_sdlb:
case OPC_sdll:
shift (p, 0);
break;
case OPC_rl:
rotate (p, 0, 16, 1);
break;
case OPC_rlb:
rotate (p, 0, 8, 1);
break;
case OPC_rr:
rotate (p, 0, 16, 0);
break;
case OPC_rrb:
rotate (p, 0, 8, 0);
break;
case OPC_rrc:
rotate (p, 1, 16, 0);
break;
case OPC_rrcb:
rotate (p, 1, 8, 0);
break;
case OPC_rlc:
rotate (p, 1, 16, 1);
break;
case OPC_rlcb:
rotate (p, 1, 8, 1);
break;
case OPC_extsb:
case OPC_exts:
case OPC_extsl:
exts (p);
break;
case OPC_add:
case OPC_addb:
case OPC_addl:
case OPC_inc:
case OPC_incb:
optimize_normal_flags (p, "tmp = op_dst + op_src",0);
break;
case OPC_testb:
case OPC_test:
case OPC_testl:
test_normal_flags (p, "tmp = op_dst", 0);
break;
case OPC_cp:
case OPC_cpb:
case OPC_cpl:
normal_flags (p, "tmp = op_dst - op_src",1);
break;
case OPC_negb:
case OPC_neg:
emit ("{\n");
emit ("int op_src = -op_dst;\n");
emit ("op_dst = 0;\n");
optimize_normal_flags (p, "tmp = op_dst + op_src;\n",1);
emit ("}");
break;
case OPC_sub:
case OPC_subb:
case OPC_subl:
case OPC_dec:
case OPC_decb:
optimize_normal_flags (p, "tmp = op_dst - op_src",1);
break;
case OPC_bpt:
bpt ();
break;
case OPC_jr:
jr (p);
break;
case OPC_sc:
sc ();
break;
case OPC_jp:
jp (p);
break;
case OPC_ret:
ret (p);
break;
case OPC_call:
call (p);
break;
case OPC_tcc:
case OPC_tccb:
emit ("if(op_cc == 8 || COND(context,op_cc)) put_word_reg(context,reg_dst, 1);\n");
break;
case OPC_lda:
emit ("tmp = oplval_src; \n");
/*(((oplval_src) & 0xff0000) << 8) | (oplval_src & 0xffff); \n");*/
break;
case OPC_ldk:
case OPC_ld:
case OPC_ldb:
case OPC_ldl:
ld (p);
break;
case OPC_ldib:
ldi (p, 8, 1);
break;
case OPC_ldi:
ldi (p, 16, 1);
break;
case OPC_lddb:
ldi (p, 8, -1);
break;
case OPC_ldd:
ldi (p, 16, -1);
break;
case OPC_push:
case OPC_pushl:
push (p);
break;
case OPC_div:
case OPC_divl:
adiv (p);
break;
case OPC_mult:
case OPC_multl:
mult (p);
break;
case OPC_pop:
case OPC_popl:
pop (p);
break;
case OPC_set:
doset (p,1);
break;
case OPC_res:
doset (p,0);
break;
case OPC_bit:
dobit(p);
break;
case OPC_resflg:
doflag(0);
break;
case OPC_setflg:
doflag(1);
break;
default:
emit ("tmp = fail(context,%d);\n", p->opcode);
break;
}
}
/* emit code to store result in calculated lvalue */
void
info_store (p)
opcode_entry_type *p;
{
unsigned int *i = p->arg_info;
while (*i)
{
current_name = reg_n (*i);
current_size = size_name (p->type);
if (IS_DST (*i))
{
switch (*i & CLASS_MASK)
{
case CLASS_PR:
emit ("put_<ptr_mode>_reg(context,reg_<name>, tmp);\n");
break;
case CLASS_REG_LONG:
case CLASS_REG_WORD:
case CLASS_REG_BYTE:
emit ("put_<size>_reg(context,reg_<name>,tmp);\n");
break;
case CLASS_X:
case CLASS_IR:
case CLASS_DA:
case CLASS_BX:
case CLASS_BA:
emit ("put_<size>_<mem>_da(context,oplval_<name>, tmp);\n");
break;
case CLASS_IMM:
break;
default:
emit ("abort(); ");
break;
}
}
i++;
}
}
static
void
mangle (p, shortcut, value)
opcode_entry_type *p;
int shortcut;
int value;
{
int nostore = 0;
int extra;
int getdst = 1;
int before = 0;
int nosrc = 0;
emit ("/\052 %s \052/\n", p->nicename);
if (shortcut)
{
emit ("int <fop>_%04x(context,pc)\n", value);
}
else
{
emit ("int <fop>_%d(context,pc,iwords0)\n", p->idx);
emit ("int iwords0;\n");
}
emit ("sim_state_type *context;\n");
emit ("int pc;\n");
emit ("{\n");
emit ("register unsigned int tmp;\n");
if (shortcut)
{
emit ("register unsigned int iwords0 = 0x%x;\n", value);
}
/* work out how much bigger this opcode could be because it's large
model */
if (BIG)
{
int i;
extra = 0;
for (i = 0; i < 4; i++)
{
if ((p->arg_info[i] & CLASS_MASK) == CLASS_DA
|| (p->arg_info[i] & CLASS_MASK) == CLASS_X)
extra += 2;
}
}
else
{
extra = 0;
}
printf (" /* Length %d */ \n", p->length + extra);
switch (p->length + extra)
{
case 2:
emit ("pc += 2\n;");
break;
case 4:
emit ("register unsigned int iwords1 = get_word_mem_da(context,pc+2);\n");
emit ("pc += 4;\n");
break;
case 6:
emit ("register unsigned int iwords1 = get_word_mem_da(context,pc+2);\n");
emit ("register unsigned int iwords2 = get_word_mem_da(context,pc+4);\n");
emit ("pc += 6;\n");
break;
case 8:
emit ("register unsigned int iwords1 = get_word_mem_da(context,pc+2);\n");
emit ("register unsigned int iwords2 = get_word_mem_da(context,pc+4);\n");
emit ("register unsigned int iwords3 = get_word_mem_da(context,pc+6);\n");
emit ("pc += 8;\n");
break;
default:
break;
}
emit ("context->cycles += %d;\n", p->cycles);
emit ("{\n");
info_args (p);
info_special (p, &getdst, &nostore, &before, &nosrc);
info_lvals (p);
if (!nosrc)
{
info_fetch (p, getdst);
}
if (before)
{
info_docode (p);
}
else
{
info_docode (p);
}
if (!nostore)
info_store (p);
emit ("}\n");
emit ("return pc;\n");
emit ("}\n");
}
void
static
one_instruction (i)
int i;
{
/* find the table entry */
opcode_entry_type *p = z8k_table + i;
if (!p)
return;
mangle (p, 0, 0);
}
void
add_to_list (ptr, value)
struct opcode_value **ptr;
int value;
{
struct opcode_value *prev;
prev = *ptr;
*ptr = (struct opcode_value *) malloc (sizeof (struct opcode_value));
(*ptr)->n = value;
(*ptr)->next = prev;
}
void
build_list (i)
int i;
{
opcode_entry_type *p = lookup_inst (i);
if (!p)
return;
add_to_list (&list[p->idx], i);
}
int
main (ac, av)
int ac;
char **av;
{
int i;
int needcomma = 0;
for (i = 1; i < ac; i++)
{
if (strcmp (av[i], "-1") == 0)
file = 1;
if (strcmp (av[i], "-2") == 0)
file = 2;
if (strcmp (av[i], "-3") == 0)
file = 3;
if (strcmp (av[i], "-b3") == 0)
{
file = 3;
BIG = 1;
}
}
/* First work out which opcodes use which bit patterns,
build a list of all matching bit pattens */
for (i = 0; i < 1 << 16; i++)
{
build_list (i);
}
#if DUMP_LIST
for (i = 0; i < NOPS; i++)
{
struct opcode_value *p;
printf ("%d,", i);
p = list[i];
while (p)
{
printf (" %04x,", p->n);
p = p->next;
}
printf ("-1\n");
}
#endif
if (file == 1)
{
extern int quick[];
/* Do the shortcuts */
printf (" /* SHORTCUTS */\n");
for (i = 0; quick[i]; i++)
{
int t = quick[i];
mangle (lookup_inst (t), 1, t);
}
}
if (file == 3)
{
printf (" /* NOT -SHORTCUTS */\n");
for (i = 0; i < NOPS; i++)
{
if (list[i])
{
one_instruction (i);
}
else
{
emit ("int <fop>_%d(context,pc)\n", i);
printf ("sim_state_type *context;\n");
printf ("int pc;\n");
emit ("{ <fop>_bad1();return pc; }\n");
}
}
emit ("int <fop>_bad() ;\n");
/* Write the jump table */
emit ("int (*(<fop>_table[]))() = {");
needcomma = 0;
for (i = 0; i < NOPS; i++)
{
if (needcomma)
printf (",");
emit ("<fop>_%d\n", i);
needcomma = 1;
}
emit ("};\n");
}
if (file == 2)
{
extern int quick[];
/* Static - since it's too be to be automatic on the apollo */
static int big[64 * 1024];
for (i = 0; i < 64 * 1024; i++)
big[i] = 0;
for (i = 0; quick[i]; i++)
{
#if 0
printf ("extern int <fop>_%04x();\n", quick[i]);
#endif
big[quick[i]] = 1;
}
for (i = 0; i < NOPS; i++)
{
#if 0
printf ("extern int fop_%d();\n", i);
#endif
}
#if 0
printf ("extern int fop_bad();\n");
#endif
printf ("struct op_info op_info_table[] = {\n");
for (i = 0; i < 1 << 16; i++)
{
opcode_entry_type *p = lookup_inst (i);
if (needcomma)
printf (",");
#if 0
if (big[i])
{
printf ("<fop>_%04x", i);
}
else
#endif
if (p != NULL)
{
printf ("%d", p->idx);
}
else
printf ("400");
if (p != NULL)
{
printf (" /* %04x %s */\n", i, p->nicename);
}
else
{
printf ("\n");
}
needcomma = 1;
}
printf ("};\n");
}
return 0;
}
char *
insn_ptr (n)
int n;
{
if (BIG)
{
abort ();
}
switch (n)
{
case 4:
return "iwords_1";
default:
return "fail(context,123)";
}
}
/* work out if the opcode only wants lvalues */
int
lvalue (p)
opcode_entry_type *p;
{
switch (p->opcode)
{
case OPC_lda:
return 1;
case OPC_call:
case OPC_jp:
return 1;
default:
return 0;
}
}
int
info_len_in_words (o)
opcode_entry_type *o;
{
unsigned int *p = o->byte_info;
int nibs = 0;
while (*p)
{
switch (*p & CLASS_MASK)
{
case CLASS_IGNORE:
case CLASS_BIT:
case CLASS_REGN0:
case CLASS_REG:
case CLASS_01II:
case CLASS_00II:
nibs++;
break;
case CLASS_ADDRESS:
nibs += SIZE_ADDRESS;
break;
case CLASS_IMM:
switch (*p & ~CLASS_MASK)
{
case ARG_IMM16:
nibs += 4;
break;
case ARG_IMM32:
nibs += 8;
break;
case ARG_IMM2:
case ARG_IMM4:
case ARG_NIM4:
case ARG_IMM4M1:
case ARG_IMM_1:
case ARG_IMM_2:
case ARG_IMMNMINUS1:
nibs++;
break;
case ARG_NIM8:
case ARG_IMM8:
nibs += 2;
break;
default:
abort ();
}
break;
case CLASS_DISP:
switch (*p & ~CLASS_MASK)
{
case ARG_DISP16:
nibs += 4;
break;
case ARG_DISP12:
nibs += 3;
break;
case ARG_DISP8:
nibs += 2;
break;
default:
abort ();
}
break;
case CLASS_0DISP7:
case CLASS_1DISP7:
case CLASS_DISP8:
nibs += 2;
break;
case CLASS_BIT_1OR2:
case CLASS_0CCC:
case CLASS_1CCC:
case CLASS_CC:
nibs++;
break;
default:
emit ("don't know %x\n", *p);
}
p++;
}
return nibs / 4; /* return umber of words */
}
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