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-rw-r--r--sim/z8k/writecode.c1948
1 files changed, 0 insertions, 1948 deletions
diff --git a/sim/z8k/writecode.c b/sim/z8k/writecode.c
deleted file mode 100644
index acff7c4..0000000
--- a/sim/z8k/writecode.c
+++ /dev/null
@@ -1,1948 +0,0 @@
-/* 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 */
-}
generated by cgit v1.1 at 2024-12-19 03:33:44 +0000