338 lines
7.2 KiB
C
338 lines
7.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Generate opcode table initializers for the in-kernel disassembler.
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*
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* Copyright IBM Corp. 2017
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*
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <stdio.h>
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#define STRING_SIZE_MAX 20
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struct insn_type {
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unsigned char byte;
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unsigned char mask;
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char **format;
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};
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struct insn {
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struct insn_type *type;
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char opcode[STRING_SIZE_MAX];
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char name[STRING_SIZE_MAX];
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char upper[STRING_SIZE_MAX];
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char format[STRING_SIZE_MAX];
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unsigned int name_len;
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};
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struct insn_group {
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struct insn_type *type;
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int offset;
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int count;
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char opcode[2];
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};
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struct insn_format {
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char *format;
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int type;
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};
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struct gen_opcode {
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struct insn *insn;
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int nr;
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struct insn_group *group;
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int nr_groups;
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};
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/*
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* Table of instruction format types. Each opcode is defined with at
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* least one byte (two nibbles), three nibbles, or two bytes (four
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* nibbles).
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* The byte member of each instruction format type entry defines
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* within which byte of an instruction the third (and fourth) nibble
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* of an opcode can be found. The mask member is the and-mask that
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* needs to be applied on this byte in order to get the third (and
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* fourth) nibble of the opcode.
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* The format array defines all instruction formats (as defined in the
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* Principles of Operation) which have the same position of the opcode
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* nibbles.
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* A special case are instruction formats with 1-byte opcodes. In this
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* case the byte member always is zero, so that the mask is applied on
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* the (only) byte that contains the opcode.
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*/
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static struct insn_type insn_type_table[] = {
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{
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.byte = 0,
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.mask = 0xff,
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.format = (char *[]) {
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"MII",
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"RR",
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"RS",
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"RSI",
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"RX",
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"SI",
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"SMI",
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"SS",
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NULL,
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},
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},
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{
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.byte = 1,
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.mask = 0x0f,
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.format = (char *[]) {
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"RI",
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"RIL",
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"SSF",
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NULL,
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},
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},
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{
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.byte = 1,
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.mask = 0xff,
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.format = (char *[]) {
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"E",
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"IE",
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"RRE",
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"RRF",
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"RRR",
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"S",
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"SIL",
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"SSE",
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NULL,
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},
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},
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{
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.byte = 5,
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.mask = 0xff,
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.format = (char *[]) {
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"RIE",
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"RIS",
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"RRS",
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"RSE",
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"RSL",
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"RSY",
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"RXE",
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"RXF",
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"RXY",
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"SIY",
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"VRI",
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"VRR",
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"VRS",
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"VRV",
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"VRX",
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"VSI",
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NULL,
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},
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},
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};
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static struct insn_type *insn_format_to_type(char *format)
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{
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char tmp[STRING_SIZE_MAX];
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char *base_format, **ptr;
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int i;
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strcpy(tmp, format);
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base_format = tmp;
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base_format = strsep(&base_format, "_");
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for (i = 0; i < sizeof(insn_type_table) / sizeof(insn_type_table[0]); i++) {
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ptr = insn_type_table[i].format;
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while (*ptr) {
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if (!strcmp(base_format, *ptr))
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return &insn_type_table[i];
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ptr++;
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}
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}
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exit(EXIT_FAILURE);
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}
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static void read_instructions(struct gen_opcode *desc)
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{
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struct insn insn;
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int rc, i;
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while (1) {
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rc = scanf("%s %s %s", insn.opcode, insn.name, insn.format);
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if (rc == EOF)
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break;
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if (rc != 3)
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exit(EXIT_FAILURE);
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insn.type = insn_format_to_type(insn.format);
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insn.name_len = strlen(insn.name);
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for (i = 0; i <= insn.name_len; i++)
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insn.upper[i] = toupper((unsigned char)insn.name[i]);
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desc->nr++;
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desc->insn = realloc(desc->insn, desc->nr * sizeof(*desc->insn));
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if (!desc->insn)
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exit(EXIT_FAILURE);
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desc->insn[desc->nr - 1] = insn;
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}
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}
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static int cmpformat(const void *a, const void *b)
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{
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return strcmp(((struct insn *)a)->format, ((struct insn *)b)->format);
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}
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static void print_formats(struct gen_opcode *desc)
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{
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char *format;
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int i, count;
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qsort(desc->insn, desc->nr, sizeof(*desc->insn), cmpformat);
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format = "";
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count = 0;
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printf("enum {\n");
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for (i = 0; i < desc->nr; i++) {
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if (!strcmp(format, desc->insn[i].format))
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continue;
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count++;
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format = desc->insn[i].format;
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printf("\tINSTR_%s,\n", format);
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}
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printf("}; /* %d */\n\n", count);
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}
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static int cmp_long_insn(const void *a, const void *b)
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{
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return strcmp(((struct insn *)a)->name, ((struct insn *)b)->name);
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}
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static void print_long_insn(struct gen_opcode *desc)
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{
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struct insn *insn;
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int i, count;
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qsort(desc->insn, desc->nr, sizeof(*desc->insn), cmp_long_insn);
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count = 0;
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printf("enum {\n");
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for (i = 0; i < desc->nr; i++) {
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insn = &desc->insn[i];
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if (insn->name_len < 6)
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continue;
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printf("\tLONG_INSN_%s,\n", insn->upper);
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count++;
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}
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printf("}; /* %d */\n\n", count);
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printf("#define LONG_INSN_INITIALIZER { \\\n");
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for (i = 0; i < desc->nr; i++) {
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insn = &desc->insn[i];
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if (insn->name_len < 6)
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continue;
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printf("\t[LONG_INSN_%s] = \"%s\", \\\n", insn->upper, insn->name);
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}
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printf("}\n\n");
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}
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static void print_opcode(struct insn *insn, int nr)
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{
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char *opcode;
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opcode = insn->opcode;
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if (insn->type->byte != 0)
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opcode += 2;
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printf("\t[%4d] = { .opfrag = 0x%s, .format = INSTR_%s, ", nr, opcode, insn->format);
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if (insn->name_len < 6)
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printf(".name = \"%s\" ", insn->name);
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else
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printf(".offset = LONG_INSN_%s ", insn->upper);
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printf("}, \\\n");
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}
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static void add_to_group(struct gen_opcode *desc, struct insn *insn, int offset)
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{
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struct insn_group *group;
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group = desc->group ? &desc->group[desc->nr_groups - 1] : NULL;
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if (group && (!strncmp(group->opcode, insn->opcode, 2) || group->type->byte == 0)) {
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group->count++;
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return;
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}
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desc->nr_groups++;
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desc->group = realloc(desc->group, desc->nr_groups * sizeof(*desc->group));
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if (!desc->group)
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exit(EXIT_FAILURE);
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group = &desc->group[desc->nr_groups - 1];
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memcpy(group->opcode, insn->opcode, 2);
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group->type = insn->type;
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group->offset = offset;
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group->count = 1;
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}
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static int cmpopcode(const void *a, const void *b)
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{
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return strcmp(((struct insn *)a)->opcode, ((struct insn *)b)->opcode);
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}
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static void print_opcode_table(struct gen_opcode *desc)
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{
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char opcode[2] = "";
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struct insn *insn;
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int i, offset;
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qsort(desc->insn, desc->nr, sizeof(*desc->insn), cmpopcode);
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printf("#define OPCODE_TABLE_INITIALIZER { \\\n");
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offset = 0;
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for (i = 0; i < desc->nr; i++) {
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insn = &desc->insn[i];
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if (insn->type->byte == 0)
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continue;
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add_to_group(desc, insn, offset);
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if (strncmp(opcode, insn->opcode, 2)) {
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memcpy(opcode, insn->opcode, 2);
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printf("\t/* %.2s */ \\\n", opcode);
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}
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print_opcode(insn, offset);
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offset++;
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}
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printf("\t/* 1-byte opcode instructions */ \\\n");
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for (i = 0; i < desc->nr; i++) {
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insn = &desc->insn[i];
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if (insn->type->byte != 0)
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continue;
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add_to_group(desc, insn, offset);
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print_opcode(insn, offset);
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offset++;
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}
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printf("}\n\n");
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}
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static void print_opcode_table_offsets(struct gen_opcode *desc)
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{
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struct insn_group *group;
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int i;
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printf("#define OPCODE_OFFSET_INITIALIZER { \\\n");
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for (i = 0; i < desc->nr_groups; i++) {
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group = &desc->group[i];
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printf("\t{ .opcode = 0x%.2s, .mask = 0x%02x, .byte = %d, .offset = %d, .count = %d }, \\\n",
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group->opcode, group->type->mask, group->type->byte, group->offset, group->count);
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}
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printf("}\n\n");
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}
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int main(int argc, char **argv)
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{
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struct gen_opcode _desc = { 0 };
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struct gen_opcode *desc = &_desc;
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read_instructions(desc);
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printf("#ifndef __S390_GENERATED_DIS_DEFS_H__\n");
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printf("#define __S390_GENERATED_DIS_DEFS_H__\n");
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printf("/*\n");
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printf(" * DO NOT MODIFY.\n");
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printf(" *\n");
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printf(" * This file was generated by %s\n", __FILE__);
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printf(" */\n\n");
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print_formats(desc);
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print_long_insn(desc);
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print_opcode_table(desc);
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print_opcode_table_offsets(desc);
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printf("#endif\n");
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exit(EXIT_SUCCESS);
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}
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