303 lines
7.8 KiB
C
303 lines
7.8 KiB
C
/* Instruction printing code for the AMD 29000
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Copyright (C) 1990 Free Software Foundation, Inc.
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Contributed by Cygnus Support. Written by Jim Kingdon.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include "defs.h"
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#include "target.h"
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#include "am29k-opcode.h"
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/* Print a symbolic representation of a general-purpose
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register number NUM on STREAM.
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NUM is a number as found in the instruction, not as found in
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debugging symbols; it must be in the range 0-255. */
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static void
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print_general (num, stream)
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int num;
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FILE *stream;
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{
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if (num < 128)
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fprintf_filtered (stream, "gr%d", num);
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else
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fprintf_filtered (stream, "lr%d", num - 128);
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}
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/* Like print_general but a special-purpose register.
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The mnemonics used by the AMD assembler are not quite the same
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as the ones in the User's Manual. We use the ones that the
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assembler uses. */
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static void
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print_special (num, stream)
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int num;
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FILE *stream;
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{
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/* Register names of registers 0-SPEC0_NUM-1. */
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static char *spec0_names[] = {
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"vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr",
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"pc0", "pc1", "pc2", "mmu", "lru"
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};
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#define SPEC0_NUM ((sizeof spec0_names) / (sizeof spec0_names[0]))
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/* Register names of registers 128-128+SPEC128_NUM-1. */
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static char *spec128_names[] = {
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"ipc", "ipa", "ipb", "q", "alu", "bp", "fc", "cr"
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};
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#define SPEC128_NUM ((sizeof spec128_names) / (sizeof spec128_names[0]))
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/* Register names of registers 160-160+SPEC160_NUM-1. */
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static char *spec160_names[] = {
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"fpe", "inte", "fps", "sr163", "exop"
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};
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#define SPEC160_NUM ((sizeof spec160_names) / (sizeof spec160_names[0]))
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if (num < SPEC0_NUM)
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fprintf_filtered (stream, spec0_names[num]);
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else if (num >= 128 && num < 128 + SPEC128_NUM)
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fprintf_filtered (stream, spec128_names[num-128]);
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else if (num >= 160 && num < 160 + SPEC160_NUM)
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fprintf_filtered (stream, spec160_names[num-160]);
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else
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fprintf_filtered (stream, "sr%d", num);
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}
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/* Is an instruction with OPCODE a delayed branch? */
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static int
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is_delayed_branch (opcode)
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int opcode;
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{
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return (opcode == 0xa8 || opcode == 0xa9 || opcode == 0xa0 || opcode == 0xa1
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|| opcode == 0xa4 || opcode == 0xa5
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|| opcode == 0xb4 || opcode == 0xb5
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|| opcode == 0xc4 || opcode == 0xc0
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|| opcode == 0xac || opcode == 0xad
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|| opcode == 0xcc);
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}
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/* Now find the four bytes of INSN and put them in *INSN{0,8,16,24}.
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Note that the amd can be set up as either
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big or little-endian (the tm file says which) and we can't assume
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the host machine is the same. */
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static void
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find_bytes (insn, insn0, insn8, insn16, insn24)
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char *insn;
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unsigned char *insn0;
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unsigned char *insn8;
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unsigned char *insn16;
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unsigned char *insn24;
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{
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#if TARGET_BYTE_ORDER == BIG_ENDIAN
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*insn24 = insn[0];
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*insn16 = insn[1];
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*insn8 = insn[2];
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*insn0 = insn[3];
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#else /* Little-endian. */
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*insn24 = insn[3];
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*insn16 = insn[2];
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*insn8 = insn[1];
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*insn0 = insn[0];
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#endif /* Little-endian. */
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}
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/* Print one instruction from MEMADDR on STREAM.
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Return the size of the instruction (always 4 on am29k). */
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int
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print_insn (memaddr, stream)
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CORE_ADDR memaddr;
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FILE *stream;
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{
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/* The raw instruction. */
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char insn[4];
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/* The four bytes of the instruction. */
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unsigned char insn24, insn16, insn8, insn0;
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struct am29k_opcode *opcode;
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read_memory (memaddr, &insn[0], 4);
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find_bytes (insn, &insn0, &insn8, &insn16, &insn24);
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/* Handle the nop (aseq 0x40,gr1,gr1) specially */
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if ((insn24==0x70) && (insn16==0x40) && (insn8==0x01) && (insn0==0x01)) {
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fprintf_filtered (stream,"nop");
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return 4;
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}
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/* The opcode is always in insn24. */
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for (opcode = &am29k_opcodes[0];
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opcode < &am29k_opcodes[NUM_OPCODES];
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++opcode)
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{
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if (insn24 == opcode->opcode)
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{
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char *s;
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fprintf_filtered (stream, "%s ", opcode->name);
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for (s = opcode->args; *s != '\0'; ++s)
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{
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switch (*s)
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{
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case 'a':
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print_general (insn8, stream);
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break;
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case 'b':
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print_general (insn0, stream);
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break;
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case 'c':
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print_general (insn16, stream);
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break;
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case 'i':
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fprintf_filtered (stream, "%d", insn0);
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break;
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case 'x':
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fprintf_filtered (stream, "%d", (insn16 << 8) + insn0);
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break;
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case 'h':
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fprintf_filtered (stream, "0x%x",
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(insn16 << 24) + (insn0 << 16));
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break;
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case 'X':
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fprintf_filtered (stream, "%d",
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((insn16 << 8) + insn0) | 0xffff0000);
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break;
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case 'P':
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/* This output looks just like absolute addressing, but
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maybe that's OK (it's what the GDB 68k and EBMON
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29k disassemblers do). */
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/* All the shifting is to sign-extend it. p*/
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print_address
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(memaddr +
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(((int)((insn16 << 10) + (insn0 << 2)) << 14) >> 14),
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stream);
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break;
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case 'A':
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print_address ((insn16 << 10) + (insn0 << 2), stream);
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break;
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case 'e':
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fprintf_filtered (stream, "%d", insn16 >> 7);
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break;
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case 'n':
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fprintf_filtered (stream, "0x%x", insn16 & 0x7f);
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break;
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case 'v':
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fprintf_filtered (stream, "0x%x", insn16);
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break;
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case 's':
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print_special (insn8, stream);
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break;
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case 'u':
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fprintf_filtered (stream, "%d", insn0 >> 7);
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break;
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case 'r':
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fprintf_filtered (stream, "%d", (insn0 >> 4) & 7);
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break;
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case 'd':
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fprintf_filtered (stream, "%d", (insn0 >> 2) & 3);
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break;
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case 'f':
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fprintf_filtered (stream, "%d", insn0 & 3);
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break;
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case 'F':
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fprintf_filtered (stream, "%d", (insn16 >> 2) & 15);
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break;
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case 'C':
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fprintf_filtered (stream, "%d", insn16 & 3);
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break;
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default:
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fprintf_filtered (stream, "%c", *s);
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}
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}
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/* Now we look for a const,consth pair of instructions,
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in which case we try to print the symbolic address. */
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if (insn24 == 2) /* consth */
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{
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int errcode;
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char prev_insn[4];
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unsigned char prev_insn0, prev_insn8, prev_insn16, prev_insn24;
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errcode = target_read_memory (memaddr - 4,
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&prev_insn[0],
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4);
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if (errcode == 0)
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{
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/* If it is a delayed branch, we need to look at the
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instruction before the delayed brach to handle
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things like
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const _foo
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call _printf
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consth _foo
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*/
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find_bytes (prev_insn, &prev_insn0, &prev_insn8,
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&prev_insn16, &prev_insn24);
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if (is_delayed_branch (prev_insn24))
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{
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errcode = target_read_memory
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(memaddr - 8, &prev_insn[0], 4);
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find_bytes (prev_insn, &prev_insn0, &prev_insn8,
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&prev_insn16, &prev_insn24);
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}
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}
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/* If there was a problem reading memory, then assume
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the previous instruction was not const. */
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if (errcode == 0)
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{
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/* Is it const to the same register? */
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if (prev_insn24 == 3
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&& prev_insn8 == insn8)
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{
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fprintf_filtered (stream, "\t; ");
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print_address (((insn16 << 24) + (insn0 << 16)
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+ (prev_insn16 << 8) + (prev_insn0)),
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stream);
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}
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}
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}
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return 4;
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}
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}
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fprintf_filtered (stream, ".word 0x%8x",
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(insn24 << 24) + (insn16 << 16) + (insn8 << 8) + insn0);
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return 4;
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}
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