327 lines
7.9 KiB
C
327 lines
7.9 KiB
C
/* Instruction printing code for the OpenRISC 1000
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Copyright (C) 2002, 2005, 2007 Free Software Foundation, Inc.
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Contributed by Damjan Lampret <lampret@opencores.org>.
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Modified from a29k port.
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This file is part of the GNU opcodes library.
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This library 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 3, or (at your option)
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any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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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., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#ifndef DEBUG
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#define DEBUG 0
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#endif
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#include "dis-asm.h"
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#include "opcode/or32.h"
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#include "safe-ctype.h"
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#include <string.h>
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#include <stdlib.h>
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#define EXTEND29(x) ((x) & (unsigned long) 0x10000000 ? ((x) | (unsigned long) 0xf0000000) : ((x)))
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/* Now find the four bytes of INSN_CH and put them in *INSN. */
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static void
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find_bytes_big (unsigned char *insn_ch, unsigned long *insn)
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{
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*insn =
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((unsigned long) insn_ch[0] << 24) +
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((unsigned long) insn_ch[1] << 16) +
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((unsigned long) insn_ch[2] << 8) +
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((unsigned long) insn_ch[3]);
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#if DEBUG
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printf ("find_bytes_big3: %lx\n", *insn);
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#endif
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}
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static void
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find_bytes_little (unsigned char *insn_ch, unsigned long *insn)
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{
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*insn =
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((unsigned long) insn_ch[3] << 24) +
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((unsigned long) insn_ch[2] << 16) +
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((unsigned long) insn_ch[1] << 8) +
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((unsigned long) insn_ch[0]);
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}
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typedef void (*find_byte_func_type) (unsigned char *, unsigned long *);
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static unsigned long
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or32_extract (char param_ch, char *enc_initial, unsigned long insn)
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{
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char *enc;
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unsigned long ret = 0;
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int opc_pos = 0;
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int param_pos = 0;
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for (enc = enc_initial; *enc != '\0'; enc++)
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if (*enc == param_ch)
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{
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if (enc - 2 >= enc_initial && (*(enc - 2) == '0') && (*(enc - 1) == 'x'))
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continue;
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else
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param_pos++;
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}
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#if DEBUG
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printf ("or32_extract: %c %x ", param_ch, param_pos);
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#endif
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opc_pos = 32;
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for (enc = enc_initial; *enc != '\0'; )
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if ((*enc == '0') && (*(enc + 1) == 'x'))
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{
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opc_pos -= 4;
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if ((param_ch == '0') || (param_ch == '1'))
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{
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unsigned long tmp = strtoul (enc, NULL, 16);
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#if DEBUG
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printf (" enc=%s, tmp=%lx ", enc, tmp);
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#endif
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if (param_ch == '0')
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tmp = 15 - tmp;
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ret |= tmp << opc_pos;
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}
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enc += 3;
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}
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else if ((*enc == '0') || (*enc == '1'))
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{
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opc_pos--;
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if (param_ch == *enc)
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ret |= 1 << opc_pos;
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enc++;
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}
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else if (*enc == param_ch)
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{
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opc_pos--;
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param_pos--;
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#if DEBUG
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printf ("\n ret=%lx opc_pos=%x, param_pos=%x\n", ret, opc_pos, param_pos);
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#endif
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ret += ((insn >> opc_pos) & 0x1) << param_pos;
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if (!param_pos
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&& letter_signed (param_ch)
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&& ret >> (letter_range (param_ch) - 1))
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{
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#if DEBUG
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printf ("\n ret=%lx opc_pos=%x, param_pos=%x\n",
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ret, opc_pos, param_pos);
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#endif
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ret |= 0xffffffff << letter_range(param_ch);
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#if DEBUG
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printf ("\n after conversion to signed: ret=%lx\n", ret);
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#endif
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}
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enc++;
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}
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else if (ISALPHA (*enc))
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{
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opc_pos--;
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enc++;
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}
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else if (*enc == '-')
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{
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opc_pos--;
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enc++;
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}
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else
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enc++;
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#if DEBUG
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printf ("ret=%lx\n", ret);
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#endif
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return ret;
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}
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static int
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or32_opcode_match (unsigned long insn, char *encoding)
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{
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unsigned long ones, zeros;
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#if DEBUG
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printf ("or32_opcode_match: %.8lx\n", insn);
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#endif
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ones = or32_extract ('1', encoding, insn);
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zeros = or32_extract ('0', encoding, insn);
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#if DEBUG
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printf ("ones: %lx \n", ones);
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printf ("zeros: %lx \n", zeros);
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#endif
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if ((insn & ones) != ones)
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{
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#if DEBUG
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printf ("ret1\n");
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#endif
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return 0;
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}
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if ((~insn & zeros) != zeros)
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{
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#if DEBUG
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printf ("ret2\n");
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#endif
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return 0;
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}
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#if DEBUG
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printf ("ret3\n");
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#endif
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return 1;
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}
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/* Print register to INFO->STREAM. Used only by print_insn. */
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static void
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or32_print_register (char param_ch,
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char *encoding,
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unsigned long insn,
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struct disassemble_info *info)
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{
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int regnum = or32_extract (param_ch, encoding, insn);
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#if DEBUG
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printf ("or32_print_register: %c, %s, %lx\n", param_ch, encoding, insn);
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#endif
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if (param_ch == 'A')
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(*info->fprintf_func) (info->stream, "r%d", regnum);
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else if (param_ch == 'B')
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(*info->fprintf_func) (info->stream, "r%d", regnum);
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else if (param_ch == 'D')
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(*info->fprintf_func) (info->stream, "r%d", regnum);
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else if (regnum < 16)
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(*info->fprintf_func) (info->stream, "r%d", regnum);
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else if (regnum < 32)
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(*info->fprintf_func) (info->stream, "r%d", regnum-16);
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else
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(*info->fprintf_func) (info->stream, "X%d", regnum);
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}
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/* Print immediate to INFO->STREAM. Used only by print_insn. */
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static void
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or32_print_immediate (char param_ch,
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char *encoding,
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unsigned long insn,
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struct disassemble_info *info)
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{
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int imm = or32_extract(param_ch, encoding, insn);
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if (letter_signed(param_ch))
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(*info->fprintf_func) (info->stream, "0x%x", imm);
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/* (*info->fprintf_func) (info->stream, "%d", imm); */
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else
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(*info->fprintf_func) (info->stream, "0x%x", imm);
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}
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/* Print one instruction from MEMADDR on INFO->STREAM.
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Return the size of the instruction (always 4 on or32). */
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static int
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print_insn (bfd_vma memaddr, struct disassemble_info *info)
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{
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/* The raw instruction. */
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unsigned char insn_ch[4];
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/* Address. Will be sign extened 27-bit. */
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unsigned long addr;
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/* The four bytes of the instruction. */
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unsigned long insn;
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find_byte_func_type find_byte_func = (find_byte_func_type) info->private_data;
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struct or32_opcode const * opcode;
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{
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int status =
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(*info->read_memory_func) (memaddr, (bfd_byte *) &insn_ch[0], 4, info);
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if (status != 0)
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{
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(*info->memory_error_func) (status, memaddr, info);
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return -1;
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}
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}
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(*find_byte_func) (&insn_ch[0], &insn);
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for (opcode = &or32_opcodes[0];
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opcode < &or32_opcodes[or32_num_opcodes];
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++opcode)
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{
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if (or32_opcode_match (insn, opcode->encoding))
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{
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char *s;
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(*info->fprintf_func) (info->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 '\0':
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return 4;
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case 'r':
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or32_print_register (*++s, opcode->encoding, insn, info);
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break;
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case 'X':
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addr = or32_extract ('X', opcode->encoding, insn) << 2;
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/* Calulate the correct address. XXX is this really correct ?? */
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addr = memaddr + EXTEND29 (addr);
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(*info->print_address_func)
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(addr, info);
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break;
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default:
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if (strchr (opcode->encoding, *s))
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or32_print_immediate (*s, opcode->encoding, insn, info);
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else
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(*info->fprintf_func) (info->stream, "%c", *s);
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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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/* This used to be %8x for binutils. */
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(*info->fprintf_func)
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(info->stream, ".word 0x%08lx", insn);
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return 4;
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}
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/* Disassemble a big-endian or32 instruction. */
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int
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print_insn_big_or32 (bfd_vma memaddr, struct disassemble_info *info)
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{
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info->private_data = find_bytes_big;
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return print_insn (memaddr, info);
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}
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/* Disassemble a little-endian or32 instruction. */
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int
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print_insn_little_or32 (bfd_vma memaddr, struct disassemble_info *info)
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{
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info->private_data = find_bytes_little;
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return print_insn (memaddr, info);
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}
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