322 lines
8.4 KiB
C
322 lines
8.4 KiB
C
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/* Print instructions for the Motorola 88000, for GDB and GNU Binutils.
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Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1993
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Free Software Foundation, Inc.
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Contributed by Data General Corporation, November 1989.
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Partially derived from an earlier printcmd.c.
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This file is part of GDB and the GNU Binutils.
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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 "dis-asm.h"
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#include "opcode/m88k.h"
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/* FIXME: Uses the internal bfd swapping routines. */
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#include "libbfd.h"
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INSTAB *hashtable[HASHVAL] = {0};
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static int
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m88kdis PARAMS ((bfd_vma, unsigned long, struct disassemble_info *));
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static void
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printop PARAMS ((struct disassemble_info *, OPSPEC *,
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unsigned long, bfd_vma, int));
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static void
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init_disasm PARAMS ((void));
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static void
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install PARAMS ((INSTAB *instptr));
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/*
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* Disassemble an M88000 Instruction
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*
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*
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* This module decodes the instruction at memaddr.
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*
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* Revision History
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*
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* Revision 1.0 11/08/85 Creation date by Motorola
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* 05/11/89 R. Trawick adapted to GDB interface.
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* 07/12/93 Ian Lance Taylor updated to
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* binutils interface.
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*/
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int
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print_insn_m88k (memaddr, info)
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bfd_vma memaddr;
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struct disassemble_info *info;
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{
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bfd_byte buffer[4];
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int status;
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/* Instruction addresses may have low two bits set. Clear them. */
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memaddr &=~ (bfd_vma) 3;
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status = (*info->read_memory_func) (memaddr, buffer, 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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return m88kdis (memaddr, _do_getb32 (buffer), info);
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}
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/*
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* disassemble the instruction in 'instruction'.
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* 'pc' should be the address of this instruction, it will
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* be used to print the target address if this is a relative jump or call
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* the disassembled instruction is written to 'info'.
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* The function returns the length of this instruction in bytes.
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*/
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static int
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m88kdis (pc, instruction, info)
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bfd_vma pc;
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unsigned long instruction;
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struct disassemble_info *info;
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{
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static int ihashtab_initialized = 0;
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unsigned int opcode;
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INSTAB *entry_ptr;
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int opmask;
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int class;
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if (! ihashtab_initialized)
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init_disasm ();
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/* create a the appropriate mask to isolate the opcode */
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opmask = DEFMASK;
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class = instruction & DEFMASK;
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if ((class >= SFU0) && (class <= SFU7))
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{
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if (instruction < SFU1)
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opmask = CTRLMASK;
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else
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opmask = SFUMASK;
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}
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else if (class == RRR)
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opmask = RRRMASK;
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else if (class == RRI10)
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opmask = RRI10MASK;
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/* isolate the opcode */
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opcode = instruction & opmask;
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/* search the hash table with the isolated opcode */
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for (entry_ptr = hashtable[opcode % HASHVAL];
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(entry_ptr != NULL) && (entry_ptr->opcode != opcode);
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entry_ptr = entry_ptr->next)
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;
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if (entry_ptr == NULL)
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(*info->fprintf_func) (info->stream, "word\t%08x", instruction);
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else
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{
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(*info->fprintf_func) (info->stream, "%s ", entry_ptr->mnemonic);
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printop (info, &(entry_ptr->op1), instruction, pc, 1);
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printop (info, &(entry_ptr->op2), instruction, pc, 0);
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printop (info, &(entry_ptr->op3), instruction, pc, 0);
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}
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return 4;
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}
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/*
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* Decode an Operand of an Instruction
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*
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* Functional Description
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*
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* This module formats and writes an operand of an instruction to info
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* based on the operand specification. When the first flag is set this
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* is the first operand of an instruction. Undefined operand types
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* cause a <dis error> message.
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*
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* Parameters
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* disassemble_info where the operand may be printed
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* OPSPEC *opptr Pointer to an operand specification
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* UINT inst Instruction from which operand is extracted
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* UINT pc PC of instruction; used for pc-relative disp.
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* int first Flag which if nonzero indicates the first
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* operand of an instruction
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*
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* Output
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*
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* The operand specified is extracted from the instruction and is
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* written to buf in the format specified. The operand is preceded
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* by a comma if it is not the first operand of an instruction and it
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* is not a register indirect form. Registers are preceded by 'r' and
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* hex values by '0x'.
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*
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* Revision History
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*
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* Revision 1.0 11/08/85 Creation date
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*/
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static void
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printop (info, opptr, inst, pc, first)
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struct disassemble_info *info;
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OPSPEC *opptr;
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unsigned long inst;
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bfd_vma pc;
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int first;
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{
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int extracted_field;
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char *cond_mask_sym;
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if (opptr->width == 0)
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return;
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if (! first)
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{
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switch (opptr->type)
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{
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case REGSC:
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case CONT:
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break;
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default:
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(*info->fprintf_func) (info->stream, ",");
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break;
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}
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}
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switch (opptr->type)
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{
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case CRREG:
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(*info->fprintf_func) (info->stream, "cr%d",
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UEXT (inst, opptr->offset, opptr->width));
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break;
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case FCRREG:
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(*info->fprintf_func) (info->stream, "fcr%d",
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UEXT (inst, opptr->offset, opptr->width));
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break;
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case REGSC:
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(*info->fprintf_func) (info->stream, "[r%d]",
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UEXT (inst, opptr->offset, opptr->width));
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break;
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case REG:
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(*info->fprintf_func) (info->stream, "r%d",
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UEXT (inst, opptr->offset, opptr->width));
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break;
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case HEX:
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extracted_field = UEXT (inst, opptr->offset, opptr->width);
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if (extracted_field == 0)
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(*info->fprintf_func) (info->stream, "0");
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else
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(*info->fprintf_func) (info->stream, "0x%02x", extracted_field);
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break;
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case CONDMASK:
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extracted_field = UEXT (inst, opptr->offset, opptr->width);
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switch (extracted_field & 0x0f)
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{
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case 0x1: cond_mask_sym = "gt0"; break;
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case 0x2: cond_mask_sym = "eq0"; break;
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case 0x3: cond_mask_sym = "ge0"; break;
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case 0xc: cond_mask_sym = "lt0"; break;
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case 0xd: cond_mask_sym = "ne0"; break;
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case 0xe: cond_mask_sym = "le0"; break;
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default: cond_mask_sym = NULL; break;
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}
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if (cond_mask_sym != NULL)
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(*info->fprintf_func) (info->stream, "%s", cond_mask_sym);
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else
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(*info->fprintf_func) (info->stream, "%x", extracted_field);
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break;
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case PCREL:
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(*info->print_address_func)
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(pc + (4 * (SEXT (inst, opptr->offset, opptr->width))),
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info);
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break;
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case CONT:
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(*info->fprintf_func) (info->stream, "%d,r%d",
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UEXT (inst, opptr->offset, 5),
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UEXT (inst, (opptr->offset) + 5, 5));
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break;
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case BF:
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(*info->fprintf_func) (info->stream, "%d<%d>",
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UEXT (inst, (opptr->offset) + 5, 5),
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UEXT (inst, opptr->offset, 5));
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break;
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default:
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(*info->fprintf_func) (info->stream, "# <dis error: %08x>", inst);
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}
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}
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/*
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* Initialize the Disassembler Instruction Table
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*
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* Initialize the hash table and instruction table for the disassembler.
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* This should be called once before the first call to disasm().
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*
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* Parameters
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*
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* Output
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*
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* If the debug option is selected, certain statistics about the hashing
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* distribution are written to stdout.
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*
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* Revision History
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*
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* Revision 1.0 11/08/85 Creation date
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*/
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static void
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init_disasm ()
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{
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int i, size;
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for (i = 0; i < HASHVAL; i++)
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hashtable[i] = NULL;
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size = sizeof (instructions) / sizeof (INSTAB);
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for (i = 0; i < size; i++)
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install (&instructions[i]);
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}
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/*
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* Insert an instruction into the disassembler table by hashing the
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* opcode and inserting it into the linked list for that hash value.
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*
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* Parameters
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*
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* INSTAB *instptr Pointer to the entry in the instruction table
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* to be installed
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*
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* Revision 1.0 11/08/85 Creation date
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* 05/11/89 R. TRAWICK ADAPTED FROM MOTOROLA
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*/
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static void
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install (instptr)
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INSTAB *instptr;
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{
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unsigned int i;
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i = (instptr->opcode) % HASHVAL;
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instptr->next = hashtable[i];
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hashtable[i] = instptr;
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}
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