295 lines
7.8 KiB
C
295 lines
7.8 KiB
C
/* Print instructions for the Motorola 88000, for GDB and GNU Binutils.
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Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1993, 1998, 2000, 2001
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "sysdep.h"
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#include "dis-asm.h"
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#include "opcode/m88k.h"
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#include "opintl.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 *, 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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/* Disassemble an M88000 instruction at `memaddr'. */
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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, bfd_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 be used to
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* print the target address if this is a relative jump or call the
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* disassembled instruction is written to `info'.
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*
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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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unsigned int class;
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if (! ihashtab_initialized)
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init_disasm ();
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/* Create 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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* This function formats and writes an operand of an instruction to
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* info based on the operand specification. When the `first' flag is
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* set this is the first operand of an instruction. Undefined operand
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* types 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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* 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 by
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* a comma if it is not the first operand of an instruction and it is
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* 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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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 XREG:
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(*info->fprintf_func) (info->stream, "x%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 DEC:
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extracted_field = UEXT (inst, opptr->offset, opptr->width);
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(*info->fprintf_func) (info->stream, "%d", 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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/* xgettext:c-format */
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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
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* disassembler. This should be called once before the first call to
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* disasm().
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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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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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