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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.2/] [opcodes/] [pj-dis.c] - Rev 438
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/* pj-dis.c -- Disassemble picoJava instructions. Copyright 1999, 2000, 2001, 2002, 2005, 2007 Free Software Foundation, Inc. Contributed by Steve Chamberlain, of Transmeta (sac@pobox.com). This file is part of the GNU opcodes library. This library is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. It is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include <stdio.h> #include "sysdep.h" #include "opcode/pj.h" #include "dis-asm.h" extern const pj_opc_info_t pj_opc_info[512]; static int get_int (bfd_vma memaddr, int *iptr, struct disassemble_info *info) { unsigned char ival[4]; int status = info->read_memory_func (memaddr, ival, 4, info); *iptr = (ival[0] << 24) | (ival[1] << 16) | (ival[2] << 8) | (ival[3] << 0); return status; } int print_insn_pj (bfd_vma addr, struct disassemble_info *info) { fprintf_ftype fprintf_fn = info->fprintf_func; void *stream = info->stream; unsigned char opcode; int status; if ((status = info->read_memory_func (addr, &opcode, 1, info))) goto fail; if (opcode == 0xff) { unsigned char byte_2; if ((status = info->read_memory_func (addr + 1, &byte_2, 1, info))) goto fail; fprintf_fn (stream, "%s\t", pj_opc_info[opcode + byte_2].u.name); return 2; } else { char *sep = "\t"; int insn_start = addr; const pj_opc_info_t *op = &pj_opc_info[opcode]; int a; addr++; fprintf_fn (stream, "%s", op->u.name); /* The tableswitch instruction is followed by the default address, low value, high value and the destinations. */ if (strcmp (op->u.name, "tableswitch") == 0) { int lowval; int highval; int val; addr = (addr + 3) & ~3; if ((status = get_int (addr, &val, info))) goto fail; fprintf_fn (stream, " default: "); (*info->print_address_func) (val + insn_start, info); addr += 4; if ((status = get_int (addr, &lowval, info))) goto fail; addr += 4; if ((status = get_int (addr, &highval, info))) goto fail; addr += 4; while (lowval <= highval) { if ((status = get_int (addr, &val, info))) goto fail; fprintf_fn (stream, " %d:[", lowval); (*info->print_address_func) (val + insn_start, info); fprintf_fn (stream, " ]"); addr += 4; lowval++; } return addr - insn_start; } /* The lookupswitch instruction is followed by the default address, element count and pairs of values and addresses. */ if (strcmp (op->u.name, "lookupswitch") == 0) { int count; int val; addr = (addr + 3) & ~3; if ((status = get_int (addr, &val, info))) goto fail; addr += 4; fprintf_fn (stream, " default: "); (*info->print_address_func) (val + insn_start, info); if ((status = get_int (addr, &count, info))) goto fail; addr += 4; while (count--) { if ((status = get_int (addr, &val, info))) goto fail; addr += 4; fprintf_fn (stream, " %d:[", val); if ((status = get_int (addr, &val, info))) goto fail; addr += 4; (*info->print_address_func) (val + insn_start, info); fprintf_fn (stream, " ]"); } return addr - insn_start; } for (a = 0; op->arg[a]; a++) { unsigned char data[4]; int val = 0; int i; int size = ASIZE (op->arg[a]); if ((status = info->read_memory_func (addr, data, size, info))) goto fail; val = (UNS (op->arg[0]) || ((data[0] & 0x80) == 0)) ? 0 : -1; for (i = 0; i < size; i++) val = (val << 8) | (data[i] & 0xff); if (PCREL (op->arg[a])) (*info->print_address_func) (val + insn_start, info); else fprintf_fn (stream, "%s%d", sep, val); sep = ","; addr += size; } return op->len; } fail: info->memory_error_func (status, addr, info); return -1; }
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