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/* |
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* mon_disass.cpp - Disassemblers |
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* |
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* cxmon (C) 1997-2000 Christian Bauer, Marc Hellwig |
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* |
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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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* |
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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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* |
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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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*/ |
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|
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#include "sysdeps.h" |
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|
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#include <stdarg.h> |
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|
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#include "mon.h" |
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#include "mon_disass.h" |
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|
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#include "mon_atraps.h" |
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#include "mon_lowmem.h" |
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|
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|
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// Flag: enable MacOS A-Trap and LM globals lookup in 68k disassembler |
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bool mon_macos_mode = false; |
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|
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|
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/* |
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* GNU disassembler callbacks |
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*/ |
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|
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extern "C" { |
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#include "disass/dis-asm.h" |
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|
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int buffer_read_memory(bfd_vma from, bfd_byte *to, int length, struct disassemble_info *info) |
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{ |
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while (length--) |
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*to++ = mon_read_byte(from++); |
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return 0; |
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} |
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|
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void perror_memory(int status, bfd_vma memaddr, struct disassemble_info *info) |
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{ |
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info->fprintf_func(info->stream, "Unknown error %d\n", status); |
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} |
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|
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bool lookup_lowmem; |
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|
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void generic_print_address(bfd_vma addr, struct disassemble_info *info) |
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{ |
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if (lookup_lowmem && addr >= 0x100 && addr < 0x3000) { |
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if (((addr >= 0x400 && addr < 0x800) || (addr >= 0xe00 && addr < 0x1e00)) && ((addr & 3) == 0)) { |
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// Look for address in A-Trap table |
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uint16 opcode = (addr < 0xe00 ? 0xa000 + (addr - 0x400) / 4 : 0xa800 + (addr - 0xe00) / 4); |
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uint16 mask = (addr < 0xe00 ? 0xf8ff : 0xffff); |
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const atrap_info *p = atraps; |
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while (p->word) { |
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if ((p->word & mask) == opcode) { |
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info->fprintf_func(info->stream, p->name); |
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return; |
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} |
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p++; |
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} |
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} else { |
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// Look for address in low memory globals table |
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const lowmem_info *p = lowmem; |
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while (p->name) { |
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if (addr >= p[0].addr && addr < p[1].addr) { |
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if (addr == p[0].addr) |
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info->fprintf_func(info->stream, "%s", p->name); |
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else |
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info->fprintf_func(info->stream, "%s+%d", p->name, addr - p->addr); |
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return; |
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} |
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p++; |
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} |
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} |
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} |
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info->fprintf_func(info->stream, "$%08x", addr); |
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} |
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|
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int generic_symbol_at_address(bfd_vma addr, struct disassemble_info *info) |
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{ |
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return 0; |
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} |
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|
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void print_68k_invalid_opcode(unsigned long opcode, struct disassemble_info *info) |
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{ |
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if (mon_macos_mode) { |
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// Look for MacOS A-Trap |
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const atrap_info *p = atraps; |
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while (p->word) { |
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if (p->word == opcode) { |
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info->fprintf_func(info->stream, p->name); |
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return; |
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} |
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p++; |
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} |
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} |
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info->fprintf_func(info->stream, "?"); |
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} |
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|
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}; |
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|
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|
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/* |
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* sprintf into a "stream" |
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*/ |
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|
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struct SFILE { |
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char *buffer; |
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char *current; |
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}; |
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|
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static int mon_sprintf(SFILE *f, const char *format, ...) |
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{ |
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int n; |
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va_list args; |
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va_start(args, format); |
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vsprintf(f->current, format, args); |
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f->current += n = strlen(f->current); |
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va_end(args); |
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return n; |
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} |
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|
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|
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/* |
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* Disassemble one instruction, return number of bytes |
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*/ |
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|
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int disass_68k(FILE *f, uint32 adr) |
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{ |
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// Initialize info for GDB disassembler |
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disassemble_info info; |
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char buf[1024]; |
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SFILE sfile = {buf, buf}; |
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sfile.buffer = buf; |
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sfile.current = buf; |
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INIT_DISASSEMBLE_INFO(info, (FILE *)&sfile, (fprintf_ftype)mon_sprintf); |
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|
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// Disassemble instruction |
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lookup_lowmem = mon_macos_mode; |
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int num = print_insn_m68k(adr, &info); |
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|
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for (int i=0; i<6; i+=2) { |
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if (num > i) |
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fprintf(f, "%04x ", mon_read_half(adr + i)); |
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else |
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fprintf(f, " "); |
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} |
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if (num == 8) |
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fprintf(f, "%04x\t%s\n", mon_read_half(adr + 6), buf); |
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else if (num > 8) |
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fprintf(f, "...\t%s\n", buf); |
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else |
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fprintf(f, " \t%s\n", buf); |
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|
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return num; |
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} |
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|
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int disass_x86(FILE *f, uint32 adr, bool i8086) |
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{ |
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// Initialize info for GDB disassembler |
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disassemble_info info; |
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char buf[1024]; |
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SFILE sfile = {buf, buf}; |
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sfile.buffer = buf; |
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sfile.current = buf; |
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INIT_DISASSEMBLE_INFO(info, (FILE *)&sfile, (fprintf_ftype)mon_sprintf); |
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if (i8086) |
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info.mach = bfd_mach_i386_i8086; |
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|
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// Disassemble instruction |
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lookup_lowmem = false; |
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int num = print_insn_i386(adr, &info); |
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|
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for (int i=0; i<6; i++) { |
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if (num > i) |
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fprintf(f, "%02x ", mon_read_byte(adr + i)); |
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else |
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fprintf(f, " "); |
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} |
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if (num == 7) |
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fprintf(f, "%02x\t%s\n", mon_read_byte(adr + 7), buf); |
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else if (num > 7) |
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fprintf(f, "..\t%s\n", buf); |
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else |
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fprintf(f, " \t%s\n", buf); |
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|
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return num; |
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} |
