1234567891011121314151617181920212223242526272829303132333435363738 |
- /* fix_emu.c: Routines for emulator-specific M68000 code fixup
- Copyright (C) 2003 Sebastian Reichelt
- This program 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 2, or (at your option)
- any later version.
- This program 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
- #include "fix_emu.h"
- #include "emu.h"
- #include "../manip.h"
- // Turn an M68000 absolute JRA/JSR to a program-relative F-Line jump.
- void M68kEmuMakeFLineJump (RELOC *Reloc, I1 *Opcode, BOOLEAN IsJSR)
- {
- if ((Reloc->Size == 4) && (!(Reloc->Relative)))
- {
- // Optimize the JRA or JSR into an F-Line JMP.W or JSR.W.
- Opcode [0] = (IsJSR ? M68K_EMU_JSR_W_0 : M68K_EMU_JMP_W_0);
- Opcode [1] = (IsJSR ? M68K_EMU_JSR_W_1 : M68K_EMU_JMP_W_1);
-
- // Change the reloc to 2-byte program-relative.
- SetRelocProgramRelative (Reloc);
- Reloc->Size = 2;
- Reloc->FixedOffset -= 0x8000;
- }
- }
|