/* Target dependent code for the Motorola 68000 series.
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/* Target dependent code for the Motorola 68000 series.
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Copyright (C) 1990, 1992, 1993, 1994, 1995, 1996, 1999, 2000
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Copyright (C) 1990, 1992, 1993, 1994, 1995, 1996, 1999, 2000
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Free Software Foundation, Inc.
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Free Software Foundation, Inc.
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This file is part of GDB.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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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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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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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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(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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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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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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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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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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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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "defs.h"
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#include "frame.h"
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#include "frame.h"
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#include "symtab.h"
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#include "symtab.h"
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#include "gdbcore.h"
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#include "gdbcore.h"
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#include "value.h"
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#include "value.h"
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#include "gdb_string.h"
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#include "gdb_string.h"
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#include "inferior.h"
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#include "inferior.h"
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#define P_LINKL_FP 0x480e
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#define P_LINKL_FP 0x480e
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#define P_LINKW_FP 0x4e56
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#define P_LINKW_FP 0x4e56
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#define P_PEA_FP 0x4856
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#define P_PEA_FP 0x4856
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#define P_MOVL_SP_FP 0x2c4f
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#define P_MOVL_SP_FP 0x2c4f
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#define P_MOVL 0x207c
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#define P_MOVL 0x207c
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#define P_JSR 0x4eb9
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#define P_JSR 0x4eb9
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#define P_BSR 0x61ff
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#define P_BSR 0x61ff
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#define P_LEAL 0x43fb
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#define P_LEAL 0x43fb
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#define P_MOVML 0x48ef
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#define P_MOVML 0x48ef
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#define P_FMOVM 0xf237
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#define P_FMOVM 0xf237
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#define P_TRAP 0x4e40
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#define P_TRAP 0x4e40
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/* The only reason this is here is the tm-altos.h reference below. It
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/* The only reason this is here is the tm-altos.h reference below. It
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was moved back here from tm-m68k.h. FIXME? */
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was moved back here from tm-m68k.h. FIXME? */
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extern CORE_ADDR
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extern CORE_ADDR
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altos_skip_prologue (pc)
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altos_skip_prologue (pc)
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CORE_ADDR pc;
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CORE_ADDR pc;
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{
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{
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register int op = read_memory_integer (pc, 2);
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register int op = read_memory_integer (pc, 2);
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if (op == P_LINKW_FP)
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if (op == P_LINKW_FP)
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pc += 4; /* Skip link #word */
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pc += 4; /* Skip link #word */
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else if (op == P_LINKL_FP)
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else if (op == P_LINKL_FP)
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pc += 6; /* Skip link #long */
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pc += 6; /* Skip link #long */
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/* Not sure why branches are here. */
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/* Not sure why branches are here. */
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/* From tm-isi.h, tm-altos.h */
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/* From tm-isi.h, tm-altos.h */
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else if (op == 0060000)
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else if (op == 0060000)
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pc += 4; /* Skip bra #word */
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pc += 4; /* Skip bra #word */
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else if (op == 00600377)
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else if (op == 00600377)
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pc += 6; /* skip bra #long */
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pc += 6; /* skip bra #long */
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else if ((op & 0177400) == 0060000)
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else if ((op & 0177400) == 0060000)
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pc += 2; /* skip bra #char */
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pc += 2; /* skip bra #char */
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return pc;
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return pc;
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}
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}
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/* The only reason this is here is the tm-isi.h reference below. It
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/* The only reason this is here is the tm-isi.h reference below. It
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was moved back here from tm-m68k.h. FIXME? */
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was moved back here from tm-m68k.h. FIXME? */
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extern CORE_ADDR
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extern CORE_ADDR
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isi_skip_prologue (pc)
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isi_skip_prologue (pc)
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CORE_ADDR pc;
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CORE_ADDR pc;
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{
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{
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register int op = read_memory_integer (pc, 2);
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register int op = read_memory_integer (pc, 2);
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if (op == P_LINKW_FP)
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if (op == P_LINKW_FP)
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pc += 4; /* Skip link #word */
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pc += 4; /* Skip link #word */
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else if (op == P_LINKL_FP)
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else if (op == P_LINKL_FP)
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pc += 6; /* Skip link #long */
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pc += 6; /* Skip link #long */
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/* Not sure why branches are here. */
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/* Not sure why branches are here. */
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/* From tm-isi.h, tm-altos.h */
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/* From tm-isi.h, tm-altos.h */
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else if (op == 0060000)
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else if (op == 0060000)
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pc += 4; /* Skip bra #word */
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pc += 4; /* Skip bra #word */
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else if (op == 00600377)
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else if (op == 00600377)
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pc += 6; /* skip bra #long */
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pc += 6; /* skip bra #long */
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else if ((op & 0177400) == 0060000)
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else if ((op & 0177400) == 0060000)
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pc += 2; /* skip bra #char */
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pc += 2; /* skip bra #char */
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return pc;
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return pc;
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}
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}
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int
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int
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delta68_in_sigtramp (pc, name)
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delta68_in_sigtramp (pc, name)
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CORE_ADDR pc;
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CORE_ADDR pc;
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char *name;
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char *name;
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{
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{
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if (name != NULL)
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if (name != NULL)
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return strcmp (name, "_sigcode") == 0;
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return strcmp (name, "_sigcode") == 0;
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else
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else
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return 0;
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return 0;
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}
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}
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CORE_ADDR
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CORE_ADDR
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delta68_frame_args_address (frame_info)
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delta68_frame_args_address (frame_info)
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struct frame_info * frame_info;
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struct frame_info * frame_info;
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{
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{
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/* we assume here that the only frameless functions are the system calls
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/* we assume here that the only frameless functions are the system calls
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or other functions who do not put anything on the stack. */
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or other functions who do not put anything on the stack. */
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if (frame_info->signal_handler_caller)
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if (frame_info->signal_handler_caller)
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return frame_info->frame + 12;
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return frame_info->frame + 12;
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else if (frameless_look_for_prologue (frame_info))
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else if (frameless_look_for_prologue (frame_info))
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{
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{
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/* Check for an interrupted system call */
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/* Check for an interrupted system call */
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if (frame_info->next && frame_info->next->signal_handler_caller)
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if (frame_info->next && frame_info->next->signal_handler_caller)
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return frame_info->next->frame + 16;
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return frame_info->next->frame + 16;
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else
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else
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return frame_info->frame + 4;
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return frame_info->frame + 4;
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}
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}
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else
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else
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return frame_info->frame;
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return frame_info->frame;
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}
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}
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CORE_ADDR
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CORE_ADDR
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delta68_frame_saved_pc (frame_info)
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delta68_frame_saved_pc (frame_info)
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struct frame_info * frame_info;
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struct frame_info * frame_info;
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{
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{
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return read_memory_integer (delta68_frame_args_address (frame_info) + 4, 4);
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return read_memory_integer (delta68_frame_args_address (frame_info) + 4, 4);
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}
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}
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/* Return number of args passed to a frame.
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/* Return number of args passed to a frame.
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Can return -1, meaning no way to tell. */
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Can return -1, meaning no way to tell. */
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int
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int
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isi_frame_num_args (fi)
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isi_frame_num_args (fi)
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struct frame_info *fi;
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struct frame_info *fi;
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{
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{
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int val;
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int val;
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CORE_ADDR pc = FRAME_SAVED_PC (fi);
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CORE_ADDR pc = FRAME_SAVED_PC (fi);
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int insn = 0177777 & read_memory_integer (pc, 2);
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int insn = 0177777 & read_memory_integer (pc, 2);
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val = 0;
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val = 0;
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if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
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if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
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val = read_memory_integer (pc + 2, 2);
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val = read_memory_integer (pc + 2, 2);
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else if ((insn & 0170777) == 0050217 /* addql #N, sp */
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else if ((insn & 0170777) == 0050217 /* addql #N, sp */
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|| (insn & 0170777) == 0050117) /* addqw */
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|| (insn & 0170777) == 0050117) /* addqw */
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{
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{
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val = (insn >> 9) & 7;
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val = (insn >> 9) & 7;
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if (val == 0)
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if (val == 0)
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val = 8;
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val = 8;
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}
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}
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else if (insn == 0157774) /* addal #WW, sp */
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else if (insn == 0157774) /* addal #WW, sp */
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val = read_memory_integer (pc + 2, 4);
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val = read_memory_integer (pc + 2, 4);
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val >>= 2;
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val >>= 2;
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return val;
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return val;
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}
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}
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int
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int
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delta68_frame_num_args (fi)
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delta68_frame_num_args (fi)
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struct frame_info *fi;
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struct frame_info *fi;
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{
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{
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int val;
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int val;
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CORE_ADDR pc = FRAME_SAVED_PC (fi);
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CORE_ADDR pc = FRAME_SAVED_PC (fi);
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int insn = 0177777 & read_memory_integer (pc, 2);
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int insn = 0177777 & read_memory_integer (pc, 2);
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val = 0;
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val = 0;
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if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
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if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
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val = read_memory_integer (pc + 2, 2);
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val = read_memory_integer (pc + 2, 2);
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else if ((insn & 0170777) == 0050217 /* addql #N, sp */
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else if ((insn & 0170777) == 0050217 /* addql #N, sp */
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|| (insn & 0170777) == 0050117) /* addqw */
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|| (insn & 0170777) == 0050117) /* addqw */
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{
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{
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val = (insn >> 9) & 7;
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val = (insn >> 9) & 7;
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if (val == 0)
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if (val == 0)
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val = 8;
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val = 8;
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}
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}
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else if (insn == 0157774) /* addal #WW, sp */
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else if (insn == 0157774) /* addal #WW, sp */
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val = read_memory_integer (pc + 2, 4);
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val = read_memory_integer (pc + 2, 4);
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val >>= 2;
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val >>= 2;
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return val;
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return val;
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}
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}
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int
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int
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news_frame_num_args (fi)
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news_frame_num_args (fi)
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struct frame_info *fi;
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struct frame_info *fi;
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{
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{
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int val;
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int val;
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CORE_ADDR pc = FRAME_SAVED_PC (fi);
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CORE_ADDR pc = FRAME_SAVED_PC (fi);
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int insn = 0177777 & read_memory_integer (pc, 2);
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int insn = 0177777 & read_memory_integer (pc, 2);
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val = 0;
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val = 0;
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if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
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if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
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val = read_memory_integer (pc + 2, 2);
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val = read_memory_integer (pc + 2, 2);
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else if ((insn & 0170777) == 0050217 /* addql #N, sp */
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else if ((insn & 0170777) == 0050217 /* addql #N, sp */
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|| (insn & 0170777) == 0050117) /* addqw */
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|| (insn & 0170777) == 0050117) /* addqw */
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{
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{
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val = (insn >> 9) & 7;
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val = (insn >> 9) & 7;
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if (val == 0)
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if (val == 0)
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val = 8;
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val = 8;
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}
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}
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else if (insn == 0157774) /* addal #WW, sp */
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else if (insn == 0157774) /* addal #WW, sp */
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val = read_memory_integer (pc + 2, 4);
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val = read_memory_integer (pc + 2, 4);
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val >>= 2;
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val >>= 2;
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return val;
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return val;
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}
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}
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/* Push an empty stack frame, to record the current PC, etc. */
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/* Push an empty stack frame, to record the current PC, etc. */
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void
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void
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m68k_push_dummy_frame ()
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m68k_push_dummy_frame ()
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{
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{
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register CORE_ADDR sp = read_register (SP_REGNUM);
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register CORE_ADDR sp = read_register (SP_REGNUM);
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register int regnum;
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register int regnum;
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char raw_buffer[12];
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char raw_buffer[12];
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sp = push_word (sp, read_register (PC_REGNUM));
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sp = push_word (sp, read_register (PC_REGNUM));
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sp = push_word (sp, read_register (FP_REGNUM));
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sp = push_word (sp, read_register (FP_REGNUM));
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write_register (FP_REGNUM, sp);
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write_register (FP_REGNUM, sp);
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/* Always save the floating-point registers, whether they exist on
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/* Always save the floating-point registers, whether they exist on
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this target or not. */
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this target or not. */
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for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)
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for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)
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{
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{
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read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);
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read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);
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sp = push_bytes (sp, raw_buffer, 12);
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sp = push_bytes (sp, raw_buffer, 12);
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}
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}
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for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)
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for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)
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{
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{
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sp = push_word (sp, read_register (regnum));
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sp = push_word (sp, read_register (regnum));
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}
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}
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sp = push_word (sp, read_register (PS_REGNUM));
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sp = push_word (sp, read_register (PS_REGNUM));
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write_register (SP_REGNUM, sp);
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write_register (SP_REGNUM, sp);
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}
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}
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/* Discard from the stack the innermost frame,
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/* Discard from the stack the innermost frame,
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restoring all saved registers. */
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restoring all saved registers. */
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void
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void
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m68k_pop_frame ()
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m68k_pop_frame ()
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{
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{
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register struct frame_info *frame = get_current_frame ();
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register struct frame_info *frame = get_current_frame ();
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register CORE_ADDR fp;
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register CORE_ADDR fp;
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register int regnum;
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register int regnum;
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struct frame_saved_regs fsr;
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struct frame_saved_regs fsr;
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char raw_buffer[12];
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char raw_buffer[12];
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fp = FRAME_FP (frame);
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fp = FRAME_FP (frame);
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get_frame_saved_regs (frame, &fsr);
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get_frame_saved_regs (frame, &fsr);
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for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)
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for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)
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{
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{
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if (fsr.regs[regnum])
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if (fsr.regs[regnum])
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{
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{
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read_memory (fsr.regs[regnum], raw_buffer, 12);
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read_memory (fsr.regs[regnum], raw_buffer, 12);
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write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);
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write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);
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}
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}
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}
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}
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for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)
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for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)
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{
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{
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if (fsr.regs[regnum])
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if (fsr.regs[regnum])
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{
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{
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write_register (regnum, read_memory_integer (fsr.regs[regnum], 4));
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write_register (regnum, read_memory_integer (fsr.regs[regnum], 4));
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}
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}
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}
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}
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if (fsr.regs[PS_REGNUM])
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if (fsr.regs[PS_REGNUM])
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{
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{
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write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4));
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write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4));
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}
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}
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write_register (FP_REGNUM, read_memory_integer (fp, 4));
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write_register (FP_REGNUM, read_memory_integer (fp, 4));
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write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));
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write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));
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write_register (SP_REGNUM, fp + 8);
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write_register (SP_REGNUM, fp + 8);
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flush_cached_frames ();
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flush_cached_frames ();
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}
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}
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|
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/* Given an ip value corresponding to the start of a function,
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/* Given an ip value corresponding to the start of a function,
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return the ip of the first instruction after the function
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return the ip of the first instruction after the function
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prologue. This is the generic m68k support. Machines which
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prologue. This is the generic m68k support. Machines which
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require something different can override the SKIP_PROLOGUE
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require something different can override the SKIP_PROLOGUE
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macro to point elsewhere.
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macro to point elsewhere.
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|
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Some instructions which typically may appear in a function
|
Some instructions which typically may appear in a function
|
prologue include:
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prologue include:
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|
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A link instruction, word form:
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A link instruction, word form:
|
|
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link.w %a6,&0 4e56 XXXX
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link.w %a6,&0 4e56 XXXX
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|
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A link instruction, long form:
|
A link instruction, long form:
|
|
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link.l %fp,&F%1 480e XXXX XXXX
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link.l %fp,&F%1 480e XXXX XXXX
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|
|
A movm instruction to preserve integer regs:
|
A movm instruction to preserve integer regs:
|
|
|
movm.l &M%1,(4,%sp) 48ef XXXX XXXX
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movm.l &M%1,(4,%sp) 48ef XXXX XXXX
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|
|
A fmovm instruction to preserve float regs:
|
A fmovm instruction to preserve float regs:
|
|
|
fmovm &FPM%1,(FPO%1,%sp) f237 XXXX XXXX XXXX XXXX
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fmovm &FPM%1,(FPO%1,%sp) f237 XXXX XXXX XXXX XXXX
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|
|
Some profiling setup code (FIXME, not recognized yet):
|
Some profiling setup code (FIXME, not recognized yet):
|
|
|
lea.l (.L3,%pc),%a1 43fb XXXX XXXX XXXX
|
lea.l (.L3,%pc),%a1 43fb XXXX XXXX XXXX
|
bsr _mcount 61ff XXXX XXXX
|
bsr _mcount 61ff XXXX XXXX
|
|
|
*/
|
*/
|
|
|
CORE_ADDR
|
CORE_ADDR
|
m68k_skip_prologue (ip)
|
m68k_skip_prologue (ip)
|
CORE_ADDR ip;
|
CORE_ADDR ip;
|
{
|
{
|
register CORE_ADDR limit;
|
register CORE_ADDR limit;
|
struct symtab_and_line sal;
|
struct symtab_and_line sal;
|
register int op;
|
register int op;
|
|
|
/* Find out if there is a known limit for the extent of the prologue.
|
/* Find out if there is a known limit for the extent of the prologue.
|
If so, ensure we don't go past it. If not, assume "infinity". */
|
If so, ensure we don't go past it. If not, assume "infinity". */
|
|
|
sal = find_pc_line (ip, 0);
|
sal = find_pc_line (ip, 0);
|
limit = (sal.end) ? sal.end : (CORE_ADDR) ~ 0;
|
limit = (sal.end) ? sal.end : (CORE_ADDR) ~ 0;
|
|
|
while (ip < limit)
|
while (ip < limit)
|
{
|
{
|
op = read_memory_integer (ip, 2);
|
op = read_memory_integer (ip, 2);
|
op &= 0xFFFF;
|
op &= 0xFFFF;
|
|
|
if (op == P_LINKW_FP)
|
if (op == P_LINKW_FP)
|
ip += 4; /* Skip link.w */
|
ip += 4; /* Skip link.w */
|
else if (op == P_PEA_FP)
|
else if (op == P_PEA_FP)
|
ip += 2; /* Skip pea %fp */
|
ip += 2; /* Skip pea %fp */
|
else if (op == P_MOVL_SP_FP)
|
else if (op == P_MOVL_SP_FP)
|
ip += 2; /* Skip move.l %sp, %fp */
|
ip += 2; /* Skip move.l %sp, %fp */
|
else if (op == P_LINKL_FP)
|
else if (op == P_LINKL_FP)
|
ip += 6; /* Skip link.l */
|
ip += 6; /* Skip link.l */
|
else if (op == P_MOVML)
|
else if (op == P_MOVML)
|
ip += 6; /* Skip movm.l */
|
ip += 6; /* Skip movm.l */
|
else if (op == P_FMOVM)
|
else if (op == P_FMOVM)
|
ip += 10; /* Skip fmovm */
|
ip += 10; /* Skip fmovm */
|
else
|
else
|
break; /* Found unknown code, bail out. */
|
break; /* Found unknown code, bail out. */
|
}
|
}
|
return (ip);
|
return (ip);
|
}
|
}
|
|
|
void
|
void
|
m68k_find_saved_regs (frame_info, saved_regs)
|
m68k_find_saved_regs (frame_info, saved_regs)
|
struct frame_info *frame_info;
|
struct frame_info *frame_info;
|
struct frame_saved_regs *saved_regs;
|
struct frame_saved_regs *saved_regs;
|
{
|
{
|
register int regnum;
|
register int regnum;
|
register int regmask;
|
register int regmask;
|
register CORE_ADDR next_addr;
|
register CORE_ADDR next_addr;
|
register CORE_ADDR pc;
|
register CORE_ADDR pc;
|
|
|
/* First possible address for a pc in a call dummy for this frame. */
|
/* First possible address for a pc in a call dummy for this frame. */
|
CORE_ADDR possible_call_dummy_start =
|
CORE_ADDR possible_call_dummy_start =
|
(frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4 - 8 * 12;
|
(frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4 - 8 * 12;
|
|
|
int nextinsn;
|
int nextinsn;
|
memset (saved_regs, 0, sizeof (*saved_regs));
|
memset (saved_regs, 0, sizeof (*saved_regs));
|
if ((frame_info)->pc >= possible_call_dummy_start
|
if ((frame_info)->pc >= possible_call_dummy_start
|
&& (frame_info)->pc <= (frame_info)->frame)
|
&& (frame_info)->pc <= (frame_info)->frame)
|
{
|
{
|
|
|
/* It is a call dummy. We could just stop now, since we know
|
/* It is a call dummy. We could just stop now, since we know
|
what the call dummy saves and where. But this code proceeds
|
what the call dummy saves and where. But this code proceeds
|
to parse the "prologue" which is part of the call dummy.
|
to parse the "prologue" which is part of the call dummy.
|
This is needlessly complex and confusing. FIXME. */
|
This is needlessly complex and confusing. FIXME. */
|
|
|
next_addr = (frame_info)->frame;
|
next_addr = (frame_info)->frame;
|
pc = possible_call_dummy_start;
|
pc = possible_call_dummy_start;
|
}
|
}
|
else
|
else
|
{
|
{
|
pc = get_pc_function_start ((frame_info)->pc);
|
pc = get_pc_function_start ((frame_info)->pc);
|
|
|
nextinsn = read_memory_integer (pc, 2);
|
nextinsn = read_memory_integer (pc, 2);
|
if (P_PEA_FP == nextinsn
|
if (P_PEA_FP == nextinsn
|
&& P_MOVL_SP_FP == read_memory_integer (pc + 2, 2))
|
&& P_MOVL_SP_FP == read_memory_integer (pc + 2, 2))
|
{
|
{
|
/* pea %fp
|
/* pea %fp
|
move.l %sp, %fp */
|
move.l %sp, %fp */
|
next_addr = frame_info->frame;
|
next_addr = frame_info->frame;
|
pc += 4;
|
pc += 4;
|
}
|
}
|
else if (P_LINKL_FP == nextinsn)
|
else if (P_LINKL_FP == nextinsn)
|
/* link.l %fp */
|
/* link.l %fp */
|
/* Find the address above the saved
|
/* Find the address above the saved
|
regs using the amount of storage from the link instruction. */
|
regs using the amount of storage from the link instruction. */
|
{
|
{
|
next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 4);
|
next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 4);
|
pc += 6;
|
pc += 6;
|
}
|
}
|
else if (P_LINKW_FP == nextinsn)
|
else if (P_LINKW_FP == nextinsn)
|
/* link.w %fp */
|
/* link.w %fp */
|
/* Find the address above the saved
|
/* Find the address above the saved
|
regs using the amount of storage from the link instruction. */
|
regs using the amount of storage from the link instruction. */
|
{
|
{
|
next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 2);
|
next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 2);
|
pc += 4;
|
pc += 4;
|
}
|
}
|
else
|
else
|
goto lose;
|
goto lose;
|
|
|
/* If have an addal #-n, sp next, adjust next_addr. */
|
/* If have an addal #-n, sp next, adjust next_addr. */
|
if ((0177777 & read_memory_integer (pc, 2)) == 0157774)
|
if ((0177777 & read_memory_integer (pc, 2)) == 0157774)
|
next_addr += read_memory_integer (pc += 2, 4), pc += 4;
|
next_addr += read_memory_integer (pc += 2, 4), pc += 4;
|
}
|
}
|
|
|
for ( ; ; )
|
for ( ; ; )
|
{
|
{
|
nextinsn = 0xffff & read_memory_integer (pc, 2);
|
nextinsn = 0xffff & read_memory_integer (pc, 2);
|
regmask = read_memory_integer (pc + 2, 2);
|
regmask = read_memory_integer (pc + 2, 2);
|
/* fmovemx to -(sp) */
|
/* fmovemx to -(sp) */
|
if (0xf227 == nextinsn && (regmask & 0xff00) == 0xe000)
|
if (0xf227 == nextinsn && (regmask & 0xff00) == 0xe000)
|
{
|
{
|
/* Regmask's low bit is for register fp7, the first pushed */
|
/* Regmask's low bit is for register fp7, the first pushed */
|
for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
|
for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
|
if (regmask & 1)
|
if (regmask & 1)
|
saved_regs->regs[regnum] = (next_addr -= 12);
|
saved_regs->regs[regnum] = (next_addr -= 12);
|
pc += 4;
|
pc += 4;
|
}
|
}
|
/* fmovemx to (fp + displacement) */
|
/* fmovemx to (fp + displacement) */
|
else if (0171056 == nextinsn && (regmask & 0xff00) == 0xf000)
|
else if (0171056 == nextinsn && (regmask & 0xff00) == 0xf000)
|
{
|
{
|
register CORE_ADDR addr;
|
register CORE_ADDR addr;
|
|
|
addr = (frame_info)->frame + read_memory_integer (pc + 4, 2);
|
addr = (frame_info)->frame + read_memory_integer (pc + 4, 2);
|
/* Regmask's low bit is for register fp7, the first pushed */
|
/* Regmask's low bit is for register fp7, the first pushed */
|
for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
|
for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
|
if (regmask & 1)
|
if (regmask & 1)
|
{
|
{
|
saved_regs->regs[regnum] = addr;
|
saved_regs->regs[regnum] = addr;
|
addr += 12;
|
addr += 12;
|
}
|
}
|
pc += 6;
|
pc += 6;
|
}
|
}
|
/* moveml to (sp) */
|
/* moveml to (sp) */
|
else if (0044327 == nextinsn)
|
else if (0044327 == nextinsn)
|
{
|
{
|
/* Regmask's low bit is for register 0, the first written */
|
/* Regmask's low bit is for register 0, the first written */
|
for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)
|
for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)
|
if (regmask & 1)
|
if (regmask & 1)
|
{
|
{
|
saved_regs->regs[regnum] = next_addr;
|
saved_regs->regs[regnum] = next_addr;
|
next_addr += 4;
|
next_addr += 4;
|
}
|
}
|
pc += 4;
|
pc += 4;
|
}
|
}
|
/* moveml to (fp + displacement) */
|
/* moveml to (fp + displacement) */
|
else if (0044356 == nextinsn)
|
else if (0044356 == nextinsn)
|
{
|
{
|
register CORE_ADDR addr;
|
register CORE_ADDR addr;
|
|
|
addr = (frame_info)->frame + read_memory_integer (pc + 4, 2);
|
addr = (frame_info)->frame + read_memory_integer (pc + 4, 2);
|
/* Regmask's low bit is for register 0, the first written */
|
/* Regmask's low bit is for register 0, the first written */
|
for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)
|
for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)
|
if (regmask & 1)
|
if (regmask & 1)
|
{
|
{
|
saved_regs->regs[regnum] = addr;
|
saved_regs->regs[regnum] = addr;
|
addr += 4;
|
addr += 4;
|
}
|
}
|
pc += 6;
|
pc += 6;
|
}
|
}
|
/* moveml to -(sp) */
|
/* moveml to -(sp) */
|
else if (0044347 == nextinsn)
|
else if (0044347 == nextinsn)
|
{
|
{
|
/* Regmask's low bit is for register 15, the first pushed */
|
/* Regmask's low bit is for register 15, the first pushed */
|
for (regnum = 16; --regnum >= 0; regmask >>= 1)
|
for (regnum = 16; --regnum >= 0; regmask >>= 1)
|
if (regmask & 1)
|
if (regmask & 1)
|
saved_regs->regs[regnum] = (next_addr -= 4);
|
saved_regs->regs[regnum] = (next_addr -= 4);
|
pc += 4;
|
pc += 4;
|
}
|
}
|
/* movl r,-(sp) */
|
/* movl r,-(sp) */
|
else if (0x2f00 == (0xfff0 & nextinsn))
|
else if (0x2f00 == (0xfff0 & nextinsn))
|
{
|
{
|
regnum = 0xf & nextinsn;
|
regnum = 0xf & nextinsn;
|
saved_regs->regs[regnum] = (next_addr -= 4);
|
saved_regs->regs[regnum] = (next_addr -= 4);
|
pc += 2;
|
pc += 2;
|
}
|
}
|
/* fmovemx to index of sp */
|
/* fmovemx to index of sp */
|
else if (0xf236 == nextinsn && (regmask & 0xff00) == 0xf000)
|
else if (0xf236 == nextinsn && (regmask & 0xff00) == 0xf000)
|
{
|
{
|
/* Regmask's low bit is for register fp0, the first written */
|
/* Regmask's low bit is for register fp0, the first written */
|
for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
|
for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
|
if (regmask & 1)
|
if (regmask & 1)
|
{
|
{
|
saved_regs->regs[regnum] = next_addr;
|
saved_regs->regs[regnum] = next_addr;
|
next_addr += 12;
|
next_addr += 12;
|
}
|
}
|
pc += 10;
|
pc += 10;
|
}
|
}
|
/* clrw -(sp); movw ccr,-(sp) */
|
/* clrw -(sp); movw ccr,-(sp) */
|
else if (0x4267 == nextinsn && 0x42e7 == regmask)
|
else if (0x4267 == nextinsn && 0x42e7 == regmask)
|
{
|
{
|
saved_regs->regs[PS_REGNUM] = (next_addr -= 4);
|
saved_regs->regs[PS_REGNUM] = (next_addr -= 4);
|
pc += 4;
|
pc += 4;
|
}
|
}
|
else
|
else
|
break;
|
break;
|
}
|
}
|
lose:;
|
lose:;
|
saved_regs->regs[SP_REGNUM] = (frame_info)->frame + 8;
|
saved_regs->regs[SP_REGNUM] = (frame_info)->frame + 8;
|
saved_regs->regs[FP_REGNUM] = (frame_info)->frame;
|
saved_regs->regs[FP_REGNUM] = (frame_info)->frame;
|
saved_regs->regs[PC_REGNUM] = (frame_info)->frame + 4;
|
saved_regs->regs[PC_REGNUM] = (frame_info)->frame + 4;
|
#ifdef SIG_SP_FP_OFFSET
|
#ifdef SIG_SP_FP_OFFSET
|
/* Adjust saved SP_REGNUM for fake _sigtramp frames. */
|
/* Adjust saved SP_REGNUM for fake _sigtramp frames. */
|
if (frame_info->signal_handler_caller && frame_info->next)
|
if (frame_info->signal_handler_caller && frame_info->next)
|
saved_regs->regs[SP_REGNUM] = frame_info->next->frame + SIG_SP_FP_OFFSET;
|
saved_regs->regs[SP_REGNUM] = frame_info->next->frame + SIG_SP_FP_OFFSET;
|
#endif
|
#endif
|
}
|
}
|
|
|
|
|
#ifdef USE_PROC_FS /* Target dependent support for /proc */
|
#ifdef USE_PROC_FS /* Target dependent support for /proc */
|
|
|
#include <sys/procfs.h>
|
#include <sys/procfs.h>
|
|
|
/* The /proc interface divides the target machine's register set up into
|
/* The /proc interface divides the target machine's register set up into
|
two different sets, the general register set (gregset) and the floating
|
two different sets, the general register set (gregset) and the floating
|
point register set (fpregset). For each set, there is an ioctl to get
|
point register set (fpregset). For each set, there is an ioctl to get
|
the current register set and another ioctl to set the current values.
|
the current register set and another ioctl to set the current values.
|
|
|
The actual structure passed through the ioctl interface is, of course,
|
The actual structure passed through the ioctl interface is, of course,
|
naturally machine dependent, and is different for each set of registers.
|
naturally machine dependent, and is different for each set of registers.
|
For the m68k for example, the general register set is typically defined
|
For the m68k for example, the general register set is typically defined
|
by:
|
by:
|
|
|
typedef int gregset_t[18];
|
typedef int gregset_t[18];
|
|
|
#define R_D0 0
|
#define R_D0 0
|
...
|
...
|
#define R_PS 17
|
#define R_PS 17
|
|
|
and the floating point set by:
|
and the floating point set by:
|
|
|
typedef struct fpregset {
|
typedef struct fpregset {
|
int f_pcr;
|
int f_pcr;
|
int f_psr;
|
int f_psr;
|
int f_fpiaddr;
|
int f_fpiaddr;
|
int f_fpregs[8][3]; (8 regs, 96 bits each)
|
int f_fpregs[8][3]; (8 regs, 96 bits each)
|
} fpregset_t;
|
} fpregset_t;
|
|
|
These routines provide the packing and unpacking of gregset_t and
|
These routines provide the packing and unpacking of gregset_t and
|
fpregset_t formatted data.
|
fpregset_t formatted data.
|
|
|
*/
|
*/
|
|
|
/* Atari SVR4 has R_SR but not R_PS */
|
/* Atari SVR4 has R_SR but not R_PS */
|
|
|
#if !defined (R_PS) && defined (R_SR)
|
#if !defined (R_PS) && defined (R_SR)
|
#define R_PS R_SR
|
#define R_PS R_SR
|
#endif
|
#endif
|
|
|
/* Given a pointer to a general register set in /proc format (gregset_t *),
|
/* Given a pointer to a general register set in /proc format (gregset_t *),
|
unpack the register contents and supply them as gdb's idea of the current
|
unpack the register contents and supply them as gdb's idea of the current
|
register values. */
|
register values. */
|
|
|
void
|
void
|
supply_gregset (gregsetp)
|
supply_gregset (gregsetp)
|
gregset_t *gregsetp;
|
gregset_t *gregsetp;
|
{
|
{
|
register int regi;
|
register int regi;
|
register greg_t *regp = (greg_t *) gregsetp;
|
register greg_t *regp = (greg_t *) gregsetp;
|
|
|
for (regi = 0; regi < R_PC; regi++)
|
for (regi = 0; regi < R_PC; regi++)
|
{
|
{
|
supply_register (regi, (char *) (regp + regi));
|
supply_register (regi, (char *) (regp + regi));
|
}
|
}
|
supply_register (PS_REGNUM, (char *) (regp + R_PS));
|
supply_register (PS_REGNUM, (char *) (regp + R_PS));
|
supply_register (PC_REGNUM, (char *) (regp + R_PC));
|
supply_register (PC_REGNUM, (char *) (regp + R_PC));
|
}
|
}
|
|
|
void
|
void
|
fill_gregset (gregsetp, regno)
|
fill_gregset (gregsetp, regno)
|
gregset_t *gregsetp;
|
gregset_t *gregsetp;
|
int regno;
|
int regno;
|
{
|
{
|
register int regi;
|
register int regi;
|
register greg_t *regp = (greg_t *) gregsetp;
|
register greg_t *regp = (greg_t *) gregsetp;
|
|
|
for (regi = 0; regi < R_PC; regi++)
|
for (regi = 0; regi < R_PC; regi++)
|
{
|
{
|
if ((regno == -1) || (regno == regi))
|
if ((regno == -1) || (regno == regi))
|
{
|
{
|
*(regp + regi) = *(int *) ®isters[REGISTER_BYTE (regi)];
|
*(regp + regi) = *(int *) ®isters[REGISTER_BYTE (regi)];
|
}
|
}
|
}
|
}
|
if ((regno == -1) || (regno == PS_REGNUM))
|
if ((regno == -1) || (regno == PS_REGNUM))
|
{
|
{
|
*(regp + R_PS) = *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)];
|
*(regp + R_PS) = *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)];
|
}
|
}
|
if ((regno == -1) || (regno == PC_REGNUM))
|
if ((regno == -1) || (regno == PC_REGNUM))
|
{
|
{
|
*(regp + R_PC) = *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)];
|
*(regp + R_PC) = *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)];
|
}
|
}
|
}
|
}
|
|
|
#if defined (FP0_REGNUM)
|
#if defined (FP0_REGNUM)
|
|
|
/* Given a pointer to a floating point register set in /proc format
|
/* Given a pointer to a floating point register set in /proc format
|
(fpregset_t *), unpack the register contents and supply them as gdb's
|
(fpregset_t *), unpack the register contents and supply them as gdb's
|
idea of the current floating point register values. */
|
idea of the current floating point register values. */
|
|
|
void
|
void
|
supply_fpregset (fpregsetp)
|
supply_fpregset (fpregsetp)
|
fpregset_t *fpregsetp;
|
fpregset_t *fpregsetp;
|
{
|
{
|
register int regi;
|
register int regi;
|
char *from;
|
char *from;
|
|
|
for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++)
|
for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++)
|
{
|
{
|
from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]);
|
from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]);
|
supply_register (regi, from);
|
supply_register (regi, from);
|
}
|
}
|
supply_register (FPC_REGNUM, (char *) &(fpregsetp->f_pcr));
|
supply_register (FPC_REGNUM, (char *) &(fpregsetp->f_pcr));
|
supply_register (FPS_REGNUM, (char *) &(fpregsetp->f_psr));
|
supply_register (FPS_REGNUM, (char *) &(fpregsetp->f_psr));
|
supply_register (FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr));
|
supply_register (FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr));
|
}
|
}
|
|
|
/* Given a pointer to a floating point register set in /proc format
|
/* Given a pointer to a floating point register set in /proc format
|
(fpregset_t *), update the register specified by REGNO from gdb's idea
|
(fpregset_t *), update the register specified by REGNO from gdb's idea
|
of the current floating point register set. If REGNO is -1, update
|
of the current floating point register set. If REGNO is -1, update
|
them all. */
|
them all. */
|
|
|
void
|
void
|
fill_fpregset (fpregsetp, regno)
|
fill_fpregset (fpregsetp, regno)
|
fpregset_t *fpregsetp;
|
fpregset_t *fpregsetp;
|
int regno;
|
int regno;
|
{
|
{
|
int regi;
|
int regi;
|
char *to;
|
char *to;
|
char *from;
|
char *from;
|
|
|
for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++)
|
for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++)
|
{
|
{
|
if ((regno == -1) || (regno == regi))
|
if ((regno == -1) || (regno == regi))
|
{
|
{
|
from = (char *) ®isters[REGISTER_BYTE (regi)];
|
from = (char *) ®isters[REGISTER_BYTE (regi)];
|
to = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]);
|
to = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]);
|
memcpy (to, from, REGISTER_RAW_SIZE (regi));
|
memcpy (to, from, REGISTER_RAW_SIZE (regi));
|
}
|
}
|
}
|
}
|
if ((regno == -1) || (regno == FPC_REGNUM))
|
if ((regno == -1) || (regno == FPC_REGNUM))
|
{
|
{
|
fpregsetp->f_pcr = *(int *) ®isters[REGISTER_BYTE (FPC_REGNUM)];
|
fpregsetp->f_pcr = *(int *) ®isters[REGISTER_BYTE (FPC_REGNUM)];
|
}
|
}
|
if ((regno == -1) || (regno == FPS_REGNUM))
|
if ((regno == -1) || (regno == FPS_REGNUM))
|
{
|
{
|
fpregsetp->f_psr = *(int *) ®isters[REGISTER_BYTE (FPS_REGNUM)];
|
fpregsetp->f_psr = *(int *) ®isters[REGISTER_BYTE (FPS_REGNUM)];
|
}
|
}
|
if ((regno == -1) || (regno == FPI_REGNUM))
|
if ((regno == -1) || (regno == FPI_REGNUM))
|
{
|
{
|
fpregsetp->f_fpiaddr = *(int *) ®isters[REGISTER_BYTE (FPI_REGNUM)];
|
fpregsetp->f_fpiaddr = *(int *) ®isters[REGISTER_BYTE (FPI_REGNUM)];
|
}
|
}
|
}
|
}
|
|
|
#endif /* defined (FP0_REGNUM) */
|
#endif /* defined (FP0_REGNUM) */
|
|
|
#endif /* USE_PROC_FS */
|
#endif /* USE_PROC_FS */
|
|
|
#ifdef GET_LONGJMP_TARGET
|
#ifdef GET_LONGJMP_TARGET
|
/* Figure out where the longjmp will land. Slurp the args out of the stack.
|
/* Figure out where the longjmp will land. Slurp the args out of the stack.
|
We expect the first arg to be a pointer to the jmp_buf structure from which
|
We expect the first arg to be a pointer to the jmp_buf structure from which
|
we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
|
we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
|
This routine returns true on success. */
|
This routine returns true on success. */
|
|
|
int
|
int
|
get_longjmp_target (pc)
|
get_longjmp_target (pc)
|
CORE_ADDR *pc;
|
CORE_ADDR *pc;
|
{
|
{
|
char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
|
char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
|
CORE_ADDR sp, jb_addr;
|
CORE_ADDR sp, jb_addr;
|
|
|
sp = read_register (SP_REGNUM);
|
sp = read_register (SP_REGNUM);
|
|
|
if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */
|
if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */
|
buf,
|
buf,
|
TARGET_PTR_BIT / TARGET_CHAR_BIT))
|
TARGET_PTR_BIT / TARGET_CHAR_BIT))
|
return 0;
|
return 0;
|
|
|
jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
|
jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
|
|
|
if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
|
if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
|
TARGET_PTR_BIT / TARGET_CHAR_BIT))
|
TARGET_PTR_BIT / TARGET_CHAR_BIT))
|
return 0;
|
return 0;
|
|
|
*pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
|
*pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
|
|
|
return 1;
|
return 1;
|
}
|
}
|
#endif /* GET_LONGJMP_TARGET */
|
#endif /* GET_LONGJMP_TARGET */
|
|
|
/* Immediately after a function call, return the saved pc before the frame
|
/* Immediately after a function call, return the saved pc before the frame
|
is setup. For sun3's, we check for the common case of being inside of a
|
is setup. For sun3's, we check for the common case of being inside of a
|
system call, and if so, we know that Sun pushes the call # on the stack
|
system call, and if so, we know that Sun pushes the call # on the stack
|
prior to doing the trap. */
|
prior to doing the trap. */
|
|
|
CORE_ADDR
|
CORE_ADDR
|
m68k_saved_pc_after_call (frame)
|
m68k_saved_pc_after_call (frame)
|
struct frame_info *frame;
|
struct frame_info *frame;
|
{
|
{
|
#ifdef SYSCALL_TRAP
|
#ifdef SYSCALL_TRAP
|
int op;
|
int op;
|
|
|
op = read_memory_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2);
|
op = read_memory_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2);
|
|
|
if (op == SYSCALL_TRAP)
|
if (op == SYSCALL_TRAP)
|
return read_memory_integer (read_register (SP_REGNUM) + 4, 4);
|
return read_memory_integer (read_register (SP_REGNUM) + 4, 4);
|
else
|
else
|
#endif /* SYSCALL_TRAP */
|
#endif /* SYSCALL_TRAP */
|
return read_memory_integer (read_register (SP_REGNUM), 4);
|
return read_memory_integer (read_register (SP_REGNUM), 4);
|
}
|
}
|
|
|
|
|
void
|
void
|
_initialize_m68k_tdep ()
|
_initialize_m68k_tdep ()
|
{
|
{
|
tm_print_insn = print_insn_m68k;
|
tm_print_insn = print_insn_m68k;
|
}
|
}
|
|
|
