108 lines
4.0 KiB
C
108 lines
4.0 KiB
C
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/* Parameters for execution on a Sun, for GDB, the GNU debugger.
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Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
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This file is part of GDB.
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GDB 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 1, or (at your option)
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any later version.
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GDB 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 GDB; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "m-68k.h"
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/* Define this if the C compiler puts an underscore at the front
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of external names before giving them to the linker. */
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#define NAMES_HAVE_UNDERSCORE
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/* Debugger information will be in DBX format. */
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#define READ_DBX_FORMAT
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/* Address of the end of stack space. We get this from the system
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include files. */
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#include <sys/types.h>
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#include <machine/vmparam.h>
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#define STACK_END_ADDR USRSTACK
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/* Things needed for making the inferior call functions. */
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/* Push an empty stack frame, to record the current PC, etc. */
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#define PUSH_DUMMY_FRAME \
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{ register CORE_ADDR sp = read_register (SP_REGNUM);\
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register int 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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write_register (FP_REGNUM, sp); \
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for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \
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sp = push_word (sp, read_register (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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/* Discard from the stack the innermost frame, restoring all registers. */
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#define POP_FRAME \
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{ register FRAME frame = get_current_frame (); \
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register CORE_ADDR fp; \
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register int regnum; \
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struct frame_saved_regs fsr; \
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struct frame_info *fi; \
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fi = get_frame_info (frame); \
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fp = fi->frame; \
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get_frame_saved_regs (fi, &fsr); \
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for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \
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if (fsr.regs[regnum]) \
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write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
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if (fsr.regs[PS_REGNUM]) \
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write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 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 (SP_REGNUM, fp + 8); \
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flush_cached_frames (); \
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set_current_frame ( create_new_frame (read_register (FP_REGNUM),\
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read_pc ())); }
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/* This sequence of words is the instructions
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moveml 0xfffc,-(sp)
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clrw -(sp)
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movew ccr,-(sp)
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/..* The arguments are pushed at this point by GDB;
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no code is needed in the dummy for this.
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The CALL_DUMMY_START_OFFSET gives the position of
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the following jsr instruction. *../
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jsr @#32323232
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addl #69696969,sp
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bpt
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nop
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Note this is 24 bytes.
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We actually start executing at the jsr, since the pushing of the
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registers is done by PUSH_DUMMY_FRAME. If this were real code,
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the arguments for the function called by the jsr would be pushed
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between the moveml and the jsr, and we could allow it to execute through.
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But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done,
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and we cannot allow the moveml to push the registers again lest they be
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taken for the arguments. */
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#define CALL_DUMMY {0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4f4e71}
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#define CALL_DUMMY_LENGTH 24
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#define CALL_DUMMY_START_OFFSET 8
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/* Insert the specified number of args and function address
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into a call sequence of the above form stored at DUMMYNAME. */
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#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
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{ *(int *)((char *) dummyname + 16) = nargs * 4; \
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*(int *)((char *) dummyname + 10) = fun; }
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