[deliverable/binutils-gdb.git] / gdb / tm-altos.h

/* Definitions to make GDB run on an Altos 3068 (m68k running SVR2)
   Copyright (C) 1987,1989 Free Software Foundation, Inc.

This file is part of GDB.

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 of the License, 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* Sequence of bytes for breakpoint instruction.  */

#define BREAKPOINT {0x4e, 0x4e}

/* Define this if the C compiler puts an underscore at the front
   of external names before giving them to the linker.  */

#undef NAMES_HAVE_UNDERSCORE

/* Exec files and symbol tables are in COFF format */

#define COFF_FORMAT
#define COFF_NO_LONG_FILE_NAMES

/* Address of end of stack space.  */

/*#define STACK_END_ADDR (0xffffff)*/
#define STACK_END_ADDR (0x1000000)

/* Amount PC must be decremented by after a breakpoint.
   This is often the number of bytes in BREAKPOINT
   but not always.
   On the Altos, the kernel resets the pc to the trap instr */

#define DECR_PC_AFTER_BREAK 0

\f
/* Things needed for making the inferior call functions.  */

/* Push an empty stack frame, to record the current PC, etc.  */

#define PUSH_DUMMY_FRAME \
{ register CORE_ADDR sp = read_register (SP_REGNUM);			\
  register int regnum;							\
  char raw_buffer[12];							\
  sp = push_word (sp, read_register (PC_REGNUM));			\
  sp = push_word (sp, read_register (FP_REGNUM));			\
  write_register (FP_REGNUM, sp);					\
  for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)		\
    { read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);	\
      sp = push_bytes (sp, raw_buffer, 12); }				\
  for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)			\
    sp = push_word (sp, read_register (regnum));			\
  sp = push_word (sp, read_register (PS_REGNUM));			\
  write_register (SP_REGNUM, sp);  }

/* Discard from the stack the innermost frame, 
   restoring all saved registers.  */

#define POP_FRAME  \
{ register FRAME frame = get_current_frame ();				\
  register CORE_ADDR fp;						\
  register int regnum;							\
  struct frame_saved_regs fsr;						\
  struct frame_info *fi;						\
  char raw_buffer[12];							\
  fi = get_frame_info (frame);						\
  fp = fi->frame;							\
  get_frame_saved_regs (fi, &fsr);					\
  for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)		\
    if (fsr.regs[regnum])						\
      { read_memory (fsr.regs[regnum], raw_buffer, 12);			\
        write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); }\
  for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)			\
    if (fsr.regs[regnum])						\
      write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
  if (fsr.regs[PS_REGNUM])						\
    write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \
  write_register (FP_REGNUM, read_memory_integer (fp, 4));		\
  write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));  	\
  write_register (SP_REGNUM, fp + 8);					\
  flush_cached_frames ();						\
  set_current_frame (create_new_frame (read_register (FP_REGNUM),	\
					read_pc ())); }

/* This sequence of words is the instructions
     fmovem 0xff,-(sp)
     moveml 0xfffc,-(sp)
     clrw -(sp)
     movew ccr,-(sp)
     /..* The arguments are pushed at this point by GDB;
	no code is needed in the dummy for this.
	The CALL_DUMMY_START_OFFSET gives the position of 
	the following jsr instruction.  *../
     jsr @#32323232
     addl #69696969,sp
     bpt
     nop
Note this is 28 bytes.
We actually start executing at the jsr, since the pushing of the
registers is done by PUSH_DUMMY_FRAME.  If this were real code,
the arguments for the function called by the jsr would be pushed
between the moveml and the jsr, and we could allow it to execute through.
But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done,
and we cannot allow the moveml to push the registers again lest they be
taken for the arguments.  */

#define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4e4e71}

#define CALL_DUMMY_LENGTH 28

#define CALL_DUMMY_START_OFFSET 12

/* Insert the specified number of args and function address
   into a call sequence of the above form stored at DUMMYNAME.  */

#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
{ *(int *)((char *) dummyname + 20) = nargs * 4;  \
  *(int *)((char *) dummyname + 14) = fun; }
\f
#include "tm-68k.h"
Commit	Line	Data
dd3b648e RP	1	/* Definitions to make GDB run on an Altos 3068 (m68k running SVR2)
	2	Copyright (C) 1987,1989 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
99a7de40	6	This program is free software; you can redistribute it and/or modify
dd3b648e	7	it under the terms of the GNU General Public License as published by
99a7de40 JG	8	the Free Software Foundation; either version 2 of the License, or
99a7de40 JG	9	(at your option) any later version.
dd3b648e	10
99a7de40	11	This program is distributed in the hope that it will be useful,
dd3b648e RP	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
99a7de40 JG	17	along with this program; if not, write to the Free Software
99a7de40 JG	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
dd3b648e RP	19
	20	/* Sequence of bytes for breakpoint instruction. */
	21
	22	#define BREAKPOINT {0x4e, 0x4e}
	23
	24	/* Define this if the C compiler puts an underscore at the front
	25	of external names before giving them to the linker. */
	26
	27	#undef NAMES_HAVE_UNDERSCORE
	28
	29	/* Exec files and symbol tables are in COFF format */
	30
	31	#define COFF_FORMAT
	32	#define COFF_NO_LONG_FILE_NAMES
	33
	34	/* Address of end of stack space. */
	35
	36	/#define STACK_END_ADDR (0xffffff)/
	37	#define STACK_END_ADDR (0x1000000)
	38
	39	/* Amount PC must be decremented by after a breakpoint.
	40	This is often the number of bytes in BREAKPOINT
	41	but not always.
	42	On the Altos, the kernel resets the pc to the trap instr */
	43
	44	#define DECR_PC_AFTER_BREAK 0
	45
	46	\f
	47	/* Things needed for making the inferior call functions. */
	48
	49	/* Push an empty stack frame, to record the current PC, etc. */
	50
	51	#define PUSH_DUMMY_FRAME \
	52	{ register CORE_ADDR sp = read_register (SP_REGNUM); \
	53	register int regnum; \
	54	char raw_buffer[12]; \
	55	sp = push_word (sp, read_register (PC_REGNUM)); \
	56	sp = push_word (sp, read_register (FP_REGNUM)); \
	57	write_register (FP_REGNUM, sp); \
	58	for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) \
	59	{ read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); \
	60	sp = push_bytes (sp, raw_buffer, 12); } \
	61	for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \
	62	sp = push_word (sp, read_register (regnum)); \
	63	sp = push_word (sp, read_register (PS_REGNUM)); \
	64	write_register (SP_REGNUM, sp); }
	65
	66	/* Discard from the stack the innermost frame,
	67	restoring all saved registers. */
	68
	69	#define POP_FRAME \
	70	{ register FRAME frame = get_current_frame (); \
	71	register CORE_ADDR fp; \
	72	register int regnum; \
	73	struct frame_saved_regs fsr; \
	74	struct frame_info *fi; \
	75	char raw_buffer[12]; \
	76	fi = get_frame_info (frame); \
	77	fp = fi->frame; \
	78	get_frame_saved_regs (fi, &fsr); \
	79	for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) \
	80	if (fsr.regs[regnum]) \
	81	{ read_memory (fsr.regs[regnum], raw_buffer, 12); \
	82	write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); }\
83	for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \
84	if (fsr.regs[regnum]) \
85	write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
86	if (fsr.regs[PS_REGNUM]) \
87	write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \
88	write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
89	write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
90	write_register (SP_REGNUM, fp + 8); \
91	flush_cached_frames (); \
92	set_current_frame (create_new_frame (read_register (FP_REGNUM), \
93	read_pc ())); }
94
95	/* This sequence of words is the instructions
96	fmovem 0xff,-(sp)
97	moveml 0xfffc,-(sp)
98	clrw -(sp)
99	movew ccr,-(sp)
100	/..* The arguments are pushed at this point by GDB;
101	no code is needed in the dummy for this.
102	The CALL_DUMMY_START_OFFSET gives the position of
103	the following jsr instruction. *../
104	jsr @#32323232
105	addl #69696969,sp
106	bpt
107	nop
108	Note this is 28 bytes.
109	We actually start executing at the jsr, since the pushing of the
110	registers is done by PUSH_DUMMY_FRAME. If this were real code,
111	the arguments for the function called by the jsr would be pushed
112	between the moveml and the jsr, and we could allow it to execute through.
113	But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done,
114	and we cannot allow the moveml to push the registers again lest they be
115	taken for the arguments. */
116
117	#define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4e4e71}
118
119	#define CALL_DUMMY_LENGTH 28
120
121	#define CALL_DUMMY_START_OFFSET 12
122
123	/* Insert the specified number of args and function address
124	into a call sequence of the above form stored at DUMMYNAME. */
125
126	#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
127	{ (int )((char ) dummyname + 20) = nargs 4; \
128	(int )((char *) dummyname + 14) = fun; }
129	\f
130	#include "tm-68k.h"