131 lines
4.8 KiB
C
131 lines
4.8 KiB
C
|
/* 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.
|
|||
|
|
|
|||
|
|
GDB 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 1, or (at your option)
|
|||
|
|
any later version.
|
|||
|
|
|
|||
|
|
GDB 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 GDB; see the file COPYING. If not, write to
|
|||
|
|
the Free Software Foundation, 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
|
|||
|
|
|
|||
|
|
|
|||
|
|
/* 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; }
|
|||
|
|
|
|||
|
|
#include "tm-68k.h"
|