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/* Definitions to target GDB on an ISI Optimum V (3.05) under 4.3bsd.
Copyright (C) 1987, 1989, 1991, 1993 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* This has not been tested on ISI's running BSD 4.2, but it will probably
work. */
/* Data segment starts at etext rounded up to DATAROUND in {N,Z}MAGIC files */
#define DATAROUND 0x20000
#define N_DATADDR(hdr) (hdr.a_magic != OMAGIC ? \
(hdr.a_text + DATAROUND) & ~(DATAROUND-1) : hdr.a_text)
/* Text segment starts at sizeof (struct exec) in {N,Z}MAGIC files */
#define N_TXTADDR(hdr) (hdr.a_magic != OMAGIC ? sizeof (struct exec) : 0)
/* Amount PC must be decremented by after a breakpoint.
This is often the number of bytes in BREAKPOINT
but not always.
On the ISI, the kernel resets the pc to the trap instr */
#define DECR_PC_AFTER_BREAK 0
/* Return number of args passed to a frame.
Can return -1, meaning no way to tell. */
#define FRAME_NUM_ARGS(val, fi) \
{ register CORE_ADDR pc = FRAME_SAVED_PC (fi); \
register int insn = 0177777 & read_memory_integer (pc, 2); \
val = 0; \
if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ \
val = read_memory_integer (pc + 2, 2); \
else if ((insn & 0170777) == 0050217 /* addql #N, sp */ \
|| (insn & 0170777) == 0050117) /* addqw */ \
{ val = (insn >> 9) & 7; if (val == 0) val = 8; } \
else if (insn == 0157774) /* addal #WW, sp */ \
val = read_memory_integer (pc + 2, 4); \
val >>= 2; }
/* Put here the code to store, into a struct frame_saved_regs,
the addresses of the saved registers of frame described by FRAME_INFO.
This includes special registers such as pc and fp saved in special
ways in the stack frame. sp is even more special:
the address we return for it IS the sp for the next frame. */
#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
{ register int regnum; \
register int regmask; \
register CORE_ADDR next_addr; \
register CORE_ADDR pc; \
register int insn; \
register int offset; \
memset (&frame_saved_regs, '\0', sizeof frame_saved_regs); \
if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \
&& (frame_info)->pc <= (frame_info)->frame) \
{ next_addr = (frame_info)->frame; \
pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\
else \
{ pc = get_pc_function_start ((frame_info)->pc); \
/* Verify we have a link a6 instruction next, \
or a branch followed by a link a6 instruction; \
if not we lose. If we win, find the address above the saved \
regs using the amount of storage from the link instruction. */\
retry: \
insn = read_memory_integer (pc, 2); \
if (insn == 044016) \
next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 4), pc+=4; \
else if (insn == 047126) \
next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 2), pc+=2; \
else if ((insn & 0177400) == 060000) /* bra insn */ \
{ offset = insn & 0377; \
pc += 2; /* advance past bra */ \
if (offset == 0) /* bra #word */ \
offset = read_memory_integer (pc, 2), pc += 2; \
else if (offset == 0377) /* bra #long */ \
offset = read_memory_integer (pc, 4), pc += 4; \
pc += offset; \
goto retry; \
} else goto lose; \
/* If have an addal #-n, sp next, adjust next_addr. */ \
if ((0177777 & read_memory_integer (pc, 2)) == 0157774) \
next_addr += read_memory_integer (pc += 2, 4), pc += 4; \
} \
/* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */ \
insn = read_memory_integer (pc, 2), pc += 2; \
regmask = read_memory_integer (pc, 2); \
if ((insn & 0177760) == 022700) /* movl rn, (sp) */ \
(frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr; \
else if ((insn & 0177760) == 024700) /* movl rn, -(sp) */ \
(frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr-=4; \
else if (insn == 0044327) /* moveml mask, (sp) */ \
{ pc += 2; \
/* Regmask's low bit is for register 0, the first written */ \
next_addr -= 4; \
for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \
if (regmask & 1) \
(frame_saved_regs).regs[regnum] = (next_addr += 4); \
} else if (insn == 0044347) /* moveml mask, -(sp) */ \
{ pc += 2; \
/* Regmask's low bit is for register 15, the first pushed */ \
for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \
if (regmask & 1) \
(frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
/* clrw -(sp); movw ccr,-(sp) may follow. */ \
if (read_memory_integer (pc, 2) == 041147 \
&& read_memory_integer (pc+2, 2) == 042347) \
(frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4); \
lose: ; \
(frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8; \
(frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \
(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \
}
/* The only reason this is here is the tm-isi.h reference below. It
was moved back here from tm-m68k.h. FIXME? */
#define SKIP_PROLOGUE(pc) \
{ register int op = read_memory_integer (pc, 2); \
if (op == 0047126) \
pc += 4; /* Skip link #word */ \
else if (op == 0044016) \
pc += 6; /* Skip link #long */ \
/* Not sure why branches are here. */ \
/* From tm-isi.h, tm-altos.h */ \
else if (op == 0060000) \
pc += 4; /* Skip bra #word */ \
else if (op == 00600377) \
pc += 6; /* skip bra #long */ \
else if ((op & 0177400) == 0060000) \
pc += 2; /* skip bra #char */ \
}
#include "m68k/tm-m68k.h"
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