| 1 |
106 |
markom |
/* Definitions to target GDB on an ISI Optimum V (3.05) under 4.3bsd.
|
| 2 |
|
|
Copyright (C) 1987, 1989, 1991, 1993 Free Software Foundation, Inc.
|
| 3 |
|
|
|
| 4 |
|
|
This file is part of GDB.
|
| 5 |
|
|
|
| 6 |
|
|
This program is free software; you can redistribute it and/or modify
|
| 7 |
|
|
it under the terms of the GNU General Public License as published by
|
| 8 |
|
|
the Free Software Foundation; either version 2 of the License, or
|
| 9 |
|
|
(at your option) any later version.
|
| 10 |
|
|
|
| 11 |
|
|
This program is distributed in the hope that it will be useful,
|
| 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
|
| 17 |
|
|
along with this program; if not, write to the Free Software
|
| 18 |
|
|
Foundation, Inc., 59 Temple Place - Suite 330,
|
| 19 |
|
|
Boston, MA 02111-1307, USA. */
|
| 20 |
|
|
|
| 21 |
|
|
/* This has not been tested on ISI's running BSD 4.2, but it will probably
|
| 22 |
|
|
work. */
|
| 23 |
|
|
|
| 24 |
|
|
/* Data segment starts at etext rounded up to DATAROUND in {N,Z}MAGIC files */
|
| 25 |
|
|
|
| 26 |
|
|
#define DATAROUND 0x20000
|
| 27 |
|
|
#define N_DATADDR(hdr) (hdr.a_magic != OMAGIC ? \
|
| 28 |
|
|
(hdr.a_text + DATAROUND) & ~(DATAROUND-1) : hdr.a_text)
|
| 29 |
|
|
|
| 30 |
|
|
/* Text segment starts at sizeof (struct exec) in {N,Z}MAGIC files */
|
| 31 |
|
|
|
| 32 |
|
|
#define N_TXTADDR(hdr) (hdr.a_magic != OMAGIC ? sizeof (struct exec) : 0)
|
| 33 |
|
|
|
| 34 |
|
|
/* Amount PC must be decremented by after a breakpoint.
|
| 35 |
|
|
This is often the number of bytes in BREAKPOINT
|
| 36 |
|
|
but not always.
|
| 37 |
|
|
On the ISI, the kernel resets the pc to the trap instr */
|
| 38 |
|
|
|
| 39 |
|
|
#define DECR_PC_AFTER_BREAK 0
|
| 40 |
|
|
|
| 41 |
|
|
|
| 42 |
|
|
/* Return number of args passed to a frame.
|
| 43 |
|
|
Can return -1, meaning no way to tell. */
|
| 44 |
|
|
|
| 45 |
|
|
extern int isi_frame_num_args PARAMS ((struct frame_info * fi));
|
| 46 |
|
|
#define FRAME_NUM_ARGS(fi) (isi_frame_num_args ((fi)))
|
| 47 |
|
|
|
| 48 |
|
|
/* Put here the code to store, into a struct frame_saved_regs,
|
| 49 |
|
|
the addresses of the saved registers of frame described by FRAME_INFO.
|
| 50 |
|
|
This includes special registers such as pc and fp saved in special
|
| 51 |
|
|
ways in the stack frame. sp is even more special:
|
| 52 |
|
|
the address we return for it IS the sp for the next frame. */
|
| 53 |
|
|
|
| 54 |
|
|
#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
|
| 55 |
|
|
{ register int regnum; \
|
| 56 |
|
|
register int regmask; \
|
| 57 |
|
|
register CORE_ADDR next_addr; \
|
| 58 |
|
|
register CORE_ADDR pc; \
|
| 59 |
|
|
register int insn; \
|
| 60 |
|
|
register int offset; \
|
| 61 |
|
|
memset (&frame_saved_regs, '\0', sizeof frame_saved_regs); \
|
| 62 |
|
|
if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \
|
| 63 |
|
|
&& (frame_info)->pc <= (frame_info)->frame) \
|
| 64 |
|
|
{ next_addr = (frame_info)->frame; \
|
| 65 |
|
|
pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\
|
| 66 |
|
|
else \
|
| 67 |
|
|
{ pc = get_pc_function_start ((frame_info)->pc); \
|
| 68 |
|
|
/* Verify we have a link a6 instruction next, \
|
| 69 |
|
|
or a branch followed by a link a6 instruction; \
|
| 70 |
|
|
if not we lose. If we win, find the address above the saved \
|
| 71 |
|
|
regs using the amount of storage from the link instruction. */\
|
| 72 |
|
|
retry: \
|
| 73 |
|
|
insn = read_memory_integer (pc, 2); \
|
| 74 |
|
|
if (insn == 044016) \
|
| 75 |
|
|
next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 4), pc+=4; \
|
| 76 |
|
|
else if (insn == 047126) \
|
| 77 |
|
|
next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 2), pc+=2; \
|
| 78 |
|
|
else if ((insn & 0177400) == 060000) /* bra insn */ \
|
| 79 |
|
|
{ offset = insn & 0377; \
|
| 80 |
|
|
pc += 2; /* advance past bra */ \
|
| 81 |
|
|
if (offset == 0) /* bra #word */ \
|
| 82 |
|
|
offset = read_memory_integer (pc, 2), pc += 2; \
|
| 83 |
|
|
else if (offset == 0377) /* bra #long */ \
|
| 84 |
|
|
offset = read_memory_integer (pc, 4), pc += 4; \
|
| 85 |
|
|
pc += offset; \
|
| 86 |
|
|
goto retry; \
|
| 87 |
|
|
} else goto lose; \
|
| 88 |
|
|
/* If have an addal #-n, sp next, adjust next_addr. */ \
|
| 89 |
|
|
if ((0177777 & read_memory_integer (pc, 2)) == 0157774) \
|
| 90 |
|
|
next_addr += read_memory_integer (pc += 2, 4), pc += 4; \
|
| 91 |
|
|
} \
|
| 92 |
|
|
/* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */ \
|
| 93 |
|
|
insn = read_memory_integer (pc, 2), pc += 2; \
|
| 94 |
|
|
regmask = read_memory_integer (pc, 2); \
|
| 95 |
|
|
if ((insn & 0177760) == 022700) /* movl rn, (sp) */ \
|
| 96 |
|
|
(frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr; \
|
| 97 |
|
|
else if ((insn & 0177760) == 024700) /* movl rn, -(sp) */ \
|
| 98 |
|
|
(frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr-=4; \
|
| 99 |
|
|
else if (insn == 0044327) /* moveml mask, (sp) */ \
|
| 100 |
|
|
{ pc += 2; \
|
| 101 |
|
|
/* Regmask's low bit is for register 0, the first written */ \
|
| 102 |
|
|
next_addr -= 4; \
|
| 103 |
|
|
for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \
|
| 104 |
|
|
if (regmask & 1) \
|
| 105 |
|
|
(frame_saved_regs).regs[regnum] = (next_addr += 4); \
|
| 106 |
|
|
} else if (insn == 0044347) /* moveml mask, -(sp) */ \
|
| 107 |
|
|
{ pc += 2; \
|
| 108 |
|
|
/* Regmask's low bit is for register 15, the first pushed */ \
|
| 109 |
|
|
for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \
|
| 110 |
|
|
if (regmask & 1) \
|
| 111 |
|
|
(frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
|
| 112 |
|
|
/* clrw -(sp); movw ccr,-(sp) may follow. */ \
|
| 113 |
|
|
if (read_memory_integer (pc, 2) == 041147 \
|
| 114 |
|
|
&& read_memory_integer (pc+2, 2) == 042347) \
|
| 115 |
|
|
(frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4); \
|
| 116 |
|
|
lose: ; \
|
| 117 |
|
|
(frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8; \
|
| 118 |
|
|
(frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \
|
| 119 |
|
|
(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \
|
| 120 |
|
|
}
|
| 121 |
|
|
|
| 122 |
|
|
/* The only reason this is here is the tm-isi.h reference below. It
|
| 123 |
|
|
was moved back here from tm-m68k.h. FIXME? */
|
| 124 |
|
|
|
| 125 |
|
|
extern CORE_ADDR isi_skip_prologue PARAMS ((CORE_ADDR));
|
| 126 |
|
|
#define SKIP_PROLOGUE(pc) (isi_skip_prologue (pc))
|
| 127 |
|
|
|
| 128 |
|
|
#include "m68k/tm-m68k.h"
|
