1 /* 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.
4 This file is part of GDB.
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.
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.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* This has not been tested on ISI's running BSD 4.2, but it will probably
23 /* Data segment starts at etext rounded up to DATAROUND in {N,Z}MAGIC files */
25 #define DATAROUND 0x20000
26 #define N_DATADDR(hdr) (hdr.a_magic != OMAGIC ? \
27 (hdr.a_text + DATAROUND) & ~(DATAROUND-1) : hdr.a_text)
29 /* Text segment starts at sizeof (struct exec) in {N,Z}MAGIC files */
31 #define N_TXTADDR(hdr) (hdr.a_magic != OMAGIC ? sizeof (struct exec) : 0)
33 /* Amount PC must be decremented by after a breakpoint.
34 This is often the number of bytes in BREAKPOINT
36 On the ISI, the kernel resets the pc to the trap instr */
38 #define DECR_PC_AFTER_BREAK 0
41 /* Return number of args passed to a frame.
42 Can return -1, meaning no way to tell. */
44 #define FRAME_NUM_ARGS(val, fi) \
45 { register CORE_ADDR pc = FRAME_SAVED_PC (fi); \
46 register int insn = 0177777 & read_memory_integer (pc, 2); \
48 if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ \
49 val = read_memory_integer (pc + 2, 2); \
50 else if ((insn & 0170777) == 0050217 /* addql #N, sp */ \
51 || (insn & 0170777) == 0050117) /* addqw */ \
52 { val = (insn >> 9) & 7; if (val == 0) val = 8; } \
53 else if (insn == 0157774) /* addal #WW, sp */ \
54 val = read_memory_integer (pc + 2, 4); \
57 /* Put here the code to store, into a struct frame_saved_regs,
58 the addresses of the saved registers of frame described by FRAME_INFO.
59 This includes special registers such as pc and fp saved in special
60 ways in the stack frame. sp is even more special:
61 the address we return for it IS the sp for the next frame. */
63 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
64 { register int regnum; \
65 register int regmask; \
66 register CORE_ADDR next_addr; \
67 register CORE_ADDR pc; \
69 register int offset; \
70 memset (&frame_saved_regs, '\0', sizeof frame_saved_regs); \
71 if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \
72 && (frame_info)->pc <= (frame_info)->frame) \
73 { next_addr = (frame_info)->frame; \
74 pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\
76 { pc = get_pc_function_start ((frame_info)->pc); \
77 /* Verify we have a link a6 instruction next, \
78 or a branch followed by a link a6 instruction; \
79 if not we lose. If we win, find the address above the saved \
80 regs using the amount of storage from the link instruction. */\
82 insn = read_memory_integer (pc, 2); \
84 next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 4), pc+=4; \
85 else if (insn == 047126) \
86 next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 2), pc+=2; \
87 else if ((insn & 0177400) == 060000) /* bra insn */ \
88 { offset = insn & 0377; \
89 pc += 2; /* advance past bra */ \
90 if (offset == 0) /* bra #word */ \
91 offset = read_memory_integer (pc, 2), pc += 2; \
92 else if (offset == 0377) /* bra #long */ \
93 offset = read_memory_integer (pc, 4), pc += 4; \
97 /* If have an addal #-n, sp next, adjust next_addr. */ \
98 if ((0177777 & read_memory_integer (pc, 2)) == 0157774) \
99 next_addr += read_memory_integer (pc += 2, 4), pc += 4; \
101 /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */ \
102 insn = read_memory_integer (pc, 2), pc += 2; \
103 regmask = read_memory_integer (pc, 2); \
104 if ((insn & 0177760) == 022700) /* movl rn, (sp) */ \
105 (frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr; \
106 else if ((insn & 0177760) == 024700) /* movl rn, -(sp) */ \
107 (frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr-=4; \
108 else if (insn == 0044327) /* moveml mask, (sp) */ \
110 /* Regmask's low bit is for register 0, the first written */ \
112 for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \
114 (frame_saved_regs).regs[regnum] = (next_addr += 4); \
115 } else if (insn == 0044347) /* moveml mask, -(sp) */ \
117 /* Regmask's low bit is for register 15, the first pushed */ \
118 for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \
120 (frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
121 /* clrw -(sp); movw ccr,-(sp) may follow. */ \
122 if (read_memory_integer (pc, 2) == 041147 \
123 && read_memory_integer (pc+2, 2) == 042347) \
124 (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4); \
126 (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8; \
127 (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \
128 (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \
131 /* The only reason this is here is the tm-isi.h reference below. It
132 was moved back here from tm-m68k.h. FIXME? */
134 #define SKIP_PROLOGUE(pc) \
135 { register int op = read_memory_integer (pc, 2); \
137 pc += 4; /* Skip link #word */ \
138 else if (op == 0044016) \
139 pc += 6; /* Skip link #long */ \
140 /* Not sure why branches are here. */ \
141 /* From tm-isi.h, tm-altos.h */ \
142 else if (op == 0060000) \
143 pc += 4; /* Skip bra #word */ \
144 else if (op == 00600377) \
145 pc += 6; /* skip bra #long */ \
146 else if ((op & 0177400) == 0060000) \
147 pc += 2; /* skip bra #char */ \
150 #include "m68k/tm-m68k.h"
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