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5076de82 FF |
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. | |
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., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | /* This has not been tested on ISI's running BSD 4.2, but it will probably | |
21 | work. */ | |
22 | ||
5076de82 FF |
23 | /* Data segment starts at etext rounded up to DATAROUND in {N,Z}MAGIC files */ |
24 | ||
25 | #define DATAROUND 0x20000 | |
26 | #define N_DATADDR(hdr) (hdr.a_magic != OMAGIC ? \ | |
27 | (hdr.a_text + DATAROUND) & ~(DATAROUND-1) : hdr.a_text) | |
28 | ||
29 | /* Text segment starts at sizeof (struct exec) in {N,Z}MAGIC files */ | |
30 | ||
31 | #define N_TXTADDR(hdr) (hdr.a_magic != OMAGIC ? sizeof (struct exec) : 0) | |
32 | ||
33 | /* Amount PC must be decremented by after a breakpoint. | |
34 | This is often the number of bytes in BREAKPOINT | |
35 | but not always. | |
36 | On the ISI, the kernel resets the pc to the trap instr */ | |
37 | ||
38 | #define DECR_PC_AFTER_BREAK 0 | |
39 | ||
40 | \f | |
41 | /* Return number of args passed to a frame. | |
42 | Can return -1, meaning no way to tell. */ | |
43 | ||
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); \ | |
47 | val = 0; \ | |
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); \ | |
55 | val >>= 2; } | |
56 | ||
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. */ | |
62 | ||
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; \ | |
68 | register int insn; \ | |
69 | register int offset; \ | |
4ed97c9a | 70 | memset (&frame_saved_regs, '\0', sizeof frame_saved_regs); \ |
5076de82 FF |
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; }\ | |
75 | else \ | |
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. */\ | |
81 | retry: \ | |
82 | insn = read_memory_integer (pc, 2); \ | |
83 | if (insn == 044016) \ | |
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; \ | |
94 | pc += offset; \ | |
95 | goto retry; \ | |
96 | } else goto lose; \ | |
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; \ | |
100 | } \ | |
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) */ \ | |
109 | { pc += 2; \ | |
110 | /* Regmask's low bit is for register 0, the first written */ \ | |
111 | next_addr -= 4; \ | |
112 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \ | |
113 | if (regmask & 1) \ | |
114 | (frame_saved_regs).regs[regnum] = (next_addr += 4); \ | |
115 | } else if (insn == 0044347) /* moveml mask, -(sp) */ \ | |
116 | { pc += 2; \ | |
117 | /* Regmask's low bit is for register 15, the first pushed */ \ | |
118 | for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \ | |
119 | if (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); \ | |
125 | lose: ; \ | |
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; \ | |
129 | } | |
130 | ||
131 | /* The only reason this is here is the tm-isi.h reference below. It | |
2225eb85 | 132 | was moved back here from tm-m68k.h. FIXME? */ |
5076de82 FF |
133 | |
134 | #define SKIP_PROLOGUE(pc) \ | |
135 | { register int op = read_memory_integer (pc, 2); \ | |
136 | if (op == 0047126) \ | |
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 */ \ | |
148 | } | |
149 | ||
2225eb85 | 150 | #include "m68k/tm-m68k.h" |