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dd3b648e RP |
1 | /* Definitions to target GDB on an ISI Optimum V (3.05) under 4.3bsd. |
2 | Copyright (C) 1987, 1989 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
99a7de40 | 6 | This program is free software; you can redistribute it and/or modify |
dd3b648e | 7 | it under the terms of the GNU General Public License as published by |
99a7de40 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
dd3b648e | 10 | |
99a7de40 | 11 | This program is distributed in the hope that it will be useful, |
dd3b648e RP |
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 | |
99a7de40 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
dd3b648e RP |
19 | |
20 | /* This has not been tested on ISI's running BSD 4.2, but it will probably | |
21 | work. */ | |
22 | ||
84d82b1c FF |
23 | #define HAVE_68881 |
24 | ||
dd3b648e RP |
25 | /* Define this if the C compiler puts an underscore at the front |
26 | of external names before giving them to the linker. */ | |
27 | ||
28 | #define NAMES_HAVE_UNDERSCORE | |
29 | ||
30 | /* Debugger information will be in DBX format. */ | |
31 | ||
32 | #define READ_DBX_FORMAT | |
33 | ||
84d82b1c FF |
34 | /* Address of end of stack space. */ |
35 | ||
dd3b648e RP |
36 | #define STACK_END_ADDR 0xfffe000 |
37 | ||
38 | /* Data segment starts at etext rounded up to DATAROUND in {N,Z}MAGIC files */ | |
39 | ||
40 | #define DATAROUND 0x20000 | |
41 | #define N_DATADDR(hdr) (hdr.a_magic != OMAGIC ? \ | |
42 | (hdr.a_text + DATAROUND) & ~(DATAROUND-1) : hdr.a_text) | |
43 | ||
44 | /* Text segment starts at sizeof (struct exec) in {N,Z}MAGIC files */ | |
45 | ||
46 | #define N_TXTADDR(hdr) (hdr.a_magic != OMAGIC ? sizeof (struct exec) : 0) | |
47 | ||
48 | /* Amount PC must be decremented by after a breakpoint. | |
49 | This is often the number of bytes in BREAKPOINT | |
50 | but not always. | |
51 | On the ISI, the kernel resets the pc to the trap instr */ | |
52 | ||
53 | #define DECR_PC_AFTER_BREAK 0 | |
54 | ||
55 | \f | |
56 | /* Return number of args passed to a frame. | |
57 | Can return -1, meaning no way to tell. */ | |
58 | ||
59 | #define FRAME_NUM_ARGS(val, fi) \ | |
60 | { register CORE_ADDR pc = FRAME_SAVED_PC (fi); \ | |
61 | register int insn = 0177777 & read_memory_integer (pc, 2); \ | |
62 | val = 0; \ | |
63 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ \ | |
64 | val = read_memory_integer (pc + 2, 2); \ | |
65 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ \ | |
66 | || (insn & 0170777) == 0050117) /* addqw */ \ | |
67 | { val = (insn >> 9) & 7; if (val == 0) val = 8; } \ | |
68 | else if (insn == 0157774) /* addal #WW, sp */ \ | |
69 | val = read_memory_integer (pc + 2, 4); \ | |
70 | val >>= 2; } | |
71 | ||
72 | /* Put here the code to store, into a struct frame_saved_regs, | |
73 | the addresses of the saved registers of frame described by FRAME_INFO. | |
74 | This includes special registers such as pc and fp saved in special | |
75 | ways in the stack frame. sp is even more special: | |
76 | the address we return for it IS the sp for the next frame. */ | |
77 | ||
78 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ | |
79 | { register int regnum; \ | |
80 | register int regmask; \ | |
81 | register CORE_ADDR next_addr; \ | |
82 | register CORE_ADDR pc; \ | |
83 | register int insn; \ | |
84 | register int offset; \ | |
85 | bzero (&frame_saved_regs, sizeof frame_saved_regs); \ | |
86 | if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \ | |
87 | && (frame_info)->pc <= (frame_info)->frame) \ | |
88 | { next_addr = (frame_info)->frame; \ | |
89 | pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\ | |
90 | else \ | |
91 | { pc = get_pc_function_start ((frame_info)->pc); \ | |
92 | /* Verify we have a link a6 instruction next, \ | |
93 | or a branch followed by a link a6 instruction; \ | |
94 | if not we lose. If we win, find the address above the saved \ | |
95 | regs using the amount of storage from the link instruction. */\ | |
96 | retry: \ | |
97 | insn = read_memory_integer (pc, 2); \ | |
98 | if (insn == 044016) \ | |
99 | next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 4), pc+=4; \ | |
100 | else if (insn == 047126) \ | |
101 | next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 2), pc+=2; \ | |
102 | else if ((insn & 0177400) == 060000) /* bra insn */ \ | |
103 | { offset = insn & 0377; \ | |
104 | pc += 2; /* advance past bra */ \ | |
105 | if (offset == 0) /* bra #word */ \ | |
106 | offset = read_memory_integer (pc, 2), pc += 2; \ | |
107 | else if (offset == 0377) /* bra #long */ \ | |
108 | offset = read_memory_integer (pc, 4), pc += 4; \ | |
109 | pc += offset; \ | |
110 | goto retry; \ | |
111 | } else goto lose; \ | |
112 | /* If have an addal #-n, sp next, adjust next_addr. */ \ | |
113 | if ((0177777 & read_memory_integer (pc, 2)) == 0157774) \ | |
114 | next_addr += read_memory_integer (pc += 2, 4), pc += 4; \ | |
115 | } \ | |
116 | /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */ \ | |
117 | insn = read_memory_integer (pc, 2), pc += 2; \ | |
118 | regmask = read_memory_integer (pc, 2); \ | |
119 | if ((insn & 0177760) == 022700) /* movl rn, (sp) */ \ | |
120 | (frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr; \ | |
121 | else if ((insn & 0177760) == 024700) /* movl rn, -(sp) */ \ | |
122 | (frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr-=4; \ | |
123 | else if (insn == 0044327) /* moveml mask, (sp) */ \ | |
124 | { pc += 2; \ | |
125 | /* Regmask's low bit is for register 0, the first written */ \ | |
126 | next_addr -= 4; \ | |
127 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \ | |
128 | if (regmask & 1) \ | |
129 | (frame_saved_regs).regs[regnum] = (next_addr += 4); \ | |
130 | } else if (insn == 0044347) /* moveml mask, -(sp) */ \ | |
131 | { pc += 2; \ | |
132 | /* Regmask's low bit is for register 15, the first pushed */ \ | |
133 | for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \ | |
134 | if (regmask & 1) \ | |
135 | (frame_saved_regs).regs[regnum] = (next_addr -= 4); } \ | |
136 | /* clrw -(sp); movw ccr,-(sp) may follow. */ \ | |
137 | if (read_memory_integer (pc, 2) == 041147 \ | |
138 | && read_memory_integer (pc+2, 2) == 042347) \ | |
139 | (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4); \ | |
140 | lose: ; \ | |
141 | (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8; \ | |
142 | (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \ | |
143 | (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \ | |
144 | } | |
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145 | |
146 | #include "tm-68k.h" |