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c906108c SS |
1 | /* Definitions to make GDB target for a tahoe running 4.3-Reno. |
2 | Copyright 1986, 1987, 1989, 1991, 1992, 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, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | /* | |
21 | * Ported by the State University of New York at Buffalo by the Distributed | |
22 | * Computer Systems Lab, Department of Computer Science, 1991. | |
23 | */ | |
24 | ||
25 | #define TARGET_BYTE_ORDER BIG_ENDIAN | |
26 | #define BITS_BIG_ENDIAN 0 | |
27 | ||
28 | /* Offset from address of function to start of its code. | |
29 | Zero on most machines. */ | |
30 | ||
31 | #define FUNCTION_START_OFFSET 2 | |
32 | ||
33 | /* Advance PC across any function entry prologue instructions | |
34 | to reach some "real" code. */ | |
35 | ||
b83266a0 SS |
36 | extern CORE_ADDR tahoe_skip_prologue PARAMS ((CORE_ADDR)); |
37 | #define SKIP_PROLOGUE(pc) (tahoe_skip_prologue (pc)) | |
c906108c SS |
38 | |
39 | /* Immediately after a function call, return the saved pc. | |
40 | Can't always go through the frames for this because on some machines | |
41 | the new frame is not set up until the new function executes | |
42 | some instructions. */ | |
43 | ||
44 | #define SAVED_PC_AFTER_CALL(frame) FRAME_SAVED_PC(frame) | |
45 | ||
46 | /* Wrong for cross-debugging. I don't know the real values. */ | |
47 | #include <machine/param.h> | |
48 | #define TARGET_UPAGES UPAGES | |
49 | #define TARGET_NBPG NBPG | |
50 | ||
51 | /* Address of end of stack space. */ | |
52 | ||
53 | #define STACK_END_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG)) | |
54 | ||
55 | /* On BSD, sigtramp is in the u area. Can't check the exact | |
56 | addresses because for cross-debugging we don't have target include | |
57 | files around. This should be close enough. */ | |
58 | #define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0xc0000000)) | |
59 | ||
60 | /* Stack grows downward. */ | |
61 | ||
62 | #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) | |
63 | ||
64 | /* Sequence of bytes for breakpoint instruction. */ | |
65 | ||
66 | #define BREAKPOINT {0x30} | |
67 | ||
68 | /* Amount PC must be decremented by after a breakpoint. | |
69 | This is often the number of bytes in BREAKPOINT | |
70 | but not always. */ | |
71 | ||
72 | #define DECR_PC_AFTER_BREAK 0 | |
73 | ||
74 | /* Return 1 if P points to an invalid floating point value. | |
75 | LEN is the length in bytes -- not relevant on the Tahoe. */ | |
76 | ||
77 | #define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000) | |
78 | ||
79 | /* Say how long (ordinary) registers are. This is a piece of bogosity | |
80 | used in push_word and a few other places; REGISTER_RAW_SIZE is the | |
81 | real way to know how big a register is. */ | |
82 | ||
83 | #define REGISTER_SIZE 4 | |
84 | ||
85 | /* Number of machine registers */ | |
86 | ||
87 | #define NUM_REGS 19 | |
88 | ||
89 | /* Initializer for an array of names of registers. | |
90 | There should be NUM_REGS strings in this initializer. */ | |
91 | ||
92 | #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "fp", "sp", "pc", "ps", "al", "ah"} | |
93 | ||
94 | #define FP_REGNUM 13 /* Contains address of executing stack frame */ | |
95 | #define SP_REGNUM 14 /* Contains address of top of stack */ | |
96 | #define PC_REGNUM 15 /* Contains program counter */ | |
97 | #define PS_REGNUM 16 /* Contains processor status */ | |
98 | ||
99 | #define AL_REGNUM 17 /* Contains accumulator */ | |
100 | #define AH_REGNUM 18 | |
101 | ||
102 | /* Total amount of space needed to store our copies of the machine's | |
103 | register state, the array `registers'. */ | |
104 | ||
105 | #define REGISTER_BYTES (19*4) | |
106 | ||
107 | /* Index within `registers' of the first byte of the space for | |
108 | register N. */ | |
109 | ||
110 | #define REGISTER_BYTE(N) ((N) * 4) | |
111 | ||
112 | /* Number of bytes of storage in the actual machine representation | |
113 | for register N. On the tahoe, all regs are 4 bytes. */ | |
114 | ||
115 | #define REGISTER_RAW_SIZE(N) 4 | |
116 | ||
117 | /* Number of bytes of storage in the program's representation | |
118 | for register N. On the tahoe, all regs are 4 bytes. */ | |
119 | ||
120 | #define REGISTER_VIRTUAL_SIZE(N) 4 | |
121 | ||
122 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
123 | ||
124 | #define MAX_REGISTER_RAW_SIZE 4 | |
125 | ||
126 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
127 | ||
128 | #define MAX_REGISTER_VIRTUAL_SIZE 4 | |
129 | ||
130 | /* Return the GDB type object for the "standard" data type | |
131 | of data in register N. */ | |
132 | ||
133 | #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int | |
134 | ||
135 | /* Store the address of the place in which to copy the structure the | |
136 | subroutine will return. This is called from call_function. */ | |
137 | ||
138 | #define STORE_STRUCT_RETURN(ADDR, SP) \ | |
139 | { write_register (1, (ADDR)); } | |
140 | ||
141 | /* Extract from an array REGBUF containing the (raw) register state | |
142 | a function return value of type TYPE, and copy that, in virtual format, | |
143 | into VALBUF. */ | |
144 | ||
145 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
146 | memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE)) | |
147 | ||
148 | /* Write into appropriate registers a function return value | |
149 | of type TYPE, given in virtual format. */ | |
150 | ||
151 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
152 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) | |
153 | ||
154 | /* Extract from an array REGBUF containing the (raw) register state | |
155 | the address in which a function should return its structure value, | |
156 | as a CORE_ADDR (or an expression that can be used as one). */ | |
157 | ||
158 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF)) | |
159 | ||
160 | /* Describe the pointer in each stack frame to the previous stack frame | |
161 | (its caller). | |
162 | ||
163 | FRAME_CHAIN takes a frame's nominal address | |
164 | and produces the frame's chain-pointer. */ | |
165 | ||
166 | /* In the case of the Tahoe, the frame's nominal address is the FP value, | |
167 | and it points to the old FP */ | |
168 | ||
169 | #define FRAME_CHAIN(thisframe) \ | |
170 | (!inside_entry_file ((thisframe)->pc) ? \ | |
171 | read_memory_integer ((thisframe)->frame, 4) :\ | |
172 | 0) | |
173 | ||
174 | /* Define other aspects of the stack frame. */ | |
175 | ||
176 | /* Saved PC */ | |
177 | ||
178 | #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame - 8, 4)) | |
179 | ||
180 | /* In most of GDB, getting the args address is too important to | |
181 | just say "I don't know". */ | |
182 | ||
183 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) | |
184 | ||
185 | /* Address to use as an anchor for finding local variables */ | |
186 | ||
187 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
188 | ||
189 | /* Return number of args passed to a frame. | |
190 | Can return -1, meaning no way to tell. */ | |
191 | ||
192 | #define FRAME_NUM_ARGS(numargs, fi) \ | |
193 | { numargs = ((0xffff & read_memory_integer(((fi)->frame-4),4)) - 4) >> 2; } | |
194 | ||
195 | /* Return number of bytes at start of arglist that are not really args. */ | |
196 | ||
197 | #define FRAME_ARGS_SKIP 0 | |
198 | ||
199 | /* Put here the code to store, into a struct frame_saved_regs, | |
200 | the addresses of the saved registers of frame described by FRAME_INFO. | |
201 | This includes special registers such as pc and fp saved in special | |
202 | ways in the stack frame. sp is even more special: | |
203 | the address we return for it IS the sp for the next frame. */ | |
204 | ||
205 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ | |
206 | { register int regnum; \ | |
207 | register int rmask = read_memory_integer ((frame_info)->frame-4, 4) >> 16;\ | |
208 | register CORE_ADDR next_addr; \ | |
209 | memset (&frame_saved_regs, '\0', sizeof frame_saved_regs); \ | |
210 | next_addr = (frame_info)->frame - 8; \ | |
211 | for (regnum = 12; regnum >= 0; regnum--, rmask <<= 1) \ | |
212 | (frame_saved_regs).regs[regnum] = (rmask & 0x1000) ? (next_addr -= 4) : 0;\ | |
213 | (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4; \ | |
214 | (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame - 8; \ | |
215 | (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \ | |
216 | } | |
217 | ||
218 | /* Things needed for making the inferior call functions. */ | |
219 | ||
220 | /* Push an empty stack frame, to record the current PC, etc. */ | |
221 | ||
222 | #define PUSH_DUMMY_FRAME \ | |
223 | { register CORE_ADDR sp = read_register (SP_REGNUM); \ | |
224 | register int regnum; \ | |
225 | printf("PUSH_DUMMY_FRAME\n"); \ | |
226 | sp = push_word (sp, read_register (FP_REGNUM)); \ | |
227 | write_register (FP_REGNUM, sp); \ | |
228 | sp = push_word (sp, 0x1fff0004); /*SAVE MASK*/ \ | |
229 | sp = push_word (sp, read_register (PC_REGNUM)); \ | |
230 | for (regnum = 12; regnum >= 0; regnum--) \ | |
231 | sp = push_word (sp, read_register (regnum)); \ | |
232 | write_register (SP_REGNUM, sp); \ | |
233 | } | |
234 | ||
235 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
236 | ||
237 | #define POP_FRAME \ | |
238 | { register CORE_ADDR fp = read_register (FP_REGNUM); \ | |
239 | register int regnum; \ | |
240 | register int regmask = read_memory_integer (fp-4, 4); \ | |
241 | printf("POP_FRAME\n"); \ | |
242 | regmask >>= 16; \ | |
243 | write_register (SP_REGNUM, fp+4); \ | |
244 | write_register (PC_REGNUM, read_memory_integer(fp-8, 4)); \ | |
245 | write_register (FP_REGNUM, read_memory_integer(fp, 4)); \ | |
246 | fp -= 8; \ | |
247 | for (regnum = 12; regnum >= 0; regnum--, regmask <<= 1) \ | |
248 | if (regmask & 0x1000) \ | |
249 | write_register (regnum, read_memory_integer (fp-=4, 4)); \ | |
250 | flush_cached_frames (); \ | |
251 | } | |
252 | ||
253 | /* This sequence of words is the instructions | |
254 | calls #69, @#32323232 | |
255 | bpt | |
256 | Note this is 8 bytes. */ | |
257 | ||
258 | #define CALL_DUMMY {0xbf699f32, 0x32323230} | |
259 | ||
260 | /* Start execution at beginning of dummy */ | |
261 | ||
262 | #define CALL_DUMMY_START_OFFSET 0 | |
263 | ||
264 | /* Insert the specified number of args and function address | |
265 | into a call sequence of the above form stored at DUMMYNAME. */ | |
266 | ||
267 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, valtype, using_gcc) \ | |
268 | { int temp = (int) fun; \ | |
269 | *((char *) dummyname + 1) = nargs; \ | |
270 | memcpy((char *)dummyname+3,&temp,4); } | |
271 |