1 /* Definitions to make GDB target for a tahoe running 4.3-Reno.
2 Copyright (C) 1986, 1987, 1989, 1991 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. */
21 * Ported by the State University of New York at Buffalo by the Distributed
22 * Computer Systems Lab, Department of Computer Science, 1991.
25 #define TARGET_BYTE_ORDER BIG_ENDIAN
26 #define BITS_BIG_ENDIAN 0
28 /* Define this if the C compiler puts an underscore at the front
29 of external names before giving them to the linker. */
31 #define NAMES_HAVE_UNDERSCORE
33 /* Offset from address of function to start of its code.
34 Zero on most machines. */
36 #define FUNCTION_START_OFFSET 2
38 /* Advance PC across any function entry prologue instructions
39 to reach some "real" code. */
41 #define SKIP_PROLOGUE(pc) \
42 { register int op = (unsigned char) read_memory_integer (pc, 1); \
43 if (op == 0x11) pc += 2; /* skip brb */ \
44 if (op == 0x13) pc += 3; /* skip brw */ \
46 ((unsigned char) read_memory_integer (pc+2, 1)) == 0x5e) \
47 pc += 3; /* skip subl2 */ \
49 ((unsigned char) read_memory_integer (pc+1, 1)) == 0xae && \
50 ((unsigned char) read_memory_integer(pc+3, 1)) == 0x5e) \
51 pc += 4; /* skip movab */ \
53 ((unsigned char) read_memory_integer (pc+1, 1)) == 0xce && \
54 ((unsigned char) read_memory_integer(pc+4, 1)) == 0x5e) \
55 pc += 5; /* skip movab */ \
57 ((unsigned char) read_memory_integer (pc+1, 1)) == 0xee && \
58 ((unsigned char) read_memory_integer(pc+6, 1)) == 0x5e) \
59 pc += 7; /* skip movab */ \
62 /* Immediately after a function call, return the saved pc.
63 Can't always go through the frames for this because on some machines
64 the new frame is not set up until the new function executes
67 #define SAVED_PC_AFTER_CALL(frame) FRAME_SAVED_PC(frame)
69 /* Wrong for cross-debugging. I don't know the real values. */
70 #include <machine/param.h>
71 #define TARGET_UPAGES UPAGES
72 #define TARGET_NBPG NBPG
74 /* This is the amount to subtract from u.u_ar0
75 to get the offset in the core file of the register values. */
77 #define KERNEL_U_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
79 /* Address of end of stack space. */
81 #define STACK_END_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
83 /* On BSD, sigtramp is in the u area. Can't check the exact
84 addresses because for cross-debugging we don't have target include
85 files around. This should be close enough. */
86 #define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0xc0000000))
88 /* Stack grows downward. */
92 /* Sequence of bytes for breakpoint instruction. */
94 #define BREAKPOINT {0x30}
96 /* Amount PC must be decremented by after a breakpoint.
97 This is often the number of bytes in BREAKPOINT
100 #define DECR_PC_AFTER_BREAK 0
102 /* Nonzero if instruction at PC is a return instruction. */
104 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x40)
106 /* Return 1 if P points to an invalid floating point value.
107 LEN is the length in bytes -- not relevant on the Tahoe. */
109 #define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
111 /* Say how long (ordinary) registers are. */
113 #define REGISTER_TYPE long
115 /* Number of machine registers */
119 /* Initializer for an array of names of registers.
120 There should be NUM_REGS strings in this initializer. */
122 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "fp", "sp", "pc", "ps", "al", "ah"}
124 #define FP_REGNUM 13 /* Contains address of executing stack frame */
125 #define SP_REGNUM 14 /* Contains address of top of stack */
126 #define PC_REGNUM 15 /* Contains program counter */
127 #define PS_REGNUM 16 /* Contains processor status */
129 #define AL_REGNUM 17 /* Contains accumulator */
132 /* Total amount of space needed to store our copies of the machine's
133 register state, the array `registers'. */
135 #define REGISTER_BYTES (19*4)
137 /* Index within `registers' of the first byte of the space for
140 #define REGISTER_BYTE(N) ((N) * 4)
142 /* Number of bytes of storage in the actual machine representation
143 for register N. On the tahoe, all regs are 4 bytes. */
145 #define REGISTER_RAW_SIZE(N) 4
147 /* Number of bytes of storage in the program's representation
148 for register N. On the tahoe, all regs are 4 bytes. */
150 #define REGISTER_VIRTUAL_SIZE(N) 4
152 /* Largest value REGISTER_RAW_SIZE can have. */
154 #define MAX_REGISTER_RAW_SIZE 4
156 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
158 #define MAX_REGISTER_VIRTUAL_SIZE 4
160 /* Nonzero if register N requires conversion
161 from raw format to virtual format. */
163 #define REGISTER_CONVERTIBLE(N) 0
165 /* Convert data from raw format for register REGNUM
166 to virtual format for register REGNUM. */
168 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
169 bcopy ((FROM), (TO), 4);
171 /* Convert data from virtual format for register REGNUM
172 to raw format for register REGNUM. */
174 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
175 bcopy ((FROM), (TO), 4);
177 /* Return the GDB type object for the "standard" data type
178 of data in register N. */
180 #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
182 /* Store the address of the place in which to copy the structure the
183 subroutine will return. This is called from call_function. */
185 #define STORE_STRUCT_RETURN(ADDR, SP) \
186 { write_register (1, (ADDR)); }
188 /* Extract from an array REGBUF containing the (raw) register state
189 a function return value of type TYPE, and copy that, in virtual format,
192 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
193 bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
195 /* Write into appropriate registers a function return value
196 of type TYPE, given in virtual format. */
198 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
199 write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
201 /* Extract from an array REGBUF containing the (raw) register state
202 the address in which a function should return its structure value,
203 as a CORE_ADDR (or an expression that can be used as one). */
205 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
207 /* Describe the pointer in each stack frame to the previous stack frame
210 FRAME_CHAIN takes a frame's nominal address
211 and produces the frame's chain-pointer.
213 However, if FRAME_CHAIN_VALID returns zero,
214 it means the given frame is the outermost one and has no caller. */
216 /* In the case of the Tahoe, the frame's nominal address is the FP value,
217 and it points to the old FP */
219 #define FRAME_CHAIN(thisframe) \
220 (outside_startup_file ((thisframe)->pc) ? \
221 read_memory_integer ((thisframe)->frame, 4) :\
224 #define FRAME_CHAIN_VALID(chain, thisframe) \
225 (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
227 /* Define other aspects of the stack frame. */
231 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame - 8, 4))
233 /* In most of GDB, getting the args address is too important to
234 just say "I don't know". */
236 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame+4)
238 /* Address to use as an anchor for finding local variables */
240 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
242 /* Return number of args passed to a frame.
243 Can return -1, meaning no way to tell. */
245 #define FRAME_NUM_ARGS(numargs, fi) \
246 { numargs = ((0xffff & read_memory_integer(((fi)->frame-4),4)) - 4) >> 2; }
248 /* Return number of bytes at start of arglist that are not really args. */
250 #define FRAME_ARGS_SKIP 0
252 /* Put here the code to store, into a struct frame_saved_regs,
253 the addresses of the saved registers of frame described by FRAME_INFO.
254 This includes special registers such as pc and fp saved in special
255 ways in the stack frame. sp is even more special:
256 the address we return for it IS the sp for the next frame. */
258 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
259 { register int regnum; \
260 register int rmask = read_memory_integer ((frame_info)->frame-4, 4) >> 16;\
261 register CORE_ADDR next_addr; \
262 bzero (&frame_saved_regs, sizeof frame_saved_regs); \
263 next_addr = (frame_info)->frame - 8; \
264 for (regnum = 12; regnum >= 0; regnum--, rmask <<= 1) \
265 (frame_saved_regs).regs[regnum] = (rmask & 0x1000) ? (next_addr -= 4) : 0;\
266 (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4; \
267 (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame - 8; \
268 (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \
271 /* Things needed for making the inferior call functions. */
273 /* Push an empty stack frame, to record the current PC, etc. */
275 #define PUSH_DUMMY_FRAME \
276 { register CORE_ADDR sp = read_register (SP_REGNUM); \
277 register int regnum; \
278 printf("PUSH_DUMMY_FRAME\n"); \
279 sp = push_word (sp, read_register (FP_REGNUM)); \
280 write_register (FP_REGNUM, sp); \
281 sp = push_word (sp, 0x1fff0004); /*SAVE MASK*/ \
282 sp = push_word (sp, read_register (PC_REGNUM)); \
283 for (regnum = 12; regnum >= 0; regnum--) \
284 sp = push_word (sp, read_register (regnum)); \
285 write_register (SP_REGNUM, sp); \
288 /* Discard from the stack the innermost frame, restoring all registers. */
291 { register CORE_ADDR fp = read_register (FP_REGNUM); \
292 register int regnum; \
293 register int regmask = read_memory_integer (fp-4, 4); \
294 printf("POP_FRAME\n"); \
296 write_register (SP_REGNUM, fp+4); \
297 write_register (PC_REGNUM, read_memory_integer(fp-8, 4)); \
298 write_register (FP_REGNUM, read_memory_integer(fp, 4)); \
300 for (regnum = 12; regnum >= 0; regnum--, regmask <<= 1) \
301 if (regmask & 0x1000) \
302 write_register (regnum, read_memory_integer (fp-=4, 4)); \
303 flush_cached_frames (); \
304 set_current_frame (create_new_frame (read_register (FP_REGNUM), \
307 /* This sequence of words is the instructions
308 calls #69, @#32323232
310 Note this is 8 bytes. */
312 #define CALL_DUMMY {0xbf699f32, 0x32323230}
314 /* Start execution at beginning of dummy */
316 #define CALL_DUMMY_START_OFFSET 0
318 /* Insert the specified number of args and function address
319 into a call sequence of the above form stored at DUMMYNAME. */
321 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, valtype, using_gcc) \
322 { int temp = (int) fun; \
323 *((char *) dummyname + 1) = nargs; \
324 bcopy(&temp,(char *)dummyname+3,4); }
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