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.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 /* Offset from address of function to start of its code.
29 Zero on most machines. */
31 #define FUNCTION_START_OFFSET 2
33 /* Advance PC across any function entry prologue instructions
34 to reach some "real" code. */
36 #define SKIP_PROLOGUE(pc) \
37 { register int op = (unsigned char) read_memory_integer (pc, 1); \
38 if (op == 0x11) pc += 2; /* skip brb */ \
39 if (op == 0x13) pc += 3; /* skip brw */ \
41 ((unsigned char) read_memory_integer (pc+2, 1)) == 0x5e) \
42 pc += 3; /* skip subl2 */ \
44 ((unsigned char) read_memory_integer (pc+1, 1)) == 0xae && \
45 ((unsigned char) read_memory_integer(pc+3, 1)) == 0x5e) \
46 pc += 4; /* skip movab */ \
48 ((unsigned char) read_memory_integer (pc+1, 1)) == 0xce && \
49 ((unsigned char) read_memory_integer(pc+4, 1)) == 0x5e) \
50 pc += 5; /* skip movab */ \
52 ((unsigned char) read_memory_integer (pc+1, 1)) == 0xee && \
53 ((unsigned char) read_memory_integer(pc+6, 1)) == 0x5e) \
54 pc += 7; /* skip movab */ \
57 /* Immediately after a function call, return the saved pc.
58 Can't always go through the frames for this because on some machines
59 the new frame is not set up until the new function executes
62 #define SAVED_PC_AFTER_CALL(frame) FRAME_SAVED_PC(frame)
64 /* Wrong for cross-debugging. I don't know the real values. */
65 #include <machine/param.h>
66 #define TARGET_UPAGES UPAGES
67 #define TARGET_NBPG NBPG
69 /* Address of end of stack space. */
71 #define STACK_END_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
73 /* On BSD, sigtramp is in the u area. Can't check the exact
74 addresses because for cross-debugging we don't have target include
75 files around. This should be close enough. */
76 #define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0xc0000000))
78 /* Stack grows downward. */
80 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
82 /* Sequence of bytes for breakpoint instruction. */
84 #define BREAKPOINT {0x30}
86 /* Amount PC must be decremented by after a breakpoint.
87 This is often the number of bytes in BREAKPOINT
90 #define DECR_PC_AFTER_BREAK 0
92 /* Return 1 if P points to an invalid floating point value.
93 LEN is the length in bytes -- not relevant on the Tahoe. */
95 #define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
97 /* Say how long (ordinary) registers are. This is a piece of bogosity
98 used in push_word and a few other places; REGISTER_RAW_SIZE is the
99 real way to know how big a register is. */
101 #define REGISTER_SIZE 4
103 /* Number of machine registers */
107 /* Initializer for an array of names of registers.
108 There should be NUM_REGS strings in this initializer. */
110 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "fp", "sp", "pc", "ps", "al", "ah"}
112 #define FP_REGNUM 13 /* Contains address of executing stack frame */
113 #define SP_REGNUM 14 /* Contains address of top of stack */
114 #define PC_REGNUM 15 /* Contains program counter */
115 #define PS_REGNUM 16 /* Contains processor status */
117 #define AL_REGNUM 17 /* Contains accumulator */
120 /* Total amount of space needed to store our copies of the machine's
121 register state, the array `registers'. */
123 #define REGISTER_BYTES (19*4)
125 /* Index within `registers' of the first byte of the space for
128 #define REGISTER_BYTE(N) ((N) * 4)
130 /* Number of bytes of storage in the actual machine representation
131 for register N. On the tahoe, all regs are 4 bytes. */
133 #define REGISTER_RAW_SIZE(N) 4
135 /* Number of bytes of storage in the program's representation
136 for register N. On the tahoe, all regs are 4 bytes. */
138 #define REGISTER_VIRTUAL_SIZE(N) 4
140 /* Largest value REGISTER_RAW_SIZE can have. */
142 #define MAX_REGISTER_RAW_SIZE 4
144 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
146 #define MAX_REGISTER_VIRTUAL_SIZE 4
148 /* Return the GDB type object for the "standard" data type
149 of data in register N. */
151 #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
153 /* Store the address of the place in which to copy the structure the
154 subroutine will return. This is called from call_function. */
156 #define STORE_STRUCT_RETURN(ADDR, SP) \
157 { write_register (1, (ADDR)); }
159 /* Extract from an array REGBUF containing the (raw) register state
160 a function return value of type TYPE, and copy that, in virtual format,
163 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
164 memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))
166 /* Write into appropriate registers a function return value
167 of type TYPE, given in virtual format. */
169 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
170 write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
172 /* Extract from an array REGBUF containing the (raw) register state
173 the address in which a function should return its structure value,
174 as a CORE_ADDR (or an expression that can be used as one). */
176 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
178 /* Describe the pointer in each stack frame to the previous stack frame
181 FRAME_CHAIN takes a frame's nominal address
182 and produces the frame's chain-pointer. */
184 /* In the case of the Tahoe, the frame's nominal address is the FP value,
185 and it points to the old FP */
187 #define FRAME_CHAIN(thisframe) \
188 (!inside_entry_file ((thisframe)->pc) ? \
189 read_memory_integer ((thisframe)->frame, 4) :\
192 /* Define other aspects of the stack frame. */
196 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame - 8, 4))
198 /* In most of GDB, getting the args address is too important to
199 just say "I don't know". */
201 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
203 /* Address to use as an anchor for finding local variables */
205 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
207 /* Return number of args passed to a frame.
208 Can return -1, meaning no way to tell. */
210 #define FRAME_NUM_ARGS(numargs, fi) \
211 { numargs = ((0xffff & read_memory_integer(((fi)->frame-4),4)) - 4) >> 2; }
213 /* Return number of bytes at start of arglist that are not really args. */
215 #define FRAME_ARGS_SKIP 0
217 /* Put here the code to store, into a struct frame_saved_regs,
218 the addresses of the saved registers of frame described by FRAME_INFO.
219 This includes special registers such as pc and fp saved in special
220 ways in the stack frame. sp is even more special:
221 the address we return for it IS the sp for the next frame. */
223 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
224 { register int regnum; \
225 register int rmask = read_memory_integer ((frame_info)->frame-4, 4) >> 16;\
226 register CORE_ADDR next_addr; \
227 memset (&frame_saved_regs, '\0', sizeof frame_saved_regs); \
228 next_addr = (frame_info)->frame - 8; \
229 for (regnum = 12; regnum >= 0; regnum--, rmask <<= 1) \
230 (frame_saved_regs).regs[regnum] = (rmask & 0x1000) ? (next_addr -= 4) : 0;\
231 (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4; \
232 (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame - 8; \
233 (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \
236 /* Things needed for making the inferior call functions. */
238 /* Push an empty stack frame, to record the current PC, etc. */
240 #define PUSH_DUMMY_FRAME \
241 { register CORE_ADDR sp = read_register (SP_REGNUM); \
242 register int regnum; \
243 printf("PUSH_DUMMY_FRAME\n"); \
244 sp = push_word (sp, read_register (FP_REGNUM)); \
245 write_register (FP_REGNUM, sp); \
246 sp = push_word (sp, 0x1fff0004); /*SAVE MASK*/ \
247 sp = push_word (sp, read_register (PC_REGNUM)); \
248 for (regnum = 12; regnum >= 0; regnum--) \
249 sp = push_word (sp, read_register (regnum)); \
250 write_register (SP_REGNUM, sp); \
253 /* Discard from the stack the innermost frame, restoring all registers. */
256 { register CORE_ADDR fp = read_register (FP_REGNUM); \
257 register int regnum; \
258 register int regmask = read_memory_integer (fp-4, 4); \
259 printf("POP_FRAME\n"); \
261 write_register (SP_REGNUM, fp+4); \
262 write_register (PC_REGNUM, read_memory_integer(fp-8, 4)); \
263 write_register (FP_REGNUM, read_memory_integer(fp, 4)); \
265 for (regnum = 12; regnum >= 0; regnum--, regmask <<= 1) \
266 if (regmask & 0x1000) \
267 write_register (regnum, read_memory_integer (fp-=4, 4)); \
268 flush_cached_frames (); \
271 /* This sequence of words is the instructions
272 calls #69, @#32323232
274 Note this is 8 bytes. */
276 #define CALL_DUMMY {0xbf699f32, 0x32323230}
278 /* Start execution at beginning of dummy */
280 #define CALL_DUMMY_START_OFFSET 0
282 /* Insert the specified number of args and function address
283 into a call sequence of the above form stored at DUMMYNAME. */
285 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, valtype, using_gcc) \
286 { int temp = (int) fun; \
287 *((char *) dummyname + 1) = nargs; \
288 memcpy((char *)dummyname+3,&temp,4); }
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