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git.ipfire.org Git - thirdparty/binutils-gdb.git/blob - gdb/config/vax/tm-vax.h
1 /* Definitions to make GDB run on a vax under 4.2bsd.
2 Copyright 1986, 1987, 1989, 1991, 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,
19 Boston, MA 02111-1307, USA. */
22 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
24 /* Offset from address of function to start of its code.
25 Zero on most machines. */
27 #define FUNCTION_START_OFFSET 2
29 /* Advance PC across any function entry prologue instructions
30 to reach some "real" code. */
32 extern CORE_ADDR
vax_skip_prologue (CORE_ADDR
);
33 #define SKIP_PROLOGUE(pc) (vax_skip_prologue (pc))
35 /* Immediately after a function call, return the saved pc.
36 Can't always go through the frames for this because on some machines
37 the new frame is not set up until the new function executes
40 #define SAVED_PC_AFTER_CALL(frame) FRAME_SAVED_PC(frame)
42 #define TARGET_UPAGES 14
43 #define TARGET_NBPG 512
44 #define STACK_END_ADDR (0x80000000 - (TARGET_UPAGES * TARGET_NBPG))
46 /* On the VAX, sigtramp is in the u area. Can't check the exact
47 addresses because for cross-debugging we don't have VAX include
48 files around. This should be close enough. */
49 #define SIGTRAMP_START(pc) STACK_END_ADDR
50 #define SIGTRAMP_END(pc) 0x80000000
52 /* Stack grows downward. */
54 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
56 /* Sequence of bytes for breakpoint instruction. */
58 #define BREAKPOINT {3}
60 /* Amount PC must be decremented by after a breakpoint.
61 This is often the number of bytes in BREAKPOINT
64 #define DECR_PC_AFTER_BREAK 0
66 /* Return 1 if P points to an invalid floating point value.
67 LEN is the length in bytes -- not relevant on the Vax. */
69 #define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
71 /* Say how long (ordinary) registers are. This is a piece of bogosity
72 used in push_word and a few other places; REGISTER_RAW_SIZE is the
73 real way to know how big a register is. */
75 #define REGISTER_SIZE 4
77 /* Number of machine registers */
81 /* Initializer for an array of names of registers.
82 There should be NUM_REGS strings in this initializer. */
84 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", "ps"}
86 /* Register numbers of various important registers.
87 Note that some of these values are "real" register numbers,
88 and correspond to the general registers of the machine,
89 and some are "phony" register numbers which are too large
90 to be actual register numbers as far as the user is concerned
91 but do serve to get the desired values when passed to read_register. */
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 */
99 /* Total amount of space needed to store our copies of the machine's
100 register state, the array `registers'. */
101 #define REGISTER_BYTES (17*4)
103 /* Index within `registers' of the first byte of the space for
106 #define REGISTER_BYTE(N) ((N) * 4)
108 /* Number of bytes of storage in the actual machine representation
109 for register N. On the vax, all regs are 4 bytes. */
111 #define REGISTER_RAW_SIZE(N) 4
113 /* Number of bytes of storage in the program's representation
114 for register N. On the vax, all regs are 4 bytes. */
116 #define REGISTER_VIRTUAL_SIZE(N) 4
118 /* Largest value REGISTER_RAW_SIZE can have. */
120 #define MAX_REGISTER_RAW_SIZE 4
122 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
124 #define MAX_REGISTER_VIRTUAL_SIZE 4
126 /* Return the GDB type object for the "standard" data type
127 of data in register N. */
129 #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
131 /* Store the address of the place in which to copy the structure the
132 subroutine will return. This is called from call_function. */
134 #define STORE_STRUCT_RETURN(ADDR, SP) \
135 { write_register (1, (ADDR)); }
137 /* Extract from an array REGBUF containing the (raw) register state
138 a function return value of type TYPE, and copy that, in virtual format,
141 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
142 memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))
144 /* Write into appropriate registers a function return value
145 of type TYPE, given in virtual format. */
147 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
148 write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
150 /* Extract from an array REGBUF containing the (raw) register state
151 the address in which a function should return its structure value,
152 as a CORE_ADDR (or an expression that can be used as one). */
154 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
157 /* Describe the pointer in each stack frame to the previous stack frame
160 /* FRAME_CHAIN takes a frame's nominal address
161 and produces the frame's chain-pointer. */
163 /* In the case of the Vax, the frame's nominal address is the FP value,
164 and 12 bytes later comes the saved previous FP value as a 4-byte word. */
166 #define FRAME_CHAIN(thisframe) \
167 (!inside_entry_file ((thisframe)->pc) ? \
168 read_memory_integer ((thisframe)->frame + 12, 4) :\
171 /* Define other aspects of the stack frame. */
173 /* A macro that tells us whether the function invocation represented
174 by FI does not have a frame on the stack associated with it. If it
175 does not, FRAMELESS is set to 1, else 0. */
176 /* On the vax, all functions have frames. */
177 #define FRAMELESS_FUNCTION_INVOCATION(FI) (0)
179 /* Saved Pc. Get it from sigcontext if within sigtramp. */
181 /* Offset to saved PC in sigcontext, from <sys/signal.h>. */
182 #define SIGCONTEXT_PC_OFFSET 12
184 #define FRAME_SAVED_PC(FRAME) \
185 (((FRAME)->signal_handler_caller \
186 ? sigtramp_saved_pc (FRAME) \
187 : read_memory_integer ((FRAME)->frame + 16, 4)) \
190 /* Cannot find the AP register value directly from the FP value. Must
191 find it saved in the frame called by this one, or in the AP
192 register for the innermost frame. However, there is no way to tell
193 the difference between the innermost frame and a frame for which we
194 just don't know the frame that it called (e.g. "info frame
195 0x7ffec789"). For the sake of argument suppose that the stack is
196 somewhat trashed (which is one reason that "info frame" exists).
197 So return 0 (indicating we don't know the address of
198 the arglist) if we don't know what frame this frame calls. */
199 #define FRAME_ARGS_ADDRESS_CORRECT(fi) \
201 ? read_memory_integer ((fi)->next->frame + 8, 4) \
202 : /* read_register (AP_REGNUM) */ 0))
204 /* In most of GDB, getting the args address is too important to
205 just say "I don't know". This is sometimes wrong for functions
206 that aren't on top of the stack, but c'est la vie. */
207 #define FRAME_ARGS_ADDRESS(fi) \
209 ? read_memory_integer ((fi)->next->frame + 8, 4) \
210 : read_register (AP_REGNUM) /* 0 */))
212 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
214 /* Return number of args passed to a frame.
215 Can return -1, meaning no way to tell. */
217 extern int vax_frame_num_args (struct frame_info
*fi
);
218 #define FRAME_NUM_ARGS(fi) (vax_frame_num_args ((fi)))
220 /* Return number of bytes at start of arglist that are not really args. */
222 #define FRAME_ARGS_SKIP 4
224 /* Put here the code to store, into a struct frame_saved_regs,
225 the addresses of the saved registers of frame described by FRAME_INFO.
226 This includes special registers such as pc and fp saved in special
227 ways in the stack frame. sp is even more special:
228 the address we return for it IS the sp for the next frame. */
230 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
231 { register int regnum; \
232 register int regmask = read_memory_integer ((frame_info)->frame+4, 4) >> 16; \
233 register CORE_ADDR next_addr; \
234 memset (&frame_saved_regs, '\0', sizeof frame_saved_regs); \
235 next_addr = (frame_info)->frame + 16; \
236 /* Regmask's low bit is for register 0, \
237 which is the first one that would be pushed. */ \
238 for (regnum = 0; regnum < 12; regnum++, regmask >>= 1) \
239 (frame_saved_regs).regs[regnum] = (regmask & 1) ? (next_addr += 4) : 0; \
240 (frame_saved_regs).regs[SP_REGNUM] = next_addr + 4; \
241 if (read_memory_integer ((frame_info)->frame + 4, 4) & 0x20000000) \
242 (frame_saved_regs).regs[SP_REGNUM] += 4 + 4 * read_memory_integer (next_addr + 4, 4); \
243 (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 16; \
244 (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame + 12; \
245 (frame_saved_regs).regs[AP_REGNUM] = (frame_info)->frame + 8; \
246 (frame_saved_regs).regs[PS_REGNUM] = (frame_info)->frame + 4; \
249 /* Things needed for making the inferior call functions. */
251 /* Push an empty stack frame, to record the current PC, etc. */
253 #define PUSH_DUMMY_FRAME \
254 { register CORE_ADDR sp = read_register (SP_REGNUM);\
255 register int regnum; \
256 sp = push_word (sp, 0); /* arglist */ \
257 for (regnum = 11; regnum >= 0; regnum--) \
258 sp = push_word (sp, read_register (regnum)); \
259 sp = push_word (sp, read_register (PC_REGNUM)); \
260 sp = push_word (sp, read_register (FP_REGNUM)); \
261 sp = push_word (sp, read_register (AP_REGNUM)); \
262 sp = push_word (sp, (read_register (PS_REGNUM) & 0xffef) \
264 sp = push_word (sp, 0); \
265 write_register (SP_REGNUM, sp); \
266 write_register (FP_REGNUM, sp); \
267 write_register (AP_REGNUM, sp + 17 * sizeof (int)); }
269 /* Discard from the stack the innermost frame, restoring all registers. */
272 { register CORE_ADDR fp = read_register (FP_REGNUM); \
273 register int regnum; \
274 register int regmask = read_memory_integer (fp + 4, 4); \
275 write_register (PS_REGNUM, \
277 | (read_register (PS_REGNUM) & 0xffff0000)); \
278 write_register (PC_REGNUM, read_memory_integer (fp + 16, 4)); \
279 write_register (FP_REGNUM, read_memory_integer (fp + 12, 4)); \
280 write_register (AP_REGNUM, read_memory_integer (fp + 8, 4)); \
282 for (regnum = 0; regnum < 12; regnum++) \
283 if (regmask & (0x10000 << regnum)) \
284 write_register (regnum, read_memory_integer (fp += 4, 4)); \
285 fp = fp + 4 + ((regmask >> 30) & 3); \
286 if (regmask & 0x20000000) \
287 { regnum = read_memory_integer (fp, 4); \
288 fp += (regnum + 1) * 4; } \
289 write_register (SP_REGNUM, fp); \
290 flush_cached_frames (); \
293 /* This sequence of words is the instructions
294 calls #69, @#32323232
296 Note this is 8 bytes. */
298 #define CALL_DUMMY {0x329f69fb, 0x03323232}
300 #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */
302 #define CALL_DUMMY_BREAKPOINT_OFFSET 7
304 /* Insert the specified number of args and function address
305 into a call sequence of the above form stored at DUMMYNAME. */
307 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
308 { *((char *) dummyname + 1) = nargs; \
309 *(int *)((char *) dummyname + 3) = fun; }
311 /* If vax pcc says CHAR or SHORT, it provides the correct address. */
313 #define BELIEVE_PCC_PROMOTION 1