1 /* Parameters for execution on a z8000 series machine.
2 Copyright 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
22 #define TARGET_SHORT_BIT 16
23 #define TARGET_INT_BIT 16
24 #define TARGET_LONG_BIT 32
25 #define TARGET_PTR_BIT (BIG ? 32: 16)
27 /* Define the bit, byte, and word ordering of the machine. */
28 #define TARGET_BYTE_ORDER BIG_ENDIAN
30 /* Offset from address of function to start of its code.
31 Zero on most machines. */
33 #define FUNCTION_START_OFFSET 0
35 /* Advance PC across any function entry prologue instructions
36 to reach some "real" code. */
38 #define SKIP_PROLOGUE(ip) {(ip) = z8k_skip_prologue(ip);}
39 extern CORE_ADDR mz8k_skip_prologue PARAMS ((CORE_ADDR ip));
42 /* Immediately after a function call, return the saved pc.
43 Can't always go through the frames for this because on some machines
44 the new frame is not set up until the new function executes
47 #define SAVED_PC_AFTER_CALL(frame) saved_pc_after_call(frame)
49 /* Stack grows downward. */
53 /* Sequence of bytes for breakpoint instruction. */
55 #define BREAKPOINT {0x36,0x00}
57 /* If your kernel resets the pc after the trap happens you may need to
58 define this before including this file. */
60 #define DECR_PC_AFTER_BREAK 0
62 /* Nonzero if instruction at PC is a return instruction. */
63 /* Allow any of the return instructions, including a trapv and a return
66 #define ABOUT_TO_RETURN(pc) about_to_return(pc)
68 /* Return 1 if P points to an invalid floating point value. */
70 #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
72 /* Say how long (ordinary) registers are. This is a piece of bogosity
73 used in push_word and a few other places; REGISTER_RAW_SIZE is the
74 real way to know how big a register is. */
76 #define REGISTER_SIZE 4
78 #define NUM_REGS 23 /* 16 registers + 1 ccr + 1 pc + 3 debug
79 regs + fake fp + fake sp*/
80 #define REGISTER_BYTES (NUM_REGS *4)
82 /* Index within `registers' of the first byte of the space for
85 #define REGISTER_BYTE(N) ((N)*4)
87 /* Number of bytes of storage in the actual machine representation
88 for register N. On the z8k, all but the pc are 2 bytes, but we
89 keep them all as 4 bytes and trim them on I/O */
92 #define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)
94 /* Number of bytes of storage in the program's representation
97 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
99 /* Largest value REGISTER_RAW_SIZE can have. */
101 #define MAX_REGISTER_RAW_SIZE 4
103 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
105 #define MAX_REGISTER_VIRTUAL_SIZE 4
107 /* Return the GDB type object for the "standard" data type
108 of data in register N. */
110 #define REGISTER_VIRTUAL_TYPE(N) \
111 (REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long)
113 /*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y)*/
114 /* Initializer for an array of names of registers.
115 Entries beyond the first NUM_REGS are ignored. */
117 #define REGISTER_NAMES \
118 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
119 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
120 "ccr", "pc", "cycles","insts","time","fp","sp"}
122 /* Register numbers of various important registers.
123 Note that some of these values are "real" register numbers,
124 and correspond to the general registers of the machine,
125 and some are "phony" register numbers which are too large
126 to be actual register numbers as far as the user is concerned
127 but do serve to get the desired values when passed to read_register. */
129 #define CCR_REGNUM 16 /* Contains processor status */
130 #define PC_REGNUM 17 /* Contains program counter */
131 #define CYCLES_REGNUM 18
132 #define INSTS_REGNUM 19
133 #define TIME_REGNUM 20
134 #define FP_REGNUM 21 /* Contains fp, whatever memory model */
135 #define SP_REGNUM 22 /* Conatins sp, whatever memory model */
139 #define PTR_SIZE (BIG ? 4: 2)
140 #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
142 /* Store the address of the place in which to copy the structure the
143 subroutine will return. This is called from call_function. */
145 #define STORE_STRUCT_RETURN(ADDR, SP) abort();
147 /* Extract from an array REGBUF containing the (raw) register state
148 a function return value of type TYPE, and copy that, in virtual format,
149 into VALBUF. This is assuming that floating point values are returned
150 as doubles in d0/d1. */
153 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
154 memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), TYPE_LENGTH(TYPE));
156 /* Write into appropriate registers a function return value
157 of type TYPE, given in virtual format. */
159 #define STORE_RETURN_VALUE(TYPE,VALBUF) abort();
161 /* Extract from an array REGBUF containing the (raw) register state
162 the address in which a function should return its structure value,
163 as a CORE_ADDR (or an expression that can be used as one). */
165 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
167 /* Describe the pointer in each stack frame to the previous stack frame
170 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
172 In the case of the Z8000, the frame's nominal address
173 is the address of a ptr sized byte word containing the calling
176 #define FRAME_CHAIN(thisframe) frame_chain(thisframe);
180 /* Define other aspects of the stack frame. */
182 /* A macro that tells us whether the function invocation represented
183 by FI does not have a frame on the stack associated with it. If it
184 does not, FRAMELESS is set to 1, else 0. */
185 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
186 (FRAMELESS) = frameless_look_for_prologue(FI)
188 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
190 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
192 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
194 /* Set VAL to the number of args passed to frame described by FI.
195 Can set VAL to -1, meaning no way to tell. */
197 /* We can't tell how many args there are
198 now that the C compiler delays popping them. */
199 #if !defined (FRAME_NUM_ARGS)
200 #define FRAME_NUM_ARGS(val,fi) (val = -1)
203 /* Return number of bytes at start of arglist that are not really args. */
205 #define FRAME_ARGS_SKIP 8
209 /* Things needed for making the inferior call functions.
210 It seems like every m68k based machine has almost identical definitions
211 in the individual machine's configuration files. Most other cpu types
212 (mips, i386, etc) have routines in their *-tdep.c files to handle this
213 for most configurations. The m68k family should be able to do this as
214 well. These macros can still be overridden when necessary. */
216 /* The CALL_DUMMY macro is the sequence of instructions, as disassembled
219 fmovemx fp0-fp7,sp@- 0xf227 0xe0ff
220 moveml d0-a5,sp@- 0x48e7 0xfffc
222 movew ccr,sp@- 0x42e7
224 /..* The arguments are pushed at this point by GDB;
225 no code is needed in the dummy for this.
226 The CALL_DUMMY_START_OFFSET gives the position of
227 the following jsr instruction. *../
229 jsr @#0x32323232 0x4eb9 0x3232 0x3232
230 addal #0x69696969,sp 0xdffc 0x6969 0x6969
231 trap #<your BPT_VECTOR number here> 0x4e4?
234 Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
235 We actually start executing at the jsr, since the pushing of the
236 registers is done by PUSH_DUMMY_FRAME. If this were real code,
237 the arguments for the function called by the jsr would be pushed
238 between the moveml and the jsr, and we could allow it to execute through.
239 But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
240 done, and we cannot allow the moveml to push the registers again lest
241 they be taken for the arguments. */
244 #define CALL_DUMMY { 0 }
245 #define CALL_DUMMY_LENGTH 24 /* Size of CALL_DUMMY */
246 #define CALL_DUMMY_START_OFFSET 8 /* Offset to jsr instruction*/
249 /* Insert the specified number of args and function address
250 into a call sequence of the above form stored at DUMMYNAME.
251 We use the BFD routines to store a big-endian value of known size. */
253 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
254 { bfd_putb32 (fun, (char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \
255 bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
257 /* Push an empty stack frame, to record the current PC, etc. */
259 #define PUSH_DUMMY_FRAME { z8k_push_dummy_frame (); }
261 extern void z8k_push_dummy_frame PARAMS ((void));
263 extern void z8k_pop_frame PARAMS ((void));
265 /* Discard from the stack the innermost frame, restoring all registers. */
267 #define POP_FRAME { z8k_pop_frame (); }
269 /* Offset from SP to first arg on stack at first instruction of a function */
271 #define SP_ARG0 (1 * 4)
273 #define ADDR_BITS_REMOVE(x) addr_bits_remove(x)
275 #define BIG (sim_z8001_mode)
277 #define read_memory_short(x) (read_memory_integer(x,2) & 0xffff)
281 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
284 #define INIT_EXTRA_SYMTAB_INFO \
285 z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);