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., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
24 #undef TARGET_LONG_BIT
25 #undef TARGET_SHORT_BIT
28 #define TARGET_SHORT_BIT 16
29 #define TARGET_INT_BIT 16
30 #define TARGET_LONG_BIT 32
31 #define TARGET_PTR_BIT (BIG ? 32: 16)
33 /* Define the bit, byte, and word ordering of the machine. */
34 #define TARGET_BYTE_ORDER BIG_ENDIAN
36 /* Offset from address of function to start of its code.
37 Zero on most machines. */
39 #define FUNCTION_START_OFFSET 0
41 /* Advance PC across any function entry prologue instructions
42 to reach some "real" code. */
44 #define SKIP_PROLOGUE(ip) (z8k_skip_prologue (ip))
45 extern CORE_ADDR mz8k_skip_prologue
PARAMS ((CORE_ADDR ip
));
48 /* Immediately after a function call, return the saved pc.
49 Can't always go through the frames for this because on some machines
50 the new frame is not set up until the new function executes
53 #define SAVED_PC_AFTER_CALL(frame) saved_pc_after_call(frame)
55 /* Stack grows downward. */
57 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
59 /* Sequence of bytes for breakpoint instruction. */
61 #define BREAKPOINT {0x36,0x00}
63 /* If your kernel resets the pc after the trap happens you may need to
64 define this before including this file. */
66 #define DECR_PC_AFTER_BREAK 0
68 /* Say how long registers are. */
70 #define REGISTER_TYPE unsigned int
72 #define NUM_REGS 23 /* 16 registers + 1 ccr + 1 pc + 3 debug
73 regs + fake fp + fake sp */
74 #define REGISTER_BYTES (NUM_REGS *4)
76 /* Index within `registers' of the first byte of the space for
79 #define REGISTER_BYTE(N) ((N)*4)
81 /* Number of bytes of storage in the actual machine representation
82 for register N. On the z8k, all but the pc are 2 bytes, but we
83 keep them all as 4 bytes and trim them on I/O */
86 #define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)
88 /* Number of bytes of storage in the program's representation
91 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
93 /* Largest value REGISTER_RAW_SIZE can have. */
95 #define MAX_REGISTER_RAW_SIZE 4
97 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
99 #define MAX_REGISTER_VIRTUAL_SIZE 4
101 /* Return the GDB type object for the "standard" data type
102 of data in register N. */
104 #define REGISTER_VIRTUAL_TYPE(N) \
105 (REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long)
107 /*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y) */
108 /* Initializer for an array of names of registers.
109 Entries beyond the first NUM_REGS are ignored. */
111 #define REGISTER_NAMES \
112 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
113 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
114 "ccr", "pc", "cycles","insts","time","fp","sp"}
116 /* Register numbers of various important registers.
117 Note that some of these values are "real" register numbers,
118 and correspond to the general registers of the machine,
119 and some are "phony" register numbers which are too large
120 to be actual register numbers as far as the user is concerned
121 but do serve to get the desired values when passed to read_register. */
123 #define CCR_REGNUM 16 /* Contains processor status */
124 #define PC_REGNUM 17 /* Contains program counter */
125 #define CYCLES_REGNUM 18
126 #define INSTS_REGNUM 19
127 #define TIME_REGNUM 20
128 #define FP_REGNUM 21 /* Contains fp, whatever memory model */
129 #define SP_REGNUM 22 /* Conatins sp, whatever memory model */
133 #define PTR_SIZE (BIG ? 4: 2)
134 #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
136 /* Store the address of the place in which to copy the structure the
137 subroutine will return. This is called from call_function. */
139 #define STORE_STRUCT_RETURN(ADDR, SP) abort();
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. This is assuming that floating point values are returned
144 as doubles in d0/d1. */
147 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
148 memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), TYPE_LENGTH(TYPE));
150 /* Write into appropriate registers a function return value
151 of type TYPE, given in virtual format. */
153 #define STORE_RETURN_VALUE(TYPE,VALBUF) abort();
155 /* Extract from an array REGBUF containing the (raw) register state
156 the address in which a function should return its structure value,
157 as a CORE_ADDR (or an expression that can be used as one). */
159 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
161 /* Describe the pointer in each stack frame to the previous stack frame
164 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
166 In the case of the Z8000, the frame's nominal address
167 is the address of a ptr sized byte word containing the calling
170 #define FRAME_CHAIN(thisframe) frame_chain(thisframe);
174 /* Define other aspects of the stack frame. */
176 /* A macro that tells us whether the function invocation represented
177 by FI does not have a frame on the stack associated with it. If it
178 does not, FRAMELESS is set to 1, else 0. */
179 #define FRAMELESS_FUNCTION_INVOCATION(FI) \
180 (frameless_look_for_prologue (FI))
182 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
184 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
186 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
188 /* Set VAL to the number of args passed to frame described by FI.
189 Can set VAL to -1, meaning no way to tell. */
191 /* We can't tell how many args there are
192 now that the C compiler delays popping them. */
193 #if !defined (FRAME_NUM_ARGS)
194 #define FRAME_NUM_ARGS(fi) (-1)
197 /* Return number of bytes at start of arglist that are not really args. */
199 #define FRAME_ARGS_SKIP 8
202 extern void z8k_frame_init_saved_regs
PARAMS ((struct frame_info
*));
203 #define FRAME_INIT_SAVED_REGS(fi) z8k_frame_init_saved_regs (fi)
206 /* Things needed for making the inferior call functions.
207 It seems like every m68k based machine has almost identical definitions
208 in the individual machine's configuration files. Most other cpu types
209 (mips, i386, etc) have routines in their *-tdep.c files to handle this
210 for most configurations. The m68k family should be able to do this as
211 well. These macros can still be overridden when necessary. */
213 /* The CALL_DUMMY macro is the sequence of instructions, as disassembled
216 fmovemx fp0-fp7,sp@- 0xf227 0xe0ff
217 moveml d0-a5,sp@- 0x48e7 0xfffc
219 movew ccr,sp@- 0x42e7
221 /..* The arguments are pushed at this point by GDB;
222 no code is needed in the dummy for this.
223 The CALL_DUMMY_START_OFFSET gives the position of
224 the following jsr instruction. *../
226 jsr @#0x32323232 0x4eb9 0x3232 0x3232
227 addal #0x69696969,sp 0xdffc 0x6969 0x6969
228 trap #<your BPT_VECTOR number here> 0x4e4?
231 Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
232 We actually start executing at the jsr, since the pushing of the
233 registers is done by PUSH_DUMMY_FRAME. If this were real code,
234 the arguments for the function called by the jsr would be pushed
235 between the moveml and the jsr, and we could allow it to execute through.
236 But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
237 done, and we cannot allow the moveml to push the registers again lest
238 they be taken for the arguments. */
241 #define CALL_DUMMY { 0 }
242 #define CALL_DUMMY_LENGTH 24 /* Size of CALL_DUMMY */
243 #define CALL_DUMMY_START_OFFSET 8 /* Offset to jsr instruction */
246 /* Insert the specified number of args and function address
247 into a call sequence of the above form stored at DUMMYNAME.
248 We use the BFD routines to store a big-endian value of known size. */
250 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
251 { bfd_putb32 (fun, (char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \
252 bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
254 /* Push an empty stack frame, to record the current PC, etc. */
256 #define PUSH_DUMMY_FRAME { z8k_push_dummy_frame (); }
258 extern void z8k_push_dummy_frame
PARAMS ((void));
260 extern void z8k_pop_frame
PARAMS ((void));
262 /* Discard from the stack the innermost frame, restoring all registers. */
264 #define POP_FRAME { z8k_pop_frame (); }
266 /* Offset from SP to first arg on stack at first instruction of a function */
268 #define SP_ARG0 (1 * 4)
270 extern CORE_ADDR z8k_addr_bits_remove
PARAMS ((CORE_ADDR
));
271 #define ADDR_BITS_REMOVE(addr) z8k_addr_bits_remove (addr)
273 #define BIG (sim_z8001_mode)
275 #define read_memory_short(x) (read_memory_integer(x,2) & 0xffff)
279 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
282 #define INIT_EXTRA_SYMTAB_INFO \
283 z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);
285 #define REGISTER_SIZE 4