1 /* Parameters for a Sun 386i target machine, for GDB, the GNU debugger.
2 Copyright 1986, 1987, 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
20 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
25 #define GDB_TARGET_IS_SUN386 1
27 #define USE_MACHINE_REG_H
29 /* Perhaps some day this will work even without the following #define */
30 #define COFF_ENCAPSULATE
32 #ifdef COFF_ENCAPSULATE
33 /* Avoid conflicts between our include files and <sys/exec.h>
34 (maybe not needed anymore). */
38 /* sun386 ptrace seems unable to change the frame pointer */
41 /* Offset from address of function to start of its code.
42 Zero on most machines. */
44 #define FUNCTION_START_OFFSET 0
46 /* Advance PC across any function entry prologue instructions
47 to reach some "real" code. */
49 #define SKIP_PROLOGUE(frompc) {(frompc) = i386_skip_prologue((frompc));}
52 i386_skip_prologue
PARAMS ((int));
54 /* Immediately after a function call, return the saved pc.
55 Can't always go through the frames for this because on some machines
56 the new frame is not set up until the new function executes
59 #define SAVED_PC_AFTER_CALL(frame) \
60 (read_memory_integer (read_register (SP_REGNUM), 4))
62 /* Address of end of stack space. */
64 #define STACK_END_ADDR 0xfc000000
66 /* Stack grows downward. */
70 /* Sequence of bytes for breakpoint instruction. */
72 #define BREAKPOINT {0xcc}
74 /* Amount PC must be decremented by after a breakpoint.
75 This is often the number of bytes in BREAKPOINT
78 #define DECR_PC_AFTER_BREAK 1
80 /* Nonzero if instruction at PC is a return instruction. */
82 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc3)
84 /* Return 1 if P points to an invalid floating point value.
85 LEN is the length in bytes -- not relevant on the 386. */
87 #define INVALID_FLOAT(p, len) (0)
89 /* Say how long (ordinary) registers are. This is a piece of bogosity
90 used in push_word and a few other places; REGISTER_RAW_SIZE is the
91 real way to know how big a register is. */
93 #define REGISTER_SIZE 4
95 /* Number of machine registers */
99 /* Initializer for an array of names of registers.
100 There should be NUM_REGS strings in this initializer. */
102 /* the order of the first 8 registers must match the compiler's
103 * numbering scheme (which is the same as the 386 scheme)
104 * also, this table must match regmap in i386-pinsn.c.
106 #define REGISTER_NAMES { "gs", "fs", "es", "ds", \
107 "edi", "esi", "ebp", "esp", \
108 "ebx", "edx", "ecx", "eax", \
109 "retaddr", "trapnum", "errcode", "ip", \
110 "cs", "ps", "sp", "ss", \
111 "fst0", "fst1", "fst2", "fst3", \
112 "fst4", "fst5", "fst6", "fst7", \
113 "fctrl", "fstat", "ftag", "fip", \
114 "fcs", "fopoff", "fopsel" \
117 /* Register numbers of various important registers.
118 Note that some of these values are "real" register numbers,
119 and correspond to the general registers of the machine,
120 and some are "phony" register numbers which are too large
121 to be actual register numbers as far as the user is concerned
122 but do serve to get the desired values when passed to read_register. */
124 #define FP_REGNUM 6 /* Contains address of executing stack frame */
125 #define SP_REGNUM 18 /* Contains address of top of stack */
126 #define PS_REGNUM 17 /* Contains processor status */
127 #define PC_REGNUM 15 /* Contains program counter */
128 #define FP0_REGNUM 20 /* Floating point register 0 */
129 #define FPC_REGNUM 28 /* 80387 control register */
131 /* Total amount of space needed to store our copies of the machine's
132 register state, the array `registers'. */
133 #define REGISTER_BYTES (20*4+8*10+7*4)
135 /* Index within `registers' of the first byte of the space for
138 #define REGISTER_BYTE(N) \
139 ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 160 \
140 : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 10) + 80 \
143 /* Number of bytes of storage in the actual machine representation
146 #define REGISTER_RAW_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 10 : 4)
148 /* Number of bytes of storage in the program's representation
151 #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 8 : 4)
153 /* Largest value REGISTER_RAW_SIZE can have. */
155 #define MAX_REGISTER_RAW_SIZE 10
157 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
159 #define MAX_REGISTER_VIRTUAL_SIZE 8
161 /* Nonzero if register N requires conversion
162 from raw format to virtual format. */
164 #define REGISTER_CONVERTIBLE(N) (((unsigned)((N) - FP0_REGNUM)) < 8)
166 /* Convert data from raw format for register REGNUM in buffer FROM
167 to virtual format with type TYPE in buffer TO. */
169 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
172 i387_to_double ((FROM), (char *)&val); \
173 store_floating ((TO), TYPE_LENGTH (TYPE), val); \
176 i387_to_double
PARAMS ((char *, char *));
178 /* Convert data from virtual format with type TYPE in buffer FROM
179 to raw format for register REGNUM in buffer TO. */
181 #define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \
183 double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
184 double_to_i387((char *)&val, (TO))) \
187 double_to_i387
PARAMS ((char *, char *));
189 /* Return the GDB type object for the "standard" data type
190 of data in register N. */
192 #define REGISTER_VIRTUAL_TYPE(N) \
193 (((unsigned)((N) - FP0_REGNUM)) < 8 ? builtin_type_double : builtin_type_int)
195 /* Store the address of the place in which to copy the structure the
196 subroutine will return. This is called from call_function. */
198 #define STORE_STRUCT_RETURN(ADDR, SP) \
199 { (SP) -= sizeof (ADDR); \
200 write_memory ((SP), &(ADDR), sizeof (ADDR)); }
202 /* Extract from an array REGBUF containing the (raw) register state
203 a function return value of type TYPE, and copy that, in virtual format,
206 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
207 memcpy (VALBUF, REGBUF + REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), TYPE_LENGTH (TYPE))
209 /* Write into appropriate registers a function return value
210 of type TYPE, given in virtual format. */
212 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
213 write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE))
215 /* Extract from an array REGBUF containing the (raw) register state
216 the address in which a function should return its structure value,
217 as a CORE_ADDR (or an expression that can be used as one). */
219 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
221 /* Describe the pointer in each stack frame to the previous stack frame
224 /* FRAME_CHAIN takes a frame's nominal address
225 and produces the frame's chain-pointer. */
227 #define FRAME_CHAIN(thisframe) \
228 (!inside_entry_file ((thisframe)->pc) ? \
229 read_memory_integer ((thisframe)->frame, 4) :\
232 /* Define other aspects of the stack frame. */
234 /* A macro that tells us whether the function invocation represented
235 by FI does not have a frame on the stack associated with it. If it
236 does not, FRAMELESS is set to 1, else 0. */
237 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
238 { (FRAMELESS) = frameless_look_for_prologue (FI); }
240 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
242 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
244 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
246 /* Return number of args passed to a frame.
247 Can return -1, meaning no way to tell. */
249 #define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi)
251 #ifdef __STDC__ /* Forward decl's for prototypes */
253 struct frame_saved_regs
;
257 i386_frame_num_args
PARAMS ((struct frame_info
*));
259 /* Return number of bytes at start of arglist that are not really args. */
261 #define FRAME_ARGS_SKIP 8
263 /* Put here the code to store, into a struct frame_saved_regs,
264 the addresses of the saved registers of frame described by FRAME_INFO.
265 This includes special registers such as pc and fp saved in special
266 ways in the stack frame. sp is even more special:
267 the address we return for it IS the sp for the next frame. */
269 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
270 { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); }
273 i386_frame_find_saved_regs
PARAMS ((struct frame_info
*,
274 struct frame_saved_regs
*));
277 /* Things needed for making the inferior call functions. */
279 /* Push an empty stack frame, to record the current PC, etc. */
281 #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); }
284 i386_push_dummy_frame
PARAMS ((void));
286 /* Discard from the stack the innermost frame, restoring all registers. */
288 #define POP_FRAME { i386_pop_frame (); }
291 i386_pop_frame
PARAMS ((void));
294 * call 11223344 (32 bit relative)
298 #define CALL_DUMMY { 0x223344e8, 0xcc11 }
300 #define CALL_DUMMY_LENGTH 8
302 #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */
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) \
309 *(int *)((char *)(dummyname) + 1) = (int)(fun) - (pc) - 5; \