| 1 | /* Parameters for a Sun 386i target machine, for GDB, the GNU debugger. |
| 2 | Copyright 1986, 1987, 1991, 1992 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 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. |
| 10 | |
| 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. |
| 15 | |
| 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. */ |
| 19 | |
| 20 | #define TARGET_BYTE_ORDER LITTLE_ENDIAN |
| 21 | |
| 22 | #ifndef sun386 |
| 23 | #define sun386 |
| 24 | #endif |
| 25 | #define GDB_TARGET_IS_SUN386 1 |
| 26 | #define SUNOS4 |
| 27 | #define USE_MACHINE_REG_H |
| 28 | |
| 29 | /* Perhaps some day this will work even without the following #define */ |
| 30 | #define COFF_ENCAPSULATE |
| 31 | |
| 32 | #ifdef COFF_ENCAPSULATE |
| 33 | #define NAMES_HAVE_UNDERSCORE |
| 34 | /* Avoid conflicts between our include files and <sys/exec.h> |
| 35 | (maybe not needed anymore). */ |
| 36 | #define _EXEC_ |
| 37 | #endif |
| 38 | |
| 39 | /* sun386 ptrace seems unable to change the frame pointer */ |
| 40 | #define PTRACE_FP_BUG |
| 41 | |
| 42 | /* Offset from address of function to start of its code. |
| 43 | Zero on most machines. */ |
| 44 | |
| 45 | #define FUNCTION_START_OFFSET 0 |
| 46 | |
| 47 | /* Advance PC across any function entry prologue instructions |
| 48 | to reach some "real" code. */ |
| 49 | |
| 50 | #define SKIP_PROLOGUE(frompc) {(frompc) = i386_skip_prologue((frompc));} |
| 51 | |
| 52 | extern int |
| 53 | i386_skip_prologue PARAMS ((int)); |
| 54 | |
| 55 | /* Immediately after a function call, return the saved pc. |
| 56 | Can't always go through the frames for this because on some machines |
| 57 | the new frame is not set up until the new function executes |
| 58 | some instructions. */ |
| 59 | |
| 60 | #define SAVED_PC_AFTER_CALL(frame) \ |
| 61 | (read_memory_integer (read_register (SP_REGNUM), 4)) |
| 62 | |
| 63 | /* Address of end of stack space. */ |
| 64 | |
| 65 | #define STACK_END_ADDR 0xfc000000 |
| 66 | |
| 67 | /* Stack grows downward. */ |
| 68 | |
| 69 | #define INNER_THAN < |
| 70 | |
| 71 | /* Sequence of bytes for breakpoint instruction. */ |
| 72 | |
| 73 | #define BREAKPOINT {0xcc} |
| 74 | |
| 75 | /* Amount PC must be decremented by after a breakpoint. |
| 76 | This is often the number of bytes in BREAKPOINT |
| 77 | but not always. */ |
| 78 | |
| 79 | #define DECR_PC_AFTER_BREAK 1 |
| 80 | |
| 81 | /* Nonzero if instruction at PC is a return instruction. */ |
| 82 | |
| 83 | #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc3) |
| 84 | |
| 85 | /* Return 1 if P points to an invalid floating point value. |
| 86 | LEN is the length in bytes -- not relevant on the 386. */ |
| 87 | |
| 88 | #define INVALID_FLOAT(p, len) (0) |
| 89 | |
| 90 | /* Largest integer type */ |
| 91 | #define LONGEST long |
| 92 | |
| 93 | /* Name of the builtin type for the LONGEST type above. */ |
| 94 | #define BUILTIN_TYPE_LONGEST builtin_type_long |
| 95 | |
| 96 | /* Say how long (ordinary) registers are. */ |
| 97 | |
| 98 | #define REGISTER_TYPE long |
| 99 | |
| 100 | /* Number of machine registers */ |
| 101 | |
| 102 | #define NUM_REGS 35 |
| 103 | |
| 104 | /* Initializer for an array of names of registers. |
| 105 | There should be NUM_REGS strings in this initializer. */ |
| 106 | |
| 107 | /* the order of the first 8 registers must match the compiler's |
| 108 | * numbering scheme (which is the same as the 386 scheme) |
| 109 | * also, this table must match regmap in i386-pinsn.c. |
| 110 | */ |
| 111 | #define REGISTER_NAMES { "gs", "fs", "es", "ds", \ |
| 112 | "edi", "esi", "ebp", "esp", \ |
| 113 | "ebx", "edx", "ecx", "eax", \ |
| 114 | "retaddr", "trapnum", "errcode", "ip", \ |
| 115 | "cs", "ps", "sp", "ss", \ |
| 116 | "fst0", "fst1", "fst2", "fst3", \ |
| 117 | "fst4", "fst5", "fst6", "fst7", \ |
| 118 | "fctrl", "fstat", "ftag", "fip", \ |
| 119 | "fcs", "fopoff", "fopsel" \ |
| 120 | } |
| 121 | |
| 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. */ |
| 128 | |
| 129 | #define FP_REGNUM 6 /* Contains address of executing stack frame */ |
| 130 | #define SP_REGNUM 18 /* Contains address of top of stack */ |
| 131 | #define PS_REGNUM 17 /* Contains processor status */ |
| 132 | #define PC_REGNUM 15 /* Contains program counter */ |
| 133 | #define FP0_REGNUM 20 /* Floating point register 0 */ |
| 134 | #define FPC_REGNUM 28 /* 80387 control register */ |
| 135 | |
| 136 | /* Total amount of space needed to store our copies of the machine's |
| 137 | register state, the array `registers'. */ |
| 138 | #define REGISTER_BYTES (20*4+8*10+7*4) |
| 139 | |
| 140 | /* Index within `registers' of the first byte of the space for |
| 141 | register N. */ |
| 142 | |
| 143 | #define REGISTER_BYTE(N) \ |
| 144 | ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 160 \ |
| 145 | : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 10) + 80 \ |
| 146 | : (N) * 4) |
| 147 | |
| 148 | /* Number of bytes of storage in the actual machine representation |
| 149 | for register N. */ |
| 150 | |
| 151 | #define REGISTER_RAW_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 10 : 4) |
| 152 | |
| 153 | /* Number of bytes of storage in the program's representation |
| 154 | for register N. */ |
| 155 | |
| 156 | #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 8 : 4) |
| 157 | |
| 158 | /* Largest value REGISTER_RAW_SIZE can have. */ |
| 159 | |
| 160 | #define MAX_REGISTER_RAW_SIZE 10 |
| 161 | |
| 162 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ |
| 163 | |
| 164 | #define MAX_REGISTER_VIRTUAL_SIZE 8 |
| 165 | |
| 166 | /* Nonzero if register N requires conversion |
| 167 | from raw format to virtual format. */ |
| 168 | |
| 169 | #define REGISTER_CONVERTIBLE(N) (((unsigned)((N) - FP0_REGNUM)) < 8) |
| 170 | |
| 171 | /* Convert data from raw format for register REGNUM |
| 172 | to virtual format for register REGNUM. */ |
| 173 | |
| 174 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ |
| 175 | { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \ |
| 176 | i387_to_double ((FROM), (TO)); \ |
| 177 | else \ |
| 178 | bcopy ((FROM), (TO), 4); } |
| 179 | |
| 180 | extern void |
| 181 | i387_to_double PARAMS ((char *, char *)); |
| 182 | |
| 183 | /* Convert data from virtual format for register REGNUM |
| 184 | to raw format for register REGNUM. */ |
| 185 | |
| 186 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ |
| 187 | { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \ |
| 188 | double_to_i387 ((FROM), (TO)); \ |
| 189 | else \ |
| 190 | bcopy ((FROM), (TO), 4); } |
| 191 | |
| 192 | extern void |
| 193 | double_to_i387 PARAMS ((char *, char *)); |
| 194 | |
| 195 | /* Return the GDB type object for the "standard" data type |
| 196 | of data in register N. */ |
| 197 | |
| 198 | #define REGISTER_VIRTUAL_TYPE(N) \ |
| 199 | (((unsigned)((N) - FP0_REGNUM)) < 8 ? builtin_type_double : builtin_type_int) |
| 200 | |
| 201 | /* Store the address of the place in which to copy the structure the |
| 202 | subroutine will return. This is called from call_function. */ |
| 203 | |
| 204 | #define STORE_STRUCT_RETURN(ADDR, SP) \ |
| 205 | { (SP) -= sizeof (ADDR); \ |
| 206 | write_memory ((SP), &(ADDR), sizeof (ADDR)); } |
| 207 | |
| 208 | /* Extract from an array REGBUF containing the (raw) register state |
| 209 | a function return value of type TYPE, and copy that, in virtual format, |
| 210 | into VALBUF. */ |
| 211 | |
| 212 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ |
| 213 | bcopy (REGBUF + REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE)) |
| 214 | |
| 215 | /* Write into appropriate registers a function return value |
| 216 | of type TYPE, given in virtual format. */ |
| 217 | |
| 218 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
| 219 | write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE)) |
| 220 | |
| 221 | /* Extract from an array REGBUF containing the (raw) register state |
| 222 | the address in which a function should return its structure value, |
| 223 | as a CORE_ADDR (or an expression that can be used as one). */ |
| 224 | |
| 225 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF)) |
| 226 | \f |
| 227 | /* Describe the pointer in each stack frame to the previous stack frame |
| 228 | (its caller). */ |
| 229 | |
| 230 | /* FRAME_CHAIN takes a frame's nominal address |
| 231 | and produces the frame's chain-pointer. */ |
| 232 | |
| 233 | #define FRAME_CHAIN(thisframe) \ |
| 234 | (!inside_entry_file ((thisframe)->pc) ? \ |
| 235 | read_memory_integer ((thisframe)->frame, 4) :\ |
| 236 | 0) |
| 237 | |
| 238 | /* Define other aspects of the stack frame. */ |
| 239 | |
| 240 | /* A macro that tells us whether the function invocation represented |
| 241 | by FI does not have a frame on the stack associated with it. If it |
| 242 | does not, FRAMELESS is set to 1, else 0. */ |
| 243 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ |
| 244 | { (FRAMELESS) = frameless_look_for_prologue (FI); } |
| 245 | |
| 246 | #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4)) |
| 247 | |
| 248 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) |
| 249 | |
| 250 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) |
| 251 | |
| 252 | /* Return number of args passed to a frame. |
| 253 | Can return -1, meaning no way to tell. */ |
| 254 | |
| 255 | #define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi) |
| 256 | |
| 257 | #ifdef __STDC__ /* Forward decl's for prototypes */ |
| 258 | struct frame_info; |
| 259 | struct frame_saved_regs; |
| 260 | #endif |
| 261 | |
| 262 | extern int |
| 263 | i386_frame_num_args PARAMS ((struct frame_info *)); |
| 264 | |
| 265 | /* Return number of bytes at start of arglist that are not really args. */ |
| 266 | |
| 267 | #define FRAME_ARGS_SKIP 8 |
| 268 | |
| 269 | /* Put here the code to store, into a struct frame_saved_regs, |
| 270 | the addresses of the saved registers of frame described by FRAME_INFO. |
| 271 | This includes special registers such as pc and fp saved in special |
| 272 | ways in the stack frame. sp is even more special: |
| 273 | the address we return for it IS the sp for the next frame. */ |
| 274 | |
| 275 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ |
| 276 | { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); } |
| 277 | |
| 278 | extern void |
| 279 | i386_frame_find_saved_regs PARAMS ((struct frame_info *, |
| 280 | struct frame_saved_regs *)); |
| 281 | |
| 282 | \f |
| 283 | /* Things needed for making the inferior call functions. */ |
| 284 | |
| 285 | /* Push an empty stack frame, to record the current PC, etc. */ |
| 286 | |
| 287 | #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); } |
| 288 | |
| 289 | extern void |
| 290 | i386_push_dummy_frame PARAMS ((void)); |
| 291 | |
| 292 | /* Discard from the stack the innermost frame, restoring all registers. */ |
| 293 | |
| 294 | #define POP_FRAME { i386_pop_frame (); } |
| 295 | |
| 296 | extern void |
| 297 | i386_pop_frame PARAMS ((void)); |
| 298 | |
| 299 | /* this is |
| 300 | * call 11223344 (32 bit relative) |
| 301 | * int3 |
| 302 | */ |
| 303 | |
| 304 | #define CALL_DUMMY { 0x223344e8, 0xcc11 } |
| 305 | |
| 306 | #define CALL_DUMMY_LENGTH 8 |
| 307 | |
| 308 | #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */ |
| 309 | |
| 310 | /* Insert the specified number of args and function address |
| 311 | into a call sequence of the above form stored at DUMMYNAME. */ |
| 312 | |
| 313 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ |
| 314 | { \ |
| 315 | *(int *)((char *)(dummyname) + 1) = (int)(fun) - (pc) - 5; \ |
| 316 | } |