| 1 | /* Host-dependent code for GDB, for NYU Ultra3 running Sym1 OS. |
| 2 | Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc. |
| 3 | Contributed by David Wood (wood@nyu.edu) at New York University. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 20 | |
| 21 | #define DEBUG |
| 22 | #include "defs.h" |
| 23 | #include "frame.h" |
| 24 | #include "inferior.h" |
| 25 | #include "symtab.h" |
| 26 | #include "value.h" |
| 27 | |
| 28 | #include <sys/types.h> |
| 29 | #include <sys/param.h> |
| 30 | #include <signal.h> |
| 31 | #include <sys/ioctl.h> |
| 32 | #include <fcntl.h> |
| 33 | |
| 34 | #include "gdbcore.h" |
| 35 | |
| 36 | #include <sys/file.h> |
| 37 | #include <sys/stat.h> |
| 38 | #include <sys/ptrace.h> |
| 39 | |
| 40 | /* Assumes support for AMD's Binary Compatibility Standard |
| 41 | for ptrace(). If you define ULTRA3, the ultra3 extensions to |
| 42 | ptrace() are used allowing the reading of more than one register |
| 43 | at a time. |
| 44 | |
| 45 | This file assumes KERNEL_DEBUGGING is turned off. This means |
| 46 | that if the user/gdb tries to read gr64-gr95 or any of the |
| 47 | protected special registers we silently return -1 (see the |
| 48 | CANNOT_STORE/FETCH_REGISTER macros). */ |
| 49 | #define ULTRA3 |
| 50 | |
| 51 | #if !defined (offsetof) |
| 52 | # define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) |
| 53 | #endif |
| 54 | |
| 55 | extern int errno; |
| 56 | struct ptrace_user pt_struct; |
| 57 | |
| 58 | /* |
| 59 | * Fetch an individual register (and supply it). |
| 60 | * return 0 on success, -1 on failure. |
| 61 | * NOTE: Assumes AMD's Binary Compatibility Standard for ptrace(). |
| 62 | */ |
| 63 | static void |
| 64 | fetch_register (regno) |
| 65 | int regno; |
| 66 | { |
| 67 | char buf[128]; |
| 68 | int val; |
| 69 | |
| 70 | if (CANNOT_FETCH_REGISTER(regno)) { |
| 71 | val = -1; |
| 72 | supply_register (regno, &val); |
| 73 | } else { |
| 74 | errno = 0; |
| 75 | val = ptrace (PT_READ_U, inferior_pid, |
| 76 | (PTRACE_ARG3_TYPE) register_addr(regno,0), 0); |
| 77 | if (errno != 0) { |
| 78 | sprintf(buf,"reading register %s (#%d)",reg_names[regno],regno); |
| 79 | perror_with_name (buf); |
| 80 | } else { |
| 81 | supply_register (regno, &val); |
| 82 | } |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | /* Get all available registers from the inferior. Registers that are |
| 87 | * defined in REGISTER_NAMES, but not available to the user/gdb are |
| 88 | * supplied as -1. This may include gr64-gr95 and the protected special |
| 89 | * purpose registers. |
| 90 | */ |
| 91 | |
| 92 | void |
| 93 | fetch_inferior_registers (regno) |
| 94 | int regno; |
| 95 | { |
| 96 | register int i,j,ret_val=0; |
| 97 | char buf[128]; |
| 98 | |
| 99 | if (regno != -1) { |
| 100 | fetch_register (regno); |
| 101 | return; |
| 102 | } |
| 103 | |
| 104 | /* Global Registers */ |
| 105 | #ifdef ULTRA3 |
| 106 | errno = 0; |
| 107 | ptrace (PT_READ_STRUCT, inferior_pid, |
| 108 | (PTRACE_ARG3_TYPE) register_addr(GR96_REGNUM,0), |
| 109 | (int)&pt_struct.pt_gr[0], 32*4); |
| 110 | if (errno != 0) { |
| 111 | perror_with_name ("reading global registers"); |
| 112 | ret_val = -1; |
| 113 | } else for (regno=GR96_REGNUM, j=0 ; j<32 ; regno++, j++) { |
| 114 | supply_register (regno, &pt_struct.pt_gr[j]); |
| 115 | } |
| 116 | #else |
| 117 | for (regno=GR96_REGNUM ; !ret_val && regno < GR96_REGNUM+32 ; regno++) |
| 118 | fetch_register(regno); |
| 119 | #endif |
| 120 | |
| 121 | /* Local Registers */ |
| 122 | #ifdef ULTRA3 |
| 123 | errno = 0; |
| 124 | ptrace (PT_READ_STRUCT, inferior_pid, |
| 125 | (PTRACE_ARG3_TYPE) register_addr(LR0_REGNUM,0), |
| 126 | (int)&pt_struct.pt_lr[0], 128*4); |
| 127 | if (errno != 0) { |
| 128 | perror_with_name ("reading local registers"); |
| 129 | ret_val = -1; |
| 130 | } else for (regno=LR0_REGNUM, j=0 ; j<128 ; regno++, j++) { |
| 131 | supply_register (regno, &pt_struct.pt_lr[j]); |
| 132 | } |
| 133 | #else |
| 134 | for (regno=LR0_REGNUM ; !ret_val && regno < LR0_REGNUM+128 ; regno++) |
| 135 | fetch_register(regno); |
| 136 | #endif |
| 137 | |
| 138 | /* Special Registers */ |
| 139 | fetch_register(GR1_REGNUM); |
| 140 | fetch_register(CPS_REGNUM); |
| 141 | fetch_register(PC_REGNUM); |
| 142 | fetch_register(NPC_REGNUM); |
| 143 | fetch_register(PC2_REGNUM); |
| 144 | fetch_register(IPC_REGNUM); |
| 145 | fetch_register(IPA_REGNUM); |
| 146 | fetch_register(IPB_REGNUM); |
| 147 | fetch_register(Q_REGNUM); |
| 148 | fetch_register(BP_REGNUM); |
| 149 | fetch_register(FC_REGNUM); |
| 150 | |
| 151 | /* Fake any registers that are in REGISTER_NAMES, but not available to gdb */ |
| 152 | registers_fetched(); |
| 153 | } |
| 154 | |
| 155 | /* Store our register values back into the inferior. |
| 156 | * If REGNO is -1, do this for all registers. |
| 157 | * Otherwise, REGNO specifies which register (so we can save time). |
| 158 | * NOTE: Assumes AMD's binary compatibility standard. |
| 159 | */ |
| 160 | |
| 161 | void |
| 162 | store_inferior_registers (regno) |
| 163 | int regno; |
| 164 | { |
| 165 | register unsigned int regaddr; |
| 166 | char buf[80]; |
| 167 | |
| 168 | if (regno >= 0) |
| 169 | { |
| 170 | if (CANNOT_STORE_REGISTER(regno)) |
| 171 | return; |
| 172 | regaddr = register_addr (regno, 0); |
| 173 | errno = 0; |
| 174 | ptrace (PT_WRITE_U, inferior_pid, |
| 175 | (PTRACE_ARG3_TYPE) regaddr, read_register(regno)); |
| 176 | if (errno != 0) |
| 177 | { |
| 178 | sprintf (buf, "writing register %s (#%d)", reg_names[regno],regno); |
| 179 | perror_with_name (buf); |
| 180 | } |
| 181 | } |
| 182 | else |
| 183 | { |
| 184 | #ifdef ULTRA3 |
| 185 | pt_struct.pt_gr1 = read_register(GR1_REGNUM); |
| 186 | for (regno = GR96_REGNUM; regno < GR96_REGNUM+32; regno++) |
| 187 | pt_struct.pt_gr[regno] = read_register(regno); |
| 188 | for (regno = LR0_REGNUM; regno < LR0_REGNUM+128; regno++) |
| 189 | pt_struct.pt_gr[regno] = read_register(regno); |
| 190 | errno = 0; |
| 191 | ptrace (PT_WRITE_STRUCT, inferior_pid, |
| 192 | (PTRACE_ARG3_TYPE) register_addr(GR1_REGNUM,0), |
| 193 | (int)&pt_struct.pt_gr1,(1*32*128)*4); |
| 194 | if (errno != 0) |
| 195 | { |
| 196 | sprintf (buf, "writing all local/global registers"); |
| 197 | perror_with_name (buf); |
| 198 | } |
| 199 | pt_struct.pt_psr = read_register(CPS_REGNUM); |
| 200 | pt_struct.pt_pc0 = read_register(NPC_REGNUM); |
| 201 | pt_struct.pt_pc1 = read_register(PC_REGNUM); |
| 202 | pt_struct.pt_pc2 = read_register(PC2_REGNUM); |
| 203 | pt_struct.pt_ipc = read_register(IPC_REGNUM); |
| 204 | pt_struct.pt_ipa = read_register(IPA_REGNUM); |
| 205 | pt_struct.pt_ipb = read_register(IPB_REGNUM); |
| 206 | pt_struct.pt_q = read_register(Q_REGNUM); |
| 207 | pt_struct.pt_bp = read_register(BP_REGNUM); |
| 208 | pt_struct.pt_fc = read_register(FC_REGNUM); |
| 209 | errno = 0; |
| 210 | ptrace (PT_WRITE_STRUCT, inferior_pid, |
| 211 | (PTRACE_ARG3_TYPE) register_addr(CPS_REGNUM,0), |
| 212 | (int)&pt_struct.pt_psr,(10)*4); |
| 213 | if (errno != 0) |
| 214 | { |
| 215 | sprintf (buf, "writing all special registers"); |
| 216 | perror_with_name (buf); |
| 217 | return; |
| 218 | } |
| 219 | #else |
| 220 | store_inferior_registers(GR1_REGNUM); |
| 221 | for (regno=GR96_REGNUM ; regno<GR96_REGNUM+32 ; regno++) |
| 222 | store_inferior_registers(regno); |
| 223 | for (regno=LR0_REGNUM ; regno<LR0_REGNUM+128 ; regno++) |
| 224 | store_inferior_registers(regno); |
| 225 | store_inferior_registers(CPS_REGNUM); |
| 226 | store_inferior_registers(PC_REGNUM); |
| 227 | store_inferior_registers(NPC_REGNUM); |
| 228 | store_inferior_registers(PC2_REGNUM); |
| 229 | store_inferior_registers(IPC_REGNUM); |
| 230 | store_inferior_registers(IPA_REGNUM); |
| 231 | store_inferior_registers(IPB_REGNUM); |
| 232 | store_inferior_registers(Q_REGNUM); |
| 233 | store_inferior_registers(BP_REGNUM); |
| 234 | store_inferior_registers(FC_REGNUM); |
| 235 | #endif /* ULTRA3 */ |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | /* |
| 240 | * Read AMD's Binary Compatibilty Standard conforming core file. |
| 241 | * struct ptrace_user is the first thing in the core file |
| 242 | */ |
| 243 | |
| 244 | void |
| 245 | fetch_core_registers () |
| 246 | { |
| 247 | register int regno; |
| 248 | int val; |
| 249 | char buf[4]; |
| 250 | |
| 251 | for (regno = 0 ; regno < NUM_REGS; regno++) { |
| 252 | if (!CANNOT_FETCH_REGISTER(regno)) { |
| 253 | val = bfd_seek (core_bfd, register_addr (regno, 0), 0); |
| 254 | if (val < 0 || (val = bfd_read (buf, sizeof buf, 1, core_bfd)) < 0) { |
| 255 | char * buffer = (char *) alloca (strlen (reg_names[regno]) + 35); |
| 256 | strcpy (buffer, "Reading core register "); |
| 257 | strcat (buffer, reg_names[regno]); |
| 258 | perror_with_name (buffer); |
| 259 | } |
| 260 | supply_register (regno, buf); |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | /* Fake any registers that are in REGISTER_NAMES, but not available to gdb */ |
| 265 | registers_fetched(); |
| 266 | } |
| 267 | |
| 268 | |
| 269 | /* |
| 270 | * Takes a register number as defined in tm.h via REGISTER_NAMES, and maps |
| 271 | * it to an offset in a struct ptrace_user defined by AMD's BCS. |
| 272 | * That is, it defines the mapping between gdb register numbers and items in |
| 273 | * a struct ptrace_user. |
| 274 | * A register protection scheme is set up here. If a register not |
| 275 | * available to the user is specified in 'regno', then an address that |
| 276 | * will cause ptrace() to fail is returned. |
| 277 | */ |
| 278 | unsigned int |
| 279 | register_addr (regno,blockend) |
| 280 | unsigned int regno; |
| 281 | char *blockend; |
| 282 | { |
| 283 | if ((regno >= LR0_REGNUM) && (regno < LR0_REGNUM + 128)) { |
| 284 | return(offsetof(struct ptrace_user,pt_lr[regno-LR0_REGNUM])); |
| 285 | } else if ((regno >= GR96_REGNUM) && (regno < GR96_REGNUM + 32)) { |
| 286 | return(offsetof(struct ptrace_user,pt_gr[regno-GR96_REGNUM])); |
| 287 | } else { |
| 288 | switch (regno) { |
| 289 | case GR1_REGNUM: return(offsetof(struct ptrace_user,pt_gr1)); |
| 290 | case CPS_REGNUM: return(offsetof(struct ptrace_user,pt_psr)); |
| 291 | case NPC_REGNUM: return(offsetof(struct ptrace_user,pt_pc0)); |
| 292 | case PC_REGNUM: return(offsetof(struct ptrace_user,pt_pc1)); |
| 293 | case PC2_REGNUM: return(offsetof(struct ptrace_user,pt_pc2)); |
| 294 | case IPC_REGNUM: return(offsetof(struct ptrace_user,pt_ipc)); |
| 295 | case IPA_REGNUM: return(offsetof(struct ptrace_user,pt_ipa)); |
| 296 | case IPB_REGNUM: return(offsetof(struct ptrace_user,pt_ipb)); |
| 297 | case Q_REGNUM: return(offsetof(struct ptrace_user,pt_q)); |
| 298 | case BP_REGNUM: return(offsetof(struct ptrace_user,pt_bp)); |
| 299 | case FC_REGNUM: return(offsetof(struct ptrace_user,pt_fc)); |
| 300 | default: |
| 301 | fprintf_filtered(stderr,"register_addr():Bad register %s (%d)\n", |
| 302 | reg_names[regno],regno); |
| 303 | return(0xffffffff); /* Should make ptrace() fail */ |
| 304 | } |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | |
| 309 | /* Assorted operating system circumventions */ |
| 310 | |
| 311 | #ifdef SYM1 |
| 312 | |
| 313 | /* FIXME: Kludge this for now. It really should be system call. */ |
| 314 | int |
| 315 | getpagesize() |
| 316 | { return(8192); } |
| 317 | |
| 318 | /* FIXME: Fake out the fcntl() call, which we don't have. */ |
| 319 | fcntl(fd, cmd, arg) |
| 320 | int fd, cmd, arg; |
| 321 | { |
| 322 | |
| 323 | switch (cmd) { |
| 324 | case F_GETFL: return(O_RDONLY); break; |
| 325 | default: |
| 326 | printf("Ultra3's fcntl() failing, cmd = %d.\n",cmd); |
| 327 | return(-1); |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | |
| 332 | /* |
| 333 | * 4.2 Signal support, requires linking with libjobs. |
| 334 | */ |
| 335 | static int _SigMask; |
| 336 | #define sigbit(s) (1L << ((s)-1)) |
| 337 | |
| 338 | init_SigMask() |
| 339 | { |
| 340 | /* Taken from the sym1 kernel in machdep.c:startup() */ |
| 341 | _SigMask = sigbit (SIGTSTP) | sigbit (SIGTTOU) | sigbit (SIGTTIN) | |
| 342 | sigbit (SIGCHLD) | sigbit (SIGTINT); |
| 343 | } |
| 344 | |
| 345 | sigmask(signo) |
| 346 | int signo; |
| 347 | { |
| 348 | return (1 << (signo-1)); |
| 349 | } |
| 350 | |
| 351 | sigsetmask(sigmask) |
| 352 | unsigned int sigmask; |
| 353 | { |
| 354 | int i, mask = 1; |
| 355 | int lastmask = _SigMask; |
| 356 | |
| 357 | for (i=0 ; i<NSIG ; i++) { |
| 358 | if (sigmask & mask) { |
| 359 | if (!(_SigMask & mask)) { |
| 360 | sighold(i+1); |
| 361 | _SigMask |= mask; |
| 362 | } |
| 363 | } else if (_SigMask & mask) { |
| 364 | sigrelse(i+1); |
| 365 | _SigMask &= ~mask; |
| 366 | } |
| 367 | mask <<= 1; |
| 368 | } |
| 369 | return (lastmask); |
| 370 | } |
| 371 | |
| 372 | sigblock(sigmask) |
| 373 | unsigned int sigmask; |
| 374 | { |
| 375 | int i, mask = 1; |
| 376 | int lastmask = _SigMask; |
| 377 | |
| 378 | for (i=0 ; i<NSIG ; i++) { |
| 379 | if ((sigmask & mask) && !(_SigMask & mask)) { |
| 380 | sighold(i+1); |
| 381 | _SigMask |= mask; |
| 382 | } |
| 383 | mask <<= 1; |
| 384 | } |
| 385 | return (lastmask); |
| 386 | } |
| 387 | #endif /* SYM1 */ |
| 388 | |
| 389 | |
| 390 | /* Initialization code for this module. */ |
| 391 | |
| 392 | _initialize_ultra3 () |
| 393 | { |
| 394 | #ifdef SYM1 |
| 395 | init_SigMask(); |
| 396 | #endif |
| 397 | } |