| 1 | /* Native debugging support for Intel x86 running DJGPP. |
| 2 | Copyright (C) 1997-2013 Free Software Foundation, Inc. |
| 3 | Written by Robert Hoehne. |
| 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | /* To whomever it may concern, here's a general description of how |
| 21 | debugging in DJGPP works, and the special quirks GDB does to |
| 22 | support that. |
| 23 | |
| 24 | When the DJGPP port of GDB is debugging a DJGPP program natively, |
| 25 | there aren't 2 separate processes, the debuggee and GDB itself, as |
| 26 | on other systems. (This is DOS, where there can only be one active |
| 27 | process at any given time, remember?) Instead, GDB and the |
| 28 | debuggee live in the same process. So when GDB calls |
| 29 | go32_create_inferior below, and that function calls edi_init from |
| 30 | the DJGPP debug support library libdbg.a, we load the debuggee's |
| 31 | executable file into GDB's address space, set it up for execution |
| 32 | as the stub loader (a short real-mode program prepended to each |
| 33 | DJGPP executable) normally would, and do a lot of preparations for |
| 34 | swapping between GDB's and debuggee's internal state, primarily wrt |
| 35 | the exception handlers. This swapping happens every time we resume |
| 36 | the debuggee or switch back to GDB's code, and it includes: |
| 37 | |
| 38 | . swapping all the segment registers |
| 39 | . swapping the PSP (the Program Segment Prefix) |
| 40 | . swapping the signal handlers |
| 41 | . swapping the exception handlers |
| 42 | . swapping the FPU status |
| 43 | . swapping the 3 standard file handles (more about this below) |
| 44 | |
| 45 | Then running the debuggee simply means longjmp into it where its PC |
| 46 | is and let it run until it stops for some reason. When it stops, |
| 47 | GDB catches the exception that stopped it and longjmp's back into |
| 48 | its own code. All the possible exit points of the debuggee are |
| 49 | watched; for example, the normal exit point is recognized because a |
| 50 | DOS program issues a special system call to exit. If one of those |
| 51 | exit points is hit, we mourn the inferior and clean up after it. |
| 52 | Cleaning up is very important, even if the process exits normally, |
| 53 | because otherwise we might leave behind traces of previous |
| 54 | execution, and in several cases GDB itself might be left hosed, |
| 55 | because all the exception handlers were not restored. |
| 56 | |
| 57 | Swapping of the standard handles (in redir_to_child and |
| 58 | redir_to_debugger) is needed because, since both GDB and the |
| 59 | debuggee live in the same process, as far as the OS is concerned, |
| 60 | the share the same file table. This means that the standard |
| 61 | handles 0, 1, and 2 point to the same file table entries, and thus |
| 62 | are connected to the same devices. Therefore, if the debugger |
| 63 | redirects its standard output, the standard output of the debuggee |
| 64 | is also automagically redirected to the same file/device! |
| 65 | Similarly, if the debuggee redirects its stdout to a file, you |
| 66 | won't be able to see debugger's output (it will go to the same file |
| 67 | where the debuggee has its output); and if the debuggee closes its |
| 68 | standard input, you will lose the ability to talk to debugger! |
| 69 | |
| 70 | For this reason, every time the debuggee is about to be resumed, we |
| 71 | call redir_to_child, which redirects the standard handles to where |
| 72 | the debuggee expects them to be. When the debuggee stops and GDB |
| 73 | regains control, we call redir_to_debugger, which redirects those 3 |
| 74 | handles back to where GDB expects. |
| 75 | |
| 76 | Note that only the first 3 handles are swapped, so if the debuggee |
| 77 | redirects or closes any other handles, GDB will not notice. In |
| 78 | particular, the exit code of a DJGPP program forcibly closes all |
| 79 | file handles beyond the first 3 ones, so when the debuggee exits, |
| 80 | GDB currently loses its stdaux and stdprn streams. Fortunately, |
| 81 | GDB does not use those as of this writing, and will never need |
| 82 | to. */ |
| 83 | |
| 84 | #include "defs.h" |
| 85 | |
| 86 | #include <fcntl.h> |
| 87 | |
| 88 | #include "i386-nat.h" |
| 89 | #include "inferior.h" |
| 90 | #include "gdbthread.h" |
| 91 | #include "gdb_wait.h" |
| 92 | #include "gdbcore.h" |
| 93 | #include "command.h" |
| 94 | #include "gdbcmd.h" |
| 95 | #include "floatformat.h" |
| 96 | #include "buildsym.h" |
| 97 | #include "i387-tdep.h" |
| 98 | #include "i386-tdep.h" |
| 99 | #include "value.h" |
| 100 | #include "regcache.h" |
| 101 | #include "gdb_string.h" |
| 102 | #include "top.h" |
| 103 | #include "cli/cli-utils.h" |
| 104 | |
| 105 | #include <stdio.h> /* might be required for __DJGPP_MINOR__ */ |
| 106 | #include <stdlib.h> |
| 107 | #include <ctype.h> |
| 108 | #include <errno.h> |
| 109 | #include <unistd.h> |
| 110 | #include <sys/utsname.h> |
| 111 | #include <io.h> |
| 112 | #include <dos.h> |
| 113 | #include <dpmi.h> |
| 114 | #include <go32.h> |
| 115 | #include <sys/farptr.h> |
| 116 | #include <debug/v2load.h> |
| 117 | #include <debug/dbgcom.h> |
| 118 | #if __DJGPP_MINOR__ > 2 |
| 119 | #include <debug/redir.h> |
| 120 | #endif |
| 121 | |
| 122 | #include <langinfo.h> |
| 123 | |
| 124 | #if __DJGPP_MINOR__ < 3 |
| 125 | /* This code will be provided from DJGPP 2.03 on. Until then I code it |
| 126 | here. */ |
| 127 | typedef struct |
| 128 | { |
| 129 | unsigned short sig0; |
| 130 | unsigned short sig1; |
| 131 | unsigned short sig2; |
| 132 | unsigned short sig3; |
| 133 | unsigned short exponent:15; |
| 134 | unsigned short sign:1; |
| 135 | } |
| 136 | NPXREG; |
| 137 | |
| 138 | typedef struct |
| 139 | { |
| 140 | unsigned int control; |
| 141 | unsigned int status; |
| 142 | unsigned int tag; |
| 143 | unsigned int eip; |
| 144 | unsigned int cs; |
| 145 | unsigned int dataptr; |
| 146 | unsigned int datasel; |
| 147 | NPXREG reg[8]; |
| 148 | } |
| 149 | NPX; |
| 150 | |
| 151 | static NPX npx; |
| 152 | |
| 153 | static void save_npx (void); /* Save the FPU of the debugged program. */ |
| 154 | static void load_npx (void); /* Restore the FPU of the debugged program. */ |
| 155 | |
| 156 | /* ------------------------------------------------------------------------- */ |
| 157 | /* Store the contents of the NPX in the global variable `npx'. */ |
| 158 | /* *INDENT-OFF* */ |
| 159 | |
| 160 | static void |
| 161 | save_npx (void) |
| 162 | { |
| 163 | asm ("inb $0xa0, %%al \n\ |
| 164 | testb $0x20, %%al \n\ |
| 165 | jz 1f \n\ |
| 166 | xorb %%al, %%al \n\ |
| 167 | outb %%al, $0xf0 \n\ |
| 168 | movb $0x20, %%al \n\ |
| 169 | outb %%al, $0xa0 \n\ |
| 170 | outb %%al, $0x20 \n\ |
| 171 | 1: \n\ |
| 172 | fnsave %0 \n\ |
| 173 | fwait " |
| 174 | : "=m" (npx) |
| 175 | : /* No input */ |
| 176 | : "%eax"); |
| 177 | } |
| 178 | |
| 179 | /* *INDENT-ON* */ |
| 180 | |
| 181 | |
| 182 | /* ------------------------------------------------------------------------- */ |
| 183 | /* Reload the contents of the NPX from the global variable `npx'. */ |
| 184 | |
| 185 | static void |
| 186 | load_npx (void) |
| 187 | { |
| 188 | asm ("frstor %0":"=m" (npx)); |
| 189 | } |
| 190 | /* ------------------------------------------------------------------------- */ |
| 191 | /* Stubs for the missing redirection functions. */ |
| 192 | typedef struct { |
| 193 | char *command; |
| 194 | int redirected; |
| 195 | } cmdline_t; |
| 196 | |
| 197 | void |
| 198 | redir_cmdline_delete (cmdline_t *ptr) |
| 199 | { |
| 200 | ptr->redirected = 0; |
| 201 | } |
| 202 | |
| 203 | int |
| 204 | redir_cmdline_parse (const char *args, cmdline_t *ptr) |
| 205 | { |
| 206 | return -1; |
| 207 | } |
| 208 | |
| 209 | int |
| 210 | redir_to_child (cmdline_t *ptr) |
| 211 | { |
| 212 | return 1; |
| 213 | } |
| 214 | |
| 215 | int |
| 216 | redir_to_debugger (cmdline_t *ptr) |
| 217 | { |
| 218 | return 1; |
| 219 | } |
| 220 | |
| 221 | int |
| 222 | redir_debug_init (cmdline_t *ptr) |
| 223 | { |
| 224 | return 0; |
| 225 | } |
| 226 | #endif /* __DJGPP_MINOR < 3 */ |
| 227 | |
| 228 | typedef enum { wp_insert, wp_remove, wp_count } wp_op; |
| 229 | |
| 230 | /* This holds the current reference counts for each debug register. */ |
| 231 | static int dr_ref_count[4]; |
| 232 | |
| 233 | #define SOME_PID 42 |
| 234 | |
| 235 | static int prog_has_started = 0; |
| 236 | static void go32_open (char *name, int from_tty); |
| 237 | static void go32_close (void); |
| 238 | static void go32_attach (struct target_ops *ops, char *args, int from_tty); |
| 239 | static void go32_detach (struct target_ops *ops, char *args, int from_tty); |
| 240 | static void go32_resume (struct target_ops *ops, |
| 241 | ptid_t ptid, int step, |
| 242 | enum gdb_signal siggnal); |
| 243 | static void go32_fetch_registers (struct target_ops *ops, |
| 244 | struct regcache *, int regno); |
| 245 | static void store_register (const struct regcache *, int regno); |
| 246 | static void go32_store_registers (struct target_ops *ops, |
| 247 | struct regcache *, int regno); |
| 248 | static void go32_prepare_to_store (struct regcache *); |
| 249 | static int go32_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, |
| 250 | int write, |
| 251 | struct mem_attrib *attrib, |
| 252 | struct target_ops *target); |
| 253 | static void go32_files_info (struct target_ops *target); |
| 254 | static void go32_kill_inferior (struct target_ops *ops); |
| 255 | static void go32_create_inferior (struct target_ops *ops, char *exec_file, |
| 256 | char *args, char **env, int from_tty); |
| 257 | static void go32_mourn_inferior (struct target_ops *ops); |
| 258 | static int go32_can_run (void); |
| 259 | |
| 260 | static struct target_ops go32_ops; |
| 261 | static void go32_terminal_init (void); |
| 262 | static void go32_terminal_inferior (void); |
| 263 | static void go32_terminal_ours (void); |
| 264 | |
| 265 | #define r_ofs(x) (offsetof(TSS,x)) |
| 266 | |
| 267 | static struct |
| 268 | { |
| 269 | size_t tss_ofs; |
| 270 | size_t size; |
| 271 | } |
| 272 | regno_mapping[] = |
| 273 | { |
| 274 | {r_ofs (tss_eax), 4}, /* normal registers, from a_tss */ |
| 275 | {r_ofs (tss_ecx), 4}, |
| 276 | {r_ofs (tss_edx), 4}, |
| 277 | {r_ofs (tss_ebx), 4}, |
| 278 | {r_ofs (tss_esp), 4}, |
| 279 | {r_ofs (tss_ebp), 4}, |
| 280 | {r_ofs (tss_esi), 4}, |
| 281 | {r_ofs (tss_edi), 4}, |
| 282 | {r_ofs (tss_eip), 4}, |
| 283 | {r_ofs (tss_eflags), 4}, |
| 284 | {r_ofs (tss_cs), 2}, |
| 285 | {r_ofs (tss_ss), 2}, |
| 286 | {r_ofs (tss_ds), 2}, |
| 287 | {r_ofs (tss_es), 2}, |
| 288 | {r_ofs (tss_fs), 2}, |
| 289 | {r_ofs (tss_gs), 2}, |
| 290 | {0, 10}, /* 8 FP registers, from npx.reg[] */ |
| 291 | {1, 10}, |
| 292 | {2, 10}, |
| 293 | {3, 10}, |
| 294 | {4, 10}, |
| 295 | {5, 10}, |
| 296 | {6, 10}, |
| 297 | {7, 10}, |
| 298 | /* The order of the next 7 registers must be consistent |
| 299 | with their numbering in config/i386/tm-i386.h, which see. */ |
| 300 | {0, 2}, /* control word, from npx */ |
| 301 | {4, 2}, /* status word, from npx */ |
| 302 | {8, 2}, /* tag word, from npx */ |
| 303 | {16, 2}, /* last FP exception CS from npx */ |
| 304 | {12, 4}, /* last FP exception EIP from npx */ |
| 305 | {24, 2}, /* last FP exception operand selector from npx */ |
| 306 | {20, 4}, /* last FP exception operand offset from npx */ |
| 307 | {18, 2} /* last FP opcode from npx */ |
| 308 | }; |
| 309 | |
| 310 | static struct |
| 311 | { |
| 312 | int go32_sig; |
| 313 | enum gdb_signal gdb_sig; |
| 314 | } |
| 315 | sig_map[] = |
| 316 | { |
| 317 | {0, GDB_SIGNAL_FPE}, |
| 318 | {1, GDB_SIGNAL_TRAP}, |
| 319 | /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL, |
| 320 | but I think SIGBUS is better, since the NMI is usually activated |
| 321 | as a result of a memory parity check failure. */ |
| 322 | {2, GDB_SIGNAL_BUS}, |
| 323 | {3, GDB_SIGNAL_TRAP}, |
| 324 | {4, GDB_SIGNAL_FPE}, |
| 325 | {5, GDB_SIGNAL_SEGV}, |
| 326 | {6, GDB_SIGNAL_ILL}, |
| 327 | {7, GDB_SIGNAL_EMT}, /* no-coprocessor exception */ |
| 328 | {8, GDB_SIGNAL_SEGV}, |
| 329 | {9, GDB_SIGNAL_SEGV}, |
| 330 | {10, GDB_SIGNAL_BUS}, |
| 331 | {11, GDB_SIGNAL_SEGV}, |
| 332 | {12, GDB_SIGNAL_SEGV}, |
| 333 | {13, GDB_SIGNAL_SEGV}, |
| 334 | {14, GDB_SIGNAL_SEGV}, |
| 335 | {16, GDB_SIGNAL_FPE}, |
| 336 | {17, GDB_SIGNAL_BUS}, |
| 337 | {31, GDB_SIGNAL_ILL}, |
| 338 | {0x1b, GDB_SIGNAL_INT}, |
| 339 | {0x75, GDB_SIGNAL_FPE}, |
| 340 | {0x78, GDB_SIGNAL_ALRM}, |
| 341 | {0x79, GDB_SIGNAL_INT}, |
| 342 | {0x7a, GDB_SIGNAL_QUIT}, |
| 343 | {-1, GDB_SIGNAL_LAST} |
| 344 | }; |
| 345 | |
| 346 | static struct { |
| 347 | enum gdb_signal gdb_sig; |
| 348 | int djgpp_excepno; |
| 349 | } excepn_map[] = { |
| 350 | {GDB_SIGNAL_0, -1}, |
| 351 | {GDB_SIGNAL_ILL, 6}, /* Invalid Opcode */ |
| 352 | {GDB_SIGNAL_EMT, 7}, /* triggers SIGNOFP */ |
| 353 | {GDB_SIGNAL_SEGV, 13}, /* GPF */ |
| 354 | {GDB_SIGNAL_BUS, 17}, /* Alignment Check */ |
| 355 | /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for |
| 356 | details. */ |
| 357 | {GDB_SIGNAL_TERM, 0x1b}, /* triggers Ctrl-Break type of SIGINT */ |
| 358 | {GDB_SIGNAL_FPE, 0x75}, |
| 359 | {GDB_SIGNAL_INT, 0x79}, |
| 360 | {GDB_SIGNAL_QUIT, 0x7a}, |
| 361 | {GDB_SIGNAL_ALRM, 0x78}, /* triggers SIGTIMR */ |
| 362 | {GDB_SIGNAL_PROF, 0x78}, |
| 363 | {GDB_SIGNAL_LAST, -1} |
| 364 | }; |
| 365 | |
| 366 | static void |
| 367 | go32_open (char *name, int from_tty) |
| 368 | { |
| 369 | printf_unfiltered ("Done. Use the \"run\" command to run the program.\n"); |
| 370 | } |
| 371 | |
| 372 | static void |
| 373 | go32_close (void) |
| 374 | { |
| 375 | } |
| 376 | |
| 377 | static void |
| 378 | go32_attach (struct target_ops *ops, char *args, int from_tty) |
| 379 | { |
| 380 | error (_("\ |
| 381 | You cannot attach to a running program on this platform.\n\ |
| 382 | Use the `run' command to run DJGPP programs.")); |
| 383 | } |
| 384 | |
| 385 | static void |
| 386 | go32_detach (struct target_ops *ops, char *args, int from_tty) |
| 387 | { |
| 388 | } |
| 389 | |
| 390 | static int resume_is_step; |
| 391 | static int resume_signal = -1; |
| 392 | |
| 393 | static void |
| 394 | go32_resume (struct target_ops *ops, |
| 395 | ptid_t ptid, int step, enum gdb_signal siggnal) |
| 396 | { |
| 397 | int i; |
| 398 | |
| 399 | resume_is_step = step; |
| 400 | |
| 401 | if (siggnal != GDB_SIGNAL_0 && siggnal != GDB_SIGNAL_TRAP) |
| 402 | { |
| 403 | for (i = 0, resume_signal = -1; |
| 404 | excepn_map[i].gdb_sig != GDB_SIGNAL_LAST; i++) |
| 405 | if (excepn_map[i].gdb_sig == siggnal) |
| 406 | { |
| 407 | resume_signal = excepn_map[i].djgpp_excepno; |
| 408 | break; |
| 409 | } |
| 410 | if (resume_signal == -1) |
| 411 | printf_unfiltered ("Cannot deliver signal %s on this platform.\n", |
| 412 | gdb_signal_to_name (siggnal)); |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | static char child_cwd[FILENAME_MAX]; |
| 417 | |
| 418 | static ptid_t |
| 419 | go32_wait (struct target_ops *ops, |
| 420 | ptid_t ptid, struct target_waitstatus *status, int options) |
| 421 | { |
| 422 | int i; |
| 423 | unsigned char saved_opcode; |
| 424 | unsigned long INT3_addr = 0; |
| 425 | int stepping_over_INT = 0; |
| 426 | |
| 427 | a_tss.tss_eflags &= 0xfeff; /* Reset the single-step flag (TF). */ |
| 428 | if (resume_is_step) |
| 429 | { |
| 430 | /* If the next instruction is INT xx or INTO, we need to handle |
| 431 | them specially. Intel manuals say that these instructions |
| 432 | reset the single-step flag (a.k.a. TF). However, it seems |
| 433 | that, at least in the DPMI environment, and at least when |
| 434 | stepping over the DPMI interrupt 31h, the problem is having |
| 435 | TF set at all when INT 31h is executed: the debuggee either |
| 436 | crashes (and takes the system with it) or is killed by a |
| 437 | SIGTRAP. |
| 438 | |
| 439 | So we need to emulate single-step mode: we put an INT3 opcode |
| 440 | right after the INT xx instruction, let the debuggee run |
| 441 | until it hits INT3 and stops, then restore the original |
| 442 | instruction which we overwrote with the INT3 opcode, and back |
| 443 | up the debuggee's EIP to that instruction. */ |
| 444 | read_child (a_tss.tss_eip, &saved_opcode, 1); |
| 445 | if (saved_opcode == 0xCD || saved_opcode == 0xCE) |
| 446 | { |
| 447 | unsigned char INT3_opcode = 0xCC; |
| 448 | |
| 449 | INT3_addr |
| 450 | = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1; |
| 451 | stepping_over_INT = 1; |
| 452 | read_child (INT3_addr, &saved_opcode, 1); |
| 453 | write_child (INT3_addr, &INT3_opcode, 1); |
| 454 | } |
| 455 | else |
| 456 | a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */ |
| 457 | } |
| 458 | |
| 459 | /* The special value FFFFh in tss_trap indicates to run_child that |
| 460 | tss_irqn holds a signal to be delivered to the debuggee. */ |
| 461 | if (resume_signal <= -1) |
| 462 | { |
| 463 | a_tss.tss_trap = 0; |
| 464 | a_tss.tss_irqn = 0xff; |
| 465 | } |
| 466 | else |
| 467 | { |
| 468 | a_tss.tss_trap = 0xffff; /* run_child looks for this. */ |
| 469 | a_tss.tss_irqn = resume_signal; |
| 470 | } |
| 471 | |
| 472 | /* The child might change working directory behind our back. The |
| 473 | GDB users won't like the side effects of that when they work with |
| 474 | relative file names, and GDB might be confused by its current |
| 475 | directory not being in sync with the truth. So we always make a |
| 476 | point of changing back to where GDB thinks is its cwd, when we |
| 477 | return control to the debugger, but restore child's cwd before we |
| 478 | run it. */ |
| 479 | /* Initialize child_cwd, before the first call to run_child and not |
| 480 | in the initialization, so the child get also the changed directory |
| 481 | set with the gdb-command "cd ..." */ |
| 482 | if (!*child_cwd) |
| 483 | /* Initialize child's cwd with the current one. */ |
| 484 | getcwd (child_cwd, sizeof (child_cwd)); |
| 485 | |
| 486 | chdir (child_cwd); |
| 487 | |
| 488 | #if __DJGPP_MINOR__ < 3 |
| 489 | load_npx (); |
| 490 | #endif |
| 491 | run_child (); |
| 492 | #if __DJGPP_MINOR__ < 3 |
| 493 | save_npx (); |
| 494 | #endif |
| 495 | |
| 496 | /* Did we step over an INT xx instruction? */ |
| 497 | if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1) |
| 498 | { |
| 499 | /* Restore the original opcode. */ |
| 500 | a_tss.tss_eip--; /* EIP points *after* the INT3 instruction. */ |
| 501 | write_child (a_tss.tss_eip, &saved_opcode, 1); |
| 502 | /* Simulate a TRAP exception. */ |
| 503 | a_tss.tss_irqn = 1; |
| 504 | a_tss.tss_eflags |= 0x0100; |
| 505 | } |
| 506 | |
| 507 | getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */ |
| 508 | chdir (current_directory); |
| 509 | |
| 510 | if (a_tss.tss_irqn == 0x21) |
| 511 | { |
| 512 | status->kind = TARGET_WAITKIND_EXITED; |
| 513 | status->value.integer = a_tss.tss_eax & 0xff; |
| 514 | } |
| 515 | else |
| 516 | { |
| 517 | status->value.sig = GDB_SIGNAL_UNKNOWN; |
| 518 | status->kind = TARGET_WAITKIND_STOPPED; |
| 519 | for (i = 0; sig_map[i].go32_sig != -1; i++) |
| 520 | { |
| 521 | if (a_tss.tss_irqn == sig_map[i].go32_sig) |
| 522 | { |
| 523 | #if __DJGPP_MINOR__ < 3 |
| 524 | if ((status->value.sig = sig_map[i].gdb_sig) != |
| 525 | GDB_SIGNAL_TRAP) |
| 526 | status->kind = TARGET_WAITKIND_SIGNALLED; |
| 527 | #else |
| 528 | status->value.sig = sig_map[i].gdb_sig; |
| 529 | #endif |
| 530 | break; |
| 531 | } |
| 532 | } |
| 533 | } |
| 534 | return pid_to_ptid (SOME_PID); |
| 535 | } |
| 536 | |
| 537 | static void |
| 538 | fetch_register (struct regcache *regcache, int regno) |
| 539 | { |
| 540 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 541 | if (regno < gdbarch_fp0_regnum (gdbarch)) |
| 542 | regcache_raw_supply (regcache, regno, |
| 543 | (char *) &a_tss + regno_mapping[regno].tss_ofs); |
| 544 | else if (i386_fp_regnum_p (gdbarch, regno) || i386_fpc_regnum_p (gdbarch, |
| 545 | regno)) |
| 546 | i387_supply_fsave (regcache, regno, &npx); |
| 547 | else |
| 548 | internal_error (__FILE__, __LINE__, |
| 549 | _("Invalid register no. %d in fetch_register."), regno); |
| 550 | } |
| 551 | |
| 552 | static void |
| 553 | go32_fetch_registers (struct target_ops *ops, |
| 554 | struct regcache *regcache, int regno) |
| 555 | { |
| 556 | if (regno >= 0) |
| 557 | fetch_register (regcache, regno); |
| 558 | else |
| 559 | { |
| 560 | for (regno = 0; |
| 561 | regno < gdbarch_fp0_regnum (get_regcache_arch (regcache)); |
| 562 | regno++) |
| 563 | fetch_register (regcache, regno); |
| 564 | i387_supply_fsave (regcache, -1, &npx); |
| 565 | } |
| 566 | } |
| 567 | |
| 568 | static void |
| 569 | store_register (const struct regcache *regcache, int regno) |
| 570 | { |
| 571 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 572 | if (regno < gdbarch_fp0_regnum (gdbarch)) |
| 573 | regcache_raw_collect (regcache, regno, |
| 574 | (char *) &a_tss + regno_mapping[regno].tss_ofs); |
| 575 | else if (i386_fp_regnum_p (gdbarch, regno) || i386_fpc_regnum_p (gdbarch, |
| 576 | regno)) |
| 577 | i387_collect_fsave (regcache, regno, &npx); |
| 578 | else |
| 579 | internal_error (__FILE__, __LINE__, |
| 580 | _("Invalid register no. %d in store_register."), regno); |
| 581 | } |
| 582 | |
| 583 | static void |
| 584 | go32_store_registers (struct target_ops *ops, |
| 585 | struct regcache *regcache, int regno) |
| 586 | { |
| 587 | unsigned r; |
| 588 | |
| 589 | if (regno >= 0) |
| 590 | store_register (regcache, regno); |
| 591 | else |
| 592 | { |
| 593 | for (r = 0; r < gdbarch_fp0_regnum (get_regcache_arch (regcache)); r++) |
| 594 | store_register (regcache, r); |
| 595 | i387_collect_fsave (regcache, -1, &npx); |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | static void |
| 600 | go32_prepare_to_store (struct regcache *regcache) |
| 601 | { |
| 602 | } |
| 603 | |
| 604 | static int |
| 605 | go32_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, int write, |
| 606 | struct mem_attrib *attrib, struct target_ops *target) |
| 607 | { |
| 608 | if (write) |
| 609 | { |
| 610 | if (write_child (memaddr, myaddr, len)) |
| 611 | { |
| 612 | return 0; |
| 613 | } |
| 614 | else |
| 615 | { |
| 616 | return len; |
| 617 | } |
| 618 | } |
| 619 | else |
| 620 | { |
| 621 | if (read_child (memaddr, myaddr, len)) |
| 622 | { |
| 623 | return 0; |
| 624 | } |
| 625 | else |
| 626 | { |
| 627 | return len; |
| 628 | } |
| 629 | } |
| 630 | } |
| 631 | |
| 632 | static cmdline_t child_cmd; /* Parsed child's command line kept here. */ |
| 633 | |
| 634 | static void |
| 635 | go32_files_info (struct target_ops *target) |
| 636 | { |
| 637 | printf_unfiltered ("You are running a DJGPP V2 program.\n"); |
| 638 | } |
| 639 | |
| 640 | static void |
| 641 | go32_kill_inferior (struct target_ops *ops) |
| 642 | { |
| 643 | go32_mourn_inferior (ops); |
| 644 | } |
| 645 | |
| 646 | static void |
| 647 | go32_create_inferior (struct target_ops *ops, char *exec_file, |
| 648 | char *args, char **env, int from_tty) |
| 649 | { |
| 650 | extern char **environ; |
| 651 | jmp_buf start_state; |
| 652 | char *cmdline; |
| 653 | char **env_save = environ; |
| 654 | size_t cmdlen; |
| 655 | struct inferior *inf; |
| 656 | |
| 657 | /* If no exec file handed to us, get it from the exec-file command -- with |
| 658 | a good, common error message if none is specified. */ |
| 659 | if (exec_file == 0) |
| 660 | exec_file = get_exec_file (1); |
| 661 | |
| 662 | resume_signal = -1; |
| 663 | resume_is_step = 0; |
| 664 | |
| 665 | /* Initialize child's cwd as empty to be initialized when starting |
| 666 | the child. */ |
| 667 | *child_cwd = 0; |
| 668 | |
| 669 | /* Init command line storage. */ |
| 670 | if (redir_debug_init (&child_cmd) == -1) |
| 671 | internal_error (__FILE__, __LINE__, |
| 672 | _("Cannot allocate redirection storage: " |
| 673 | "not enough memory.\n")); |
| 674 | |
| 675 | /* Parse the command line and create redirections. */ |
| 676 | if (strpbrk (args, "<>")) |
| 677 | { |
| 678 | if (redir_cmdline_parse (args, &child_cmd) == 0) |
| 679 | args = child_cmd.command; |
| 680 | else |
| 681 | error (_("Syntax error in command line.")); |
| 682 | } |
| 683 | else |
| 684 | child_cmd.command = xstrdup (args); |
| 685 | |
| 686 | cmdlen = strlen (args); |
| 687 | /* v2loadimage passes command lines via DOS memory, so it cannot |
| 688 | possibly handle commands longer than 1MB. */ |
| 689 | if (cmdlen > 1024*1024) |
| 690 | error (_("Command line too long.")); |
| 691 | |
| 692 | cmdline = xmalloc (cmdlen + 4); |
| 693 | strcpy (cmdline + 1, args); |
| 694 | /* If the command-line length fits into DOS 126-char limits, use the |
| 695 | DOS command tail format; otherwise, tell v2loadimage to pass it |
| 696 | through a buffer in conventional memory. */ |
| 697 | if (cmdlen < 127) |
| 698 | { |
| 699 | cmdline[0] = strlen (args); |
| 700 | cmdline[cmdlen + 1] = 13; |
| 701 | } |
| 702 | else |
| 703 | cmdline[0] = 0xff; /* Signal v2loadimage it's a long command. */ |
| 704 | |
| 705 | environ = env; |
| 706 | |
| 707 | if (v2loadimage (exec_file, cmdline, start_state)) |
| 708 | { |
| 709 | environ = env_save; |
| 710 | printf_unfiltered ("Load failed for image %s\n", exec_file); |
| 711 | exit (1); |
| 712 | } |
| 713 | environ = env_save; |
| 714 | xfree (cmdline); |
| 715 | |
| 716 | edi_init (start_state); |
| 717 | #if __DJGPP_MINOR__ < 3 |
| 718 | save_npx (); |
| 719 | #endif |
| 720 | |
| 721 | inferior_ptid = pid_to_ptid (SOME_PID); |
| 722 | inf = current_inferior (); |
| 723 | inferior_appeared (inf, SOME_PID); |
| 724 | |
| 725 | push_target (&go32_ops); |
| 726 | |
| 727 | add_thread_silent (inferior_ptid); |
| 728 | |
| 729 | clear_proceed_status (); |
| 730 | insert_breakpoints (); |
| 731 | prog_has_started = 1; |
| 732 | } |
| 733 | |
| 734 | static void |
| 735 | go32_mourn_inferior (struct target_ops *ops) |
| 736 | { |
| 737 | ptid_t ptid; |
| 738 | |
| 739 | redir_cmdline_delete (&child_cmd); |
| 740 | resume_signal = -1; |
| 741 | resume_is_step = 0; |
| 742 | |
| 743 | cleanup_client (); |
| 744 | |
| 745 | /* We need to make sure all the breakpoint enable bits in the DR7 |
| 746 | register are reset when the inferior exits. Otherwise, if they |
| 747 | rerun the inferior, the uncleared bits may cause random SIGTRAPs, |
| 748 | failure to set more watchpoints, and other calamities. It would |
| 749 | be nice if GDB itself would take care to remove all breakpoints |
| 750 | at all times, but it doesn't, probably under an assumption that |
| 751 | the OS cleans up when the debuggee exits. */ |
| 752 | i386_cleanup_dregs (); |
| 753 | |
| 754 | ptid = inferior_ptid; |
| 755 | inferior_ptid = null_ptid; |
| 756 | delete_thread_silent (ptid); |
| 757 | prog_has_started = 0; |
| 758 | |
| 759 | unpush_target (ops); |
| 760 | generic_mourn_inferior (); |
| 761 | } |
| 762 | |
| 763 | static int |
| 764 | go32_can_run (void) |
| 765 | { |
| 766 | return 1; |
| 767 | } |
| 768 | |
| 769 | /* Hardware watchpoint support. */ |
| 770 | |
| 771 | #define D_REGS edi.dr |
| 772 | #define CONTROL D_REGS[7] |
| 773 | #define STATUS D_REGS[6] |
| 774 | |
| 775 | /* Pass the address ADDR to the inferior in the I'th debug register. |
| 776 | Here we just store the address in D_REGS, the watchpoint will be |
| 777 | actually set up when go32_wait runs the debuggee. */ |
| 778 | static void |
| 779 | go32_set_dr (int i, CORE_ADDR addr) |
| 780 | { |
| 781 | if (i < 0 || i > 3) |
| 782 | internal_error (__FILE__, __LINE__, |
| 783 | _("Invalid register %d in go32_set_dr.\n"), i); |
| 784 | D_REGS[i] = addr; |
| 785 | } |
| 786 | |
| 787 | /* Pass the value VAL to the inferior in the DR7 debug control |
| 788 | register. Here we just store the address in D_REGS, the watchpoint |
| 789 | will be actually set up when go32_wait runs the debuggee. */ |
| 790 | static void |
| 791 | go32_set_dr7 (unsigned long val) |
| 792 | { |
| 793 | CONTROL = val; |
| 794 | } |
| 795 | |
| 796 | /* Get the value of the DR6 debug status register from the inferior. |
| 797 | Here we just return the value stored in D_REGS, as we've got it |
| 798 | from the last go32_wait call. */ |
| 799 | static unsigned long |
| 800 | go32_get_dr6 (void) |
| 801 | { |
| 802 | return STATUS; |
| 803 | } |
| 804 | |
| 805 | /* Get the value of the DR7 debug status register from the inferior. |
| 806 | Here we just return the value stored in D_REGS, as we've got it |
| 807 | from the last go32_wait call. */ |
| 808 | |
| 809 | static unsigned long |
| 810 | go32_get_dr7 (void) |
| 811 | { |
| 812 | return CONTROL; |
| 813 | } |
| 814 | |
| 815 | /* Get the value of the DR debug register I from the inferior. Here |
| 816 | we just return the value stored in D_REGS, as we've got it from the |
| 817 | last go32_wait call. */ |
| 818 | |
| 819 | static CORE_ADDR |
| 820 | go32_get_dr (int i) |
| 821 | { |
| 822 | if (i < 0 || i > 3) |
| 823 | internal_error (__FILE__, __LINE__, |
| 824 | _("Invalid register %d in go32_get_dr.\n"), i); |
| 825 | return D_REGS[i]; |
| 826 | } |
| 827 | |
| 828 | /* Put the device open on handle FD into either raw or cooked |
| 829 | mode, return 1 if it was in raw mode, zero otherwise. */ |
| 830 | |
| 831 | static int |
| 832 | device_mode (int fd, int raw_p) |
| 833 | { |
| 834 | int oldmode, newmode; |
| 835 | __dpmi_regs regs; |
| 836 | |
| 837 | regs.x.ax = 0x4400; |
| 838 | regs.x.bx = fd; |
| 839 | __dpmi_int (0x21, ®s); |
| 840 | if (regs.x.flags & 1) |
| 841 | return -1; |
| 842 | newmode = oldmode = regs.x.dx; |
| 843 | |
| 844 | if (raw_p) |
| 845 | newmode |= 0x20; |
| 846 | else |
| 847 | newmode &= ~0x20; |
| 848 | |
| 849 | if (oldmode & 0x80) /* Only for character dev. */ |
| 850 | { |
| 851 | regs.x.ax = 0x4401; |
| 852 | regs.x.bx = fd; |
| 853 | regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails. */ |
| 854 | __dpmi_int (0x21, ®s); |
| 855 | if (regs.x.flags & 1) |
| 856 | return -1; |
| 857 | } |
| 858 | return (oldmode & 0x20) == 0x20; |
| 859 | } |
| 860 | |
| 861 | |
| 862 | static int inf_mode_valid = 0; |
| 863 | static int inf_terminal_mode; |
| 864 | |
| 865 | /* This semaphore is needed because, amazingly enough, GDB calls |
| 866 | target.to_terminal_ours more than once after the inferior stops. |
| 867 | But we need the information from the first call only, since the |
| 868 | second call will always see GDB's own cooked terminal. */ |
| 869 | static int terminal_is_ours = 1; |
| 870 | |
| 871 | static void |
| 872 | go32_terminal_init (void) |
| 873 | { |
| 874 | inf_mode_valid = 0; /* Reinitialize, in case they are restarting child. */ |
| 875 | terminal_is_ours = 1; |
| 876 | } |
| 877 | |
| 878 | static void |
| 879 | go32_terminal_info (const char *args, int from_tty) |
| 880 | { |
| 881 | printf_unfiltered ("Inferior's terminal is in %s mode.\n", |
| 882 | !inf_mode_valid |
| 883 | ? "default" : inf_terminal_mode ? "raw" : "cooked"); |
| 884 | |
| 885 | #if __DJGPP_MINOR__ > 2 |
| 886 | if (child_cmd.redirection) |
| 887 | { |
| 888 | int i; |
| 889 | |
| 890 | for (i = 0; i < DBG_HANDLES; i++) |
| 891 | { |
| 892 | if (child_cmd.redirection[i]->file_name) |
| 893 | printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n", |
| 894 | i, child_cmd.redirection[i]->file_name); |
| 895 | else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1) |
| 896 | printf_unfiltered |
| 897 | ("\tFile handle %d appears to be closed by inferior.\n", i); |
| 898 | /* Mask off the raw/cooked bit when comparing device info words. */ |
| 899 | else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf) |
| 900 | != (_get_dev_info (i) & 0xdf)) |
| 901 | printf_unfiltered |
| 902 | ("\tFile handle %d appears to be redirected by inferior.\n", i); |
| 903 | } |
| 904 | } |
| 905 | #endif |
| 906 | } |
| 907 | |
| 908 | static void |
| 909 | go32_terminal_inferior (void) |
| 910 | { |
| 911 | /* Redirect standard handles as child wants them. */ |
| 912 | errno = 0; |
| 913 | if (redir_to_child (&child_cmd) == -1) |
| 914 | { |
| 915 | redir_to_debugger (&child_cmd); |
| 916 | error (_("Cannot redirect standard handles for program: %s."), |
| 917 | safe_strerror (errno)); |
| 918 | } |
| 919 | /* Set the console device of the inferior to whatever mode |
| 920 | (raw or cooked) we found it last time. */ |
| 921 | if (terminal_is_ours) |
| 922 | { |
| 923 | if (inf_mode_valid) |
| 924 | device_mode (0, inf_terminal_mode); |
| 925 | terminal_is_ours = 0; |
| 926 | } |
| 927 | } |
| 928 | |
| 929 | static void |
| 930 | go32_terminal_ours (void) |
| 931 | { |
| 932 | /* Switch to cooked mode on the gdb terminal and save the inferior |
| 933 | terminal mode to be restored when it is resumed. */ |
| 934 | if (!terminal_is_ours) |
| 935 | { |
| 936 | inf_terminal_mode = device_mode (0, 0); |
| 937 | if (inf_terminal_mode != -1) |
| 938 | inf_mode_valid = 1; |
| 939 | else |
| 940 | /* If device_mode returned -1, we don't know what happens with |
| 941 | handle 0 anymore, so make the info invalid. */ |
| 942 | inf_mode_valid = 0; |
| 943 | terminal_is_ours = 1; |
| 944 | |
| 945 | /* Restore debugger's standard handles. */ |
| 946 | errno = 0; |
| 947 | if (redir_to_debugger (&child_cmd) == -1) |
| 948 | { |
| 949 | redir_to_child (&child_cmd); |
| 950 | error (_("Cannot redirect standard handles for debugger: %s."), |
| 951 | safe_strerror (errno)); |
| 952 | } |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | static int |
| 957 | go32_thread_alive (struct target_ops *ops, ptid_t ptid) |
| 958 | { |
| 959 | return !ptid_equal (inferior_ptid, null_ptid); |
| 960 | } |
| 961 | |
| 962 | static char * |
| 963 | go32_pid_to_str (struct target_ops *ops, ptid_t ptid) |
| 964 | { |
| 965 | return normal_pid_to_str (ptid); |
| 966 | } |
| 967 | |
| 968 | static void |
| 969 | init_go32_ops (void) |
| 970 | { |
| 971 | go32_ops.to_shortname = "djgpp"; |
| 972 | go32_ops.to_longname = "djgpp target process"; |
| 973 | go32_ops.to_doc = |
| 974 | "Program loaded by djgpp, when gdb is used as an external debugger"; |
| 975 | go32_ops.to_open = go32_open; |
| 976 | go32_ops.to_close = go32_close; |
| 977 | go32_ops.to_attach = go32_attach; |
| 978 | go32_ops.to_detach = go32_detach; |
| 979 | go32_ops.to_resume = go32_resume; |
| 980 | go32_ops.to_wait = go32_wait; |
| 981 | go32_ops.to_fetch_registers = go32_fetch_registers; |
| 982 | go32_ops.to_store_registers = go32_store_registers; |
| 983 | go32_ops.to_prepare_to_store = go32_prepare_to_store; |
| 984 | go32_ops.deprecated_xfer_memory = go32_xfer_memory; |
| 985 | go32_ops.to_files_info = go32_files_info; |
| 986 | go32_ops.to_insert_breakpoint = memory_insert_breakpoint; |
| 987 | go32_ops.to_remove_breakpoint = memory_remove_breakpoint; |
| 988 | go32_ops.to_terminal_init = go32_terminal_init; |
| 989 | go32_ops.to_terminal_inferior = go32_terminal_inferior; |
| 990 | go32_ops.to_terminal_ours_for_output = go32_terminal_ours; |
| 991 | go32_ops.to_terminal_ours = go32_terminal_ours; |
| 992 | go32_ops.to_terminal_info = go32_terminal_info; |
| 993 | go32_ops.to_kill = go32_kill_inferior; |
| 994 | go32_ops.to_create_inferior = go32_create_inferior; |
| 995 | go32_ops.to_mourn_inferior = go32_mourn_inferior; |
| 996 | go32_ops.to_can_run = go32_can_run; |
| 997 | go32_ops.to_thread_alive = go32_thread_alive; |
| 998 | go32_ops.to_pid_to_str = go32_pid_to_str; |
| 999 | go32_ops.to_stratum = process_stratum; |
| 1000 | go32_ops.to_has_all_memory = default_child_has_all_memory; |
| 1001 | go32_ops.to_has_memory = default_child_has_memory; |
| 1002 | go32_ops.to_has_stack = default_child_has_stack; |
| 1003 | go32_ops.to_has_registers = default_child_has_registers; |
| 1004 | go32_ops.to_has_execution = default_child_has_execution; |
| 1005 | |
| 1006 | i386_use_watchpoints (&go32_ops); |
| 1007 | |
| 1008 | |
| 1009 | i386_dr_low.set_control = go32_set_dr7; |
| 1010 | i386_dr_low.set_addr = go32_set_dr; |
| 1011 | i386_dr_low.get_status = go32_get_dr6; |
| 1012 | i386_dr_low.get_control = go32_get_dr7; |
| 1013 | i386_dr_low.get_addr = go32_get_dr; |
| 1014 | i386_set_debug_register_length (4); |
| 1015 | |
| 1016 | go32_ops.to_magic = OPS_MAGIC; |
| 1017 | |
| 1018 | /* Initialize child's cwd as empty to be initialized when starting |
| 1019 | the child. */ |
| 1020 | *child_cwd = 0; |
| 1021 | |
| 1022 | /* Initialize child's command line storage. */ |
| 1023 | if (redir_debug_init (&child_cmd) == -1) |
| 1024 | internal_error (__FILE__, __LINE__, |
| 1025 | _("Cannot allocate redirection storage: " |
| 1026 | "not enough memory.\n")); |
| 1027 | |
| 1028 | /* We are always processing GCC-compiled programs. */ |
| 1029 | processing_gcc_compilation = 2; |
| 1030 | |
| 1031 | /* Override the default name of the GDB init file. */ |
| 1032 | strcpy (gdbinit, "gdb.ini"); |
| 1033 | } |
| 1034 | |
| 1035 | /* Return the current DOS codepage number. */ |
| 1036 | static int |
| 1037 | dos_codepage (void) |
| 1038 | { |
| 1039 | __dpmi_regs regs; |
| 1040 | |
| 1041 | regs.x.ax = 0x6601; |
| 1042 | __dpmi_int (0x21, ®s); |
| 1043 | if (!(regs.x.flags & 1)) |
| 1044 | return regs.x.bx & 0xffff; |
| 1045 | else |
| 1046 | return 437; /* default */ |
| 1047 | } |
| 1048 | |
| 1049 | /* Limited emulation of `nl_langinfo', for charset.c. */ |
| 1050 | char * |
| 1051 | nl_langinfo (nl_item item) |
| 1052 | { |
| 1053 | char *retval; |
| 1054 | |
| 1055 | switch (item) |
| 1056 | { |
| 1057 | case CODESET: |
| 1058 | { |
| 1059 | /* 8 is enough for SHORT_MAX + "CP" + null. */ |
| 1060 | char buf[8]; |
| 1061 | int blen = sizeof (buf); |
| 1062 | int needed = snprintf (buf, blen, "CP%d", dos_codepage ()); |
| 1063 | |
| 1064 | if (needed > blen) /* Should never happen. */ |
| 1065 | buf[0] = 0; |
| 1066 | retval = xstrdup (buf); |
| 1067 | } |
| 1068 | break; |
| 1069 | default: |
| 1070 | retval = xstrdup (""); |
| 1071 | break; |
| 1072 | } |
| 1073 | return retval; |
| 1074 | } |
| 1075 | |
| 1076 | unsigned short windows_major, windows_minor; |
| 1077 | |
| 1078 | /* Compute the version Windows reports via Int 2Fh/AX=1600h. */ |
| 1079 | static void |
| 1080 | go32_get_windows_version(void) |
| 1081 | { |
| 1082 | __dpmi_regs r; |
| 1083 | |
| 1084 | r.x.ax = 0x1600; |
| 1085 | __dpmi_int(0x2f, &r); |
| 1086 | if (r.h.al > 2 && r.h.al != 0x80 && r.h.al != 0xff |
| 1087 | && (r.h.al > 3 || r.h.ah > 0)) |
| 1088 | { |
| 1089 | windows_major = r.h.al; |
| 1090 | windows_minor = r.h.ah; |
| 1091 | } |
| 1092 | else |
| 1093 | windows_major = 0xff; /* meaning no Windows */ |
| 1094 | } |
| 1095 | |
| 1096 | /* A subroutine of go32_sysinfo to display memory info. */ |
| 1097 | static void |
| 1098 | print_mem (unsigned long datum, const char *header, int in_pages_p) |
| 1099 | { |
| 1100 | if (datum != 0xffffffffUL) |
| 1101 | { |
| 1102 | if (in_pages_p) |
| 1103 | datum <<= 12; |
| 1104 | puts_filtered (header); |
| 1105 | if (datum > 1024) |
| 1106 | { |
| 1107 | printf_filtered ("%lu KB", datum >> 10); |
| 1108 | if (datum > 1024 * 1024) |
| 1109 | printf_filtered (" (%lu MB)", datum >> 20); |
| 1110 | } |
| 1111 | else |
| 1112 | printf_filtered ("%lu Bytes", datum); |
| 1113 | puts_filtered ("\n"); |
| 1114 | } |
| 1115 | } |
| 1116 | |
| 1117 | /* Display assorted information about the underlying OS. */ |
| 1118 | static void |
| 1119 | go32_sysinfo (char *arg, int from_tty) |
| 1120 | { |
| 1121 | static const char test_pattern[] = |
| 1122 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf" |
| 1123 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf" |
| 1124 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeafdeadbeaf"; |
| 1125 | struct utsname u; |
| 1126 | char cpuid_vendor[13]; |
| 1127 | unsigned cpuid_max = 0, cpuid_eax, cpuid_ebx, cpuid_ecx, cpuid_edx; |
| 1128 | unsigned true_dos_version = _get_dos_version (1); |
| 1129 | unsigned advertized_dos_version = ((unsigned int)_osmajor << 8) | _osminor; |
| 1130 | int dpmi_flags; |
| 1131 | char dpmi_vendor_info[129]; |
| 1132 | int dpmi_vendor_available; |
| 1133 | __dpmi_version_ret dpmi_version_data; |
| 1134 | long eflags; |
| 1135 | __dpmi_free_mem_info mem_info; |
| 1136 | __dpmi_regs regs; |
| 1137 | |
| 1138 | cpuid_vendor[0] = '\0'; |
| 1139 | if (uname (&u)) |
| 1140 | strcpy (u.machine, "Unknown x86"); |
| 1141 | else if (u.machine[0] == 'i' && u.machine[1] > 4) |
| 1142 | { |
| 1143 | /* CPUID with EAX = 0 returns the Vendor ID. */ |
| 1144 | __asm__ __volatile__ ("xorl %%ebx, %%ebx;" |
| 1145 | "xorl %%ecx, %%ecx;" |
| 1146 | "xorl %%edx, %%edx;" |
| 1147 | "movl $0, %%eax;" |
| 1148 | "cpuid;" |
| 1149 | "movl %%ebx, %0;" |
| 1150 | "movl %%edx, %1;" |
| 1151 | "movl %%ecx, %2;" |
| 1152 | "movl %%eax, %3;" |
| 1153 | : "=m" (cpuid_vendor[0]), |
| 1154 | "=m" (cpuid_vendor[4]), |
| 1155 | "=m" (cpuid_vendor[8]), |
| 1156 | "=m" (cpuid_max) |
| 1157 | : |
| 1158 | : "%eax", "%ebx", "%ecx", "%edx"); |
| 1159 | cpuid_vendor[12] = '\0'; |
| 1160 | } |
| 1161 | |
| 1162 | printf_filtered ("CPU Type.......................%s", u.machine); |
| 1163 | if (cpuid_vendor[0]) |
| 1164 | printf_filtered (" (%s)", cpuid_vendor); |
| 1165 | puts_filtered ("\n"); |
| 1166 | |
| 1167 | /* CPUID with EAX = 1 returns processor signature and features. */ |
| 1168 | if (cpuid_max >= 1) |
| 1169 | { |
| 1170 | static char *brand_name[] = { |
| 1171 | "", |
| 1172 | " Celeron", |
| 1173 | " III", |
| 1174 | " III Xeon", |
| 1175 | "", "", "", "", |
| 1176 | " 4" |
| 1177 | }; |
| 1178 | char cpu_string[80]; |
| 1179 | char cpu_brand[20]; |
| 1180 | unsigned brand_idx; |
| 1181 | int intel_p = strcmp (cpuid_vendor, "GenuineIntel") == 0; |
| 1182 | int amd_p = strcmp (cpuid_vendor, "AuthenticAMD") == 0; |
| 1183 | unsigned cpu_family, cpu_model; |
| 1184 | |
| 1185 | __asm__ __volatile__ ("movl $1, %%eax;" |
| 1186 | "cpuid;" |
| 1187 | : "=a" (cpuid_eax), |
| 1188 | "=b" (cpuid_ebx), |
| 1189 | "=d" (cpuid_edx) |
| 1190 | : |
| 1191 | : "%ecx"); |
| 1192 | brand_idx = cpuid_ebx & 0xff; |
| 1193 | cpu_family = (cpuid_eax >> 8) & 0xf; |
| 1194 | cpu_model = (cpuid_eax >> 4) & 0xf; |
| 1195 | cpu_brand[0] = '\0'; |
| 1196 | if (intel_p) |
| 1197 | { |
| 1198 | if (brand_idx > 0 |
| 1199 | && brand_idx < sizeof(brand_name)/sizeof(brand_name[0]) |
| 1200 | && *brand_name[brand_idx]) |
| 1201 | strcpy (cpu_brand, brand_name[brand_idx]); |
| 1202 | else if (cpu_family == 5) |
| 1203 | { |
| 1204 | if (((cpuid_eax >> 12) & 3) == 0 && cpu_model == 4) |
| 1205 | strcpy (cpu_brand, " MMX"); |
| 1206 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 1) |
| 1207 | strcpy (cpu_brand, " OverDrive"); |
| 1208 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 2) |
| 1209 | strcpy (cpu_brand, " Dual"); |
| 1210 | } |
| 1211 | else if (cpu_family == 6 && cpu_model < 8) |
| 1212 | { |
| 1213 | switch (cpu_model) |
| 1214 | { |
| 1215 | case 1: |
| 1216 | strcpy (cpu_brand, " Pro"); |
| 1217 | break; |
| 1218 | case 3: |
| 1219 | strcpy (cpu_brand, " II"); |
| 1220 | break; |
| 1221 | case 5: |
| 1222 | strcpy (cpu_brand, " II Xeon"); |
| 1223 | break; |
| 1224 | case 6: |
| 1225 | strcpy (cpu_brand, " Celeron"); |
| 1226 | break; |
| 1227 | case 7: |
| 1228 | strcpy (cpu_brand, " III"); |
| 1229 | break; |
| 1230 | } |
| 1231 | } |
| 1232 | } |
| 1233 | else if (amd_p) |
| 1234 | { |
| 1235 | switch (cpu_family) |
| 1236 | { |
| 1237 | case 4: |
| 1238 | strcpy (cpu_brand, "486/5x86"); |
| 1239 | break; |
| 1240 | case 5: |
| 1241 | switch (cpu_model) |
| 1242 | { |
| 1243 | case 0: |
| 1244 | case 1: |
| 1245 | case 2: |
| 1246 | case 3: |
| 1247 | strcpy (cpu_brand, "-K5"); |
| 1248 | break; |
| 1249 | case 6: |
| 1250 | case 7: |
| 1251 | strcpy (cpu_brand, "-K6"); |
| 1252 | break; |
| 1253 | case 8: |
| 1254 | strcpy (cpu_brand, "-K6-2"); |
| 1255 | break; |
| 1256 | case 9: |
| 1257 | strcpy (cpu_brand, "-K6-III"); |
| 1258 | break; |
| 1259 | } |
| 1260 | break; |
| 1261 | case 6: |
| 1262 | switch (cpu_model) |
| 1263 | { |
| 1264 | case 1: |
| 1265 | case 2: |
| 1266 | case 4: |
| 1267 | strcpy (cpu_brand, " Athlon"); |
| 1268 | break; |
| 1269 | case 3: |
| 1270 | strcpy (cpu_brand, " Duron"); |
| 1271 | break; |
| 1272 | } |
| 1273 | break; |
| 1274 | } |
| 1275 | } |
| 1276 | xsnprintf (cpu_string, sizeof (cpu_string), "%s%s Model %d Stepping %d", |
| 1277 | intel_p ? "Pentium" : (amd_p ? "AMD" : "ix86"), |
| 1278 | cpu_brand, cpu_model, cpuid_eax & 0xf); |
| 1279 | printfi_filtered (31, "%s\n", cpu_string); |
| 1280 | if (((cpuid_edx & (6 | (0x0d << 23))) != 0) |
| 1281 | || ((cpuid_edx & 1) == 0) |
| 1282 | || (amd_p && (cpuid_edx & (3 << 30)) != 0)) |
| 1283 | { |
| 1284 | puts_filtered ("CPU Features..................."); |
| 1285 | /* We only list features which might be useful in the DPMI |
| 1286 | environment. */ |
| 1287 | if ((cpuid_edx & 1) == 0) |
| 1288 | puts_filtered ("No FPU "); /* It's unusual to not have an FPU. */ |
| 1289 | if ((cpuid_edx & (1 << 1)) != 0) |
| 1290 | puts_filtered ("VME "); |
| 1291 | if ((cpuid_edx & (1 << 2)) != 0) |
| 1292 | puts_filtered ("DE "); |
| 1293 | if ((cpuid_edx & (1 << 4)) != 0) |
| 1294 | puts_filtered ("TSC "); |
| 1295 | if ((cpuid_edx & (1 << 23)) != 0) |
| 1296 | puts_filtered ("MMX "); |
| 1297 | if ((cpuid_edx & (1 << 25)) != 0) |
| 1298 | puts_filtered ("SSE "); |
| 1299 | if ((cpuid_edx & (1 << 26)) != 0) |
| 1300 | puts_filtered ("SSE2 "); |
| 1301 | if (amd_p) |
| 1302 | { |
| 1303 | if ((cpuid_edx & (1 << 31)) != 0) |
| 1304 | puts_filtered ("3DNow! "); |
| 1305 | if ((cpuid_edx & (1 << 30)) != 0) |
| 1306 | puts_filtered ("3DNow!Ext"); |
| 1307 | } |
| 1308 | puts_filtered ("\n"); |
| 1309 | } |
| 1310 | } |
| 1311 | puts_filtered ("\n"); |
| 1312 | printf_filtered ("DOS Version....................%s %s.%s", |
| 1313 | _os_flavor, u.release, u.version); |
| 1314 | if (true_dos_version != advertized_dos_version) |
| 1315 | printf_filtered (" (disguised as v%d.%d)", _osmajor, _osminor); |
| 1316 | puts_filtered ("\n"); |
| 1317 | if (!windows_major) |
| 1318 | go32_get_windows_version (); |
| 1319 | if (windows_major != 0xff) |
| 1320 | { |
| 1321 | const char *windows_flavor; |
| 1322 | |
| 1323 | printf_filtered ("Windows Version................%d.%02d (Windows ", |
| 1324 | windows_major, windows_minor); |
| 1325 | switch (windows_major) |
| 1326 | { |
| 1327 | case 3: |
| 1328 | windows_flavor = "3.X"; |
| 1329 | break; |
| 1330 | case 4: |
| 1331 | switch (windows_minor) |
| 1332 | { |
| 1333 | case 0: |
| 1334 | windows_flavor = "95, 95A, or 95B"; |
| 1335 | break; |
| 1336 | case 3: |
| 1337 | windows_flavor = "95B OSR2.1 or 95C OSR2.5"; |
| 1338 | break; |
| 1339 | case 10: |
| 1340 | windows_flavor = "98 or 98 SE"; |
| 1341 | break; |
| 1342 | case 90: |
| 1343 | windows_flavor = "ME"; |
| 1344 | break; |
| 1345 | default: |
| 1346 | windows_flavor = "9X"; |
| 1347 | break; |
| 1348 | } |
| 1349 | break; |
| 1350 | default: |
| 1351 | windows_flavor = "??"; |
| 1352 | break; |
| 1353 | } |
| 1354 | printf_filtered ("%s)\n", windows_flavor); |
| 1355 | } |
| 1356 | else if (true_dos_version == 0x532 && advertized_dos_version == 0x500) |
| 1357 | printf_filtered ("Windows Version................" |
| 1358 | "Windows NT family (W2K/XP/W2K3/Vista/W2K8)\n"); |
| 1359 | puts_filtered ("\n"); |
| 1360 | /* On some versions of Windows, __dpmi_get_capabilities returns |
| 1361 | zero, but the buffer is not filled with info, so we fill the |
| 1362 | buffer with a known pattern and test for it afterwards. */ |
| 1363 | memcpy (dpmi_vendor_info, test_pattern, sizeof(dpmi_vendor_info)); |
| 1364 | dpmi_vendor_available = |
| 1365 | __dpmi_get_capabilities (&dpmi_flags, dpmi_vendor_info); |
| 1366 | if (dpmi_vendor_available == 0 |
| 1367 | && memcmp (dpmi_vendor_info, test_pattern, |
| 1368 | sizeof(dpmi_vendor_info)) != 0) |
| 1369 | { |
| 1370 | /* The DPMI spec says the vendor string should be ASCIIZ, but |
| 1371 | I don't trust the vendors to follow that... */ |
| 1372 | if (!memchr (&dpmi_vendor_info[2], 0, 126)) |
| 1373 | dpmi_vendor_info[128] = '\0'; |
| 1374 | printf_filtered ("DPMI Host......................" |
| 1375 | "%s v%d.%d (capabilities: %#x)\n", |
| 1376 | &dpmi_vendor_info[2], |
| 1377 | (unsigned)dpmi_vendor_info[0], |
| 1378 | (unsigned)dpmi_vendor_info[1], |
| 1379 | ((unsigned)dpmi_flags & 0x7f)); |
| 1380 | } |
| 1381 | else |
| 1382 | printf_filtered ("DPMI Host......................(Info not available)\n"); |
| 1383 | __dpmi_get_version (&dpmi_version_data); |
| 1384 | printf_filtered ("DPMI Version...................%d.%02d\n", |
| 1385 | dpmi_version_data.major, dpmi_version_data.minor); |
| 1386 | printf_filtered ("DPMI Info......................" |
| 1387 | "%s-bit DPMI, with%s Virtual Memory support\n", |
| 1388 | (dpmi_version_data.flags & 1) ? "32" : "16", |
| 1389 | (dpmi_version_data.flags & 4) ? "" : "out"); |
| 1390 | printfi_filtered (31, "Interrupts reflected to %s mode\n", |
| 1391 | (dpmi_version_data.flags & 2) ? "V86" : "Real"); |
| 1392 | printfi_filtered (31, "Processor type: i%d86\n", |
| 1393 | dpmi_version_data.cpu); |
| 1394 | printfi_filtered (31, "PIC base interrupt: Master: %#x Slave: %#x\n", |
| 1395 | dpmi_version_data.master_pic, dpmi_version_data.slave_pic); |
| 1396 | |
| 1397 | /* a_tss is only initialized when the debuggee is first run. */ |
| 1398 | if (prog_has_started) |
| 1399 | { |
| 1400 | __asm__ __volatile__ ("pushfl ; popl %0" : "=g" (eflags)); |
| 1401 | printf_filtered ("Protection....................." |
| 1402 | "Ring %d (in %s), with%s I/O protection\n", |
| 1403 | a_tss.tss_cs & 3, (a_tss.tss_cs & 4) ? "LDT" : "GDT", |
| 1404 | (a_tss.tss_cs & 3) > ((eflags >> 12) & 3) ? "" : "out"); |
| 1405 | } |
| 1406 | puts_filtered ("\n"); |
| 1407 | __dpmi_get_free_memory_information (&mem_info); |
| 1408 | print_mem (mem_info.total_number_of_physical_pages, |
| 1409 | "DPMI Total Physical Memory.....", 1); |
| 1410 | print_mem (mem_info.total_number_of_free_pages, |
| 1411 | "DPMI Free Physical Memory......", 1); |
| 1412 | print_mem (mem_info.size_of_paging_file_partition_in_pages, |
| 1413 | "DPMI Swap Space................", 1); |
| 1414 | print_mem (mem_info.linear_address_space_size_in_pages, |
| 1415 | "DPMI Total Linear Address Size.", 1); |
| 1416 | print_mem (mem_info.free_linear_address_space_in_pages, |
| 1417 | "DPMI Free Linear Address Size..", 1); |
| 1418 | print_mem (mem_info.largest_available_free_block_in_bytes, |
| 1419 | "DPMI Largest Free Memory Block.", 0); |
| 1420 | |
| 1421 | regs.h.ah = 0x48; |
| 1422 | regs.x.bx = 0xffff; |
| 1423 | __dpmi_int (0x21, ®s); |
| 1424 | print_mem (regs.x.bx << 4, "Free DOS Memory................", 0); |
| 1425 | regs.x.ax = 0x5800; |
| 1426 | __dpmi_int (0x21, ®s); |
| 1427 | if ((regs.x.flags & 1) == 0) |
| 1428 | { |
| 1429 | static const char *dos_hilo[] = { |
| 1430 | "Low", "", "", "", "High", "", "", "", "High, then Low" |
| 1431 | }; |
| 1432 | static const char *dos_fit[] = { |
| 1433 | "First", "Best", "Last" |
| 1434 | }; |
| 1435 | int hilo_idx = (regs.x.ax >> 4) & 0x0f; |
| 1436 | int fit_idx = regs.x.ax & 0x0f; |
| 1437 | |
| 1438 | if (hilo_idx > 8) |
| 1439 | hilo_idx = 0; |
| 1440 | if (fit_idx > 2) |
| 1441 | fit_idx = 0; |
| 1442 | printf_filtered ("DOS Memory Allocation..........%s memory, %s fit\n", |
| 1443 | dos_hilo[hilo_idx], dos_fit[fit_idx]); |
| 1444 | regs.x.ax = 0x5802; |
| 1445 | __dpmi_int (0x21, ®s); |
| 1446 | if ((regs.x.flags & 1) != 0) |
| 1447 | regs.h.al = 0; |
| 1448 | printfi_filtered (31, "UMBs %sin DOS memory chain\n", |
| 1449 | regs.h.al == 0 ? "not " : ""); |
| 1450 | } |
| 1451 | } |
| 1452 | |
| 1453 | struct seg_descr { |
| 1454 | unsigned short limit0; |
| 1455 | unsigned short base0; |
| 1456 | unsigned char base1; |
| 1457 | unsigned stype:5; |
| 1458 | unsigned dpl:2; |
| 1459 | unsigned present:1; |
| 1460 | unsigned limit1:4; |
| 1461 | unsigned available:1; |
| 1462 | unsigned dummy:1; |
| 1463 | unsigned bit32:1; |
| 1464 | unsigned page_granular:1; |
| 1465 | unsigned char base2; |
| 1466 | } __attribute__ ((packed)); |
| 1467 | |
| 1468 | struct gate_descr { |
| 1469 | unsigned short offset0; |
| 1470 | unsigned short selector; |
| 1471 | unsigned param_count:5; |
| 1472 | unsigned dummy:3; |
| 1473 | unsigned stype:5; |
| 1474 | unsigned dpl:2; |
| 1475 | unsigned present:1; |
| 1476 | unsigned short offset1; |
| 1477 | } __attribute__ ((packed)); |
| 1478 | |
| 1479 | /* Read LEN bytes starting at logical address ADDR, and put the result |
| 1480 | into DEST. Return 1 if success, zero if not. */ |
| 1481 | static int |
| 1482 | read_memory_region (unsigned long addr, void *dest, size_t len) |
| 1483 | { |
| 1484 | unsigned long dos_ds_limit = __dpmi_get_segment_limit (_dos_ds); |
| 1485 | int retval = 1; |
| 1486 | |
| 1487 | /* For the low memory, we can simply use _dos_ds. */ |
| 1488 | if (addr <= dos_ds_limit - len) |
| 1489 | dosmemget (addr, len, dest); |
| 1490 | else |
| 1491 | { |
| 1492 | /* For memory above 1MB we need to set up a special segment to |
| 1493 | be able to access that memory. */ |
| 1494 | int sel = __dpmi_allocate_ldt_descriptors (1); |
| 1495 | |
| 1496 | if (sel <= 0) |
| 1497 | retval = 0; |
| 1498 | else |
| 1499 | { |
| 1500 | int access_rights = __dpmi_get_descriptor_access_rights (sel); |
| 1501 | size_t segment_limit = len - 1; |
| 1502 | |
| 1503 | /* Make sure the crucial bits in the descriptor access |
| 1504 | rights are set correctly. Some DPMI providers might barf |
| 1505 | if we set the segment limit to something that is not an |
| 1506 | integral multiple of 4KB pages if the granularity bit is |
| 1507 | not set to byte-granular, even though the DPMI spec says |
| 1508 | it's the host's responsibility to set that bit correctly. */ |
| 1509 | if (len > 1024 * 1024) |
| 1510 | { |
| 1511 | access_rights |= 0x8000; |
| 1512 | /* Page-granular segments should have the low 12 bits of |
| 1513 | the limit set. */ |
| 1514 | segment_limit |= 0xfff; |
| 1515 | } |
| 1516 | else |
| 1517 | access_rights &= ~0x8000; |
| 1518 | |
| 1519 | if (__dpmi_set_segment_base_address (sel, addr) != -1 |
| 1520 | && __dpmi_set_descriptor_access_rights (sel, access_rights) != -1 |
| 1521 | && __dpmi_set_segment_limit (sel, segment_limit) != -1 |
| 1522 | /* W2K silently fails to set the segment limit, leaving |
| 1523 | it at zero; this test avoids the resulting crash. */ |
| 1524 | && __dpmi_get_segment_limit (sel) >= segment_limit) |
| 1525 | movedata (sel, 0, _my_ds (), (unsigned)dest, len); |
| 1526 | else |
| 1527 | retval = 0; |
| 1528 | |
| 1529 | __dpmi_free_ldt_descriptor (sel); |
| 1530 | } |
| 1531 | } |
| 1532 | return retval; |
| 1533 | } |
| 1534 | |
| 1535 | /* Get a segment descriptor stored at index IDX in the descriptor |
| 1536 | table whose base address is TABLE_BASE. Return the descriptor |
| 1537 | type, or -1 if failure. */ |
| 1538 | static int |
| 1539 | get_descriptor (unsigned long table_base, int idx, void *descr) |
| 1540 | { |
| 1541 | unsigned long addr = table_base + idx * 8; /* 8 bytes per entry */ |
| 1542 | |
| 1543 | if (read_memory_region (addr, descr, 8)) |
| 1544 | return (int)((struct seg_descr *)descr)->stype; |
| 1545 | return -1; |
| 1546 | } |
| 1547 | |
| 1548 | struct dtr_reg { |
| 1549 | unsigned short limit __attribute__((packed)); |
| 1550 | unsigned long base __attribute__((packed)); |
| 1551 | }; |
| 1552 | |
| 1553 | /* Display a segment descriptor stored at index IDX in a descriptor |
| 1554 | table whose type is TYPE and whose base address is BASE_ADDR. If |
| 1555 | FORCE is non-zero, display even invalid descriptors. */ |
| 1556 | static void |
| 1557 | display_descriptor (unsigned type, unsigned long base_addr, int idx, int force) |
| 1558 | { |
| 1559 | struct seg_descr descr; |
| 1560 | struct gate_descr gate; |
| 1561 | |
| 1562 | /* Get the descriptor from the table. */ |
| 1563 | if (idx == 0 && type == 0) |
| 1564 | puts_filtered ("0x000: null descriptor\n"); |
| 1565 | else if (get_descriptor (base_addr, idx, &descr) != -1) |
| 1566 | { |
| 1567 | /* For each type of descriptor table, this has a bit set if the |
| 1568 | corresponding type of selectors is valid in that table. */ |
| 1569 | static unsigned allowed_descriptors[] = { |
| 1570 | 0xffffdafeL, /* GDT */ |
| 1571 | 0x0000c0e0L, /* IDT */ |
| 1572 | 0xffffdafaL /* LDT */ |
| 1573 | }; |
| 1574 | |
| 1575 | /* If the program hasn't started yet, assume the debuggee will |
| 1576 | have the same CPL as the debugger. */ |
| 1577 | int cpl = prog_has_started ? (a_tss.tss_cs & 3) : _my_cs () & 3; |
| 1578 | unsigned long limit = (descr.limit1 << 16) | descr.limit0; |
| 1579 | |
| 1580 | if (descr.present |
| 1581 | && (allowed_descriptors[type] & (1 << descr.stype)) != 0) |
| 1582 | { |
| 1583 | printf_filtered ("0x%03x: ", |
| 1584 | type == 1 |
| 1585 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); |
| 1586 | if (descr.page_granular) |
| 1587 | limit = (limit << 12) | 0xfff; /* big segment: low 12 bit set */ |
| 1588 | if (descr.stype == 1 || descr.stype == 2 || descr.stype == 3 |
| 1589 | || descr.stype == 9 || descr.stype == 11 |
| 1590 | || (descr.stype >= 16 && descr.stype < 32)) |
| 1591 | printf_filtered ("base=0x%02x%02x%04x limit=0x%08lx", |
| 1592 | descr.base2, descr.base1, descr.base0, limit); |
| 1593 | |
| 1594 | switch (descr.stype) |
| 1595 | { |
| 1596 | case 1: |
| 1597 | case 3: |
| 1598 | printf_filtered (" 16-bit TSS (task %sactive)", |
| 1599 | descr.stype == 3 ? "" : "in"); |
| 1600 | break; |
| 1601 | case 2: |
| 1602 | puts_filtered (" LDT"); |
| 1603 | break; |
| 1604 | case 4: |
| 1605 | memcpy (&gate, &descr, sizeof gate); |
| 1606 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", |
| 1607 | gate.selector, gate.offset1, gate.offset0); |
| 1608 | printf_filtered (" 16-bit Call Gate (params=%d)", |
| 1609 | gate.param_count); |
| 1610 | break; |
| 1611 | case 5: |
| 1612 | printf_filtered ("TSS selector=0x%04x", descr.base0); |
| 1613 | printfi_filtered (16, "Task Gate"); |
| 1614 | break; |
| 1615 | case 6: |
| 1616 | case 7: |
| 1617 | memcpy (&gate, &descr, sizeof gate); |
| 1618 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", |
| 1619 | gate.selector, gate.offset1, gate.offset0); |
| 1620 | printf_filtered (" 16-bit %s Gate", |
| 1621 | descr.stype == 6 ? "Interrupt" : "Trap"); |
| 1622 | break; |
| 1623 | case 9: |
| 1624 | case 11: |
| 1625 | printf_filtered (" 32-bit TSS (task %sactive)", |
| 1626 | descr.stype == 3 ? "" : "in"); |
| 1627 | break; |
| 1628 | case 12: |
| 1629 | memcpy (&gate, &descr, sizeof gate); |
| 1630 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", |
| 1631 | gate.selector, gate.offset1, gate.offset0); |
| 1632 | printf_filtered (" 32-bit Call Gate (params=%d)", |
| 1633 | gate.param_count); |
| 1634 | break; |
| 1635 | case 14: |
| 1636 | case 15: |
| 1637 | memcpy (&gate, &descr, sizeof gate); |
| 1638 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", |
| 1639 | gate.selector, gate.offset1, gate.offset0); |
| 1640 | printf_filtered (" 32-bit %s Gate", |
| 1641 | descr.stype == 14 ? "Interrupt" : "Trap"); |
| 1642 | break; |
| 1643 | case 16: /* data segments */ |
| 1644 | case 17: |
| 1645 | case 18: |
| 1646 | case 19: |
| 1647 | case 20: |
| 1648 | case 21: |
| 1649 | case 22: |
| 1650 | case 23: |
| 1651 | printf_filtered (" %s-bit Data (%s Exp-%s%s)", |
| 1652 | descr.bit32 ? "32" : "16", |
| 1653 | descr.stype & 2 |
| 1654 | ? "Read/Write," : "Read-Only, ", |
| 1655 | descr.stype & 4 ? "down" : "up", |
| 1656 | descr.stype & 1 ? "" : ", N.Acc"); |
| 1657 | break; |
| 1658 | case 24: /* code segments */ |
| 1659 | case 25: |
| 1660 | case 26: |
| 1661 | case 27: |
| 1662 | case 28: |
| 1663 | case 29: |
| 1664 | case 30: |
| 1665 | case 31: |
| 1666 | printf_filtered (" %s-bit Code (%s, %sConf%s)", |
| 1667 | descr.bit32 ? "32" : "16", |
| 1668 | descr.stype & 2 ? "Exec/Read" : "Exec-Only", |
| 1669 | descr.stype & 4 ? "" : "N.", |
| 1670 | descr.stype & 1 ? "" : ", N.Acc"); |
| 1671 | break; |
| 1672 | default: |
| 1673 | printf_filtered ("Unknown type 0x%02x", descr.stype); |
| 1674 | break; |
| 1675 | } |
| 1676 | puts_filtered ("\n"); |
| 1677 | } |
| 1678 | else if (force) |
| 1679 | { |
| 1680 | printf_filtered ("0x%03x: ", |
| 1681 | type == 1 |
| 1682 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); |
| 1683 | if (!descr.present) |
| 1684 | puts_filtered ("Segment not present\n"); |
| 1685 | else |
| 1686 | printf_filtered ("Segment type 0x%02x is invalid in this table\n", |
| 1687 | descr.stype); |
| 1688 | } |
| 1689 | } |
| 1690 | else if (force) |
| 1691 | printf_filtered ("0x%03x: Cannot read this descriptor\n", idx); |
| 1692 | } |
| 1693 | |
| 1694 | static void |
| 1695 | go32_sldt (char *arg, int from_tty) |
| 1696 | { |
| 1697 | struct dtr_reg gdtr; |
| 1698 | unsigned short ldtr = 0; |
| 1699 | int ldt_idx; |
| 1700 | struct seg_descr ldt_descr; |
| 1701 | long ldt_entry = -1L; |
| 1702 | int cpl = (prog_has_started ? a_tss.tss_cs : _my_cs ()) & 3; |
| 1703 | |
| 1704 | if (arg && *arg) |
| 1705 | { |
| 1706 | arg = skip_spaces (arg); |
| 1707 | |
| 1708 | if (*arg) |
| 1709 | { |
| 1710 | ldt_entry = parse_and_eval_long (arg); |
| 1711 | if (ldt_entry < 0 |
| 1712 | || (ldt_entry & 4) == 0 |
| 1713 | || (ldt_entry & 3) != (cpl & 3)) |
| 1714 | error (_("Invalid LDT entry 0x%03lx."), (unsigned long)ldt_entry); |
| 1715 | } |
| 1716 | } |
| 1717 | |
| 1718 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); |
| 1719 | __asm__ __volatile__ ("sldt %0" : "=m" (ldtr) : /* no inputs */ ); |
| 1720 | ldt_idx = ldtr / 8; |
| 1721 | if (ldt_idx == 0) |
| 1722 | puts_filtered ("There is no LDT.\n"); |
| 1723 | /* LDT's entry in the GDT must have the type LDT, which is 2. */ |
| 1724 | else if (get_descriptor (gdtr.base, ldt_idx, &ldt_descr) != 2) |
| 1725 | printf_filtered ("LDT is present (at %#x), but unreadable by GDB.\n", |
| 1726 | ldt_descr.base0 |
| 1727 | | (ldt_descr.base1 << 16) |
| 1728 | | (ldt_descr.base2 << 24)); |
| 1729 | else |
| 1730 | { |
| 1731 | unsigned base = |
| 1732 | ldt_descr.base0 |
| 1733 | | (ldt_descr.base1 << 16) |
| 1734 | | (ldt_descr.base2 << 24); |
| 1735 | unsigned limit = ldt_descr.limit0 | (ldt_descr.limit1 << 16); |
| 1736 | int max_entry; |
| 1737 | |
| 1738 | if (ldt_descr.page_granular) |
| 1739 | /* Page-granular segments must have the low 12 bits of their |
| 1740 | limit set. */ |
| 1741 | limit = (limit << 12) | 0xfff; |
| 1742 | /* LDT cannot have more than 8K 8-byte entries, i.e. more than |
| 1743 | 64KB. */ |
| 1744 | if (limit > 0xffff) |
| 1745 | limit = 0xffff; |
| 1746 | |
| 1747 | max_entry = (limit + 1) / 8; |
| 1748 | |
| 1749 | if (ldt_entry >= 0) |
| 1750 | { |
| 1751 | if (ldt_entry > limit) |
| 1752 | error (_("Invalid LDT entry %#lx: outside valid limits [0..%#x]"), |
| 1753 | (unsigned long)ldt_entry, limit); |
| 1754 | |
| 1755 | display_descriptor (ldt_descr.stype, base, ldt_entry / 8, 1); |
| 1756 | } |
| 1757 | else |
| 1758 | { |
| 1759 | int i; |
| 1760 | |
| 1761 | for (i = 0; i < max_entry; i++) |
| 1762 | display_descriptor (ldt_descr.stype, base, i, 0); |
| 1763 | } |
| 1764 | } |
| 1765 | } |
| 1766 | |
| 1767 | static void |
| 1768 | go32_sgdt (char *arg, int from_tty) |
| 1769 | { |
| 1770 | struct dtr_reg gdtr; |
| 1771 | long gdt_entry = -1L; |
| 1772 | int max_entry; |
| 1773 | |
| 1774 | if (arg && *arg) |
| 1775 | { |
| 1776 | arg = skip_spaces (arg); |
| 1777 | |
| 1778 | if (*arg) |
| 1779 | { |
| 1780 | gdt_entry = parse_and_eval_long (arg); |
| 1781 | if (gdt_entry < 0 || (gdt_entry & 7) != 0) |
| 1782 | error (_("Invalid GDT entry 0x%03lx: " |
| 1783 | "not an integral multiple of 8."), |
| 1784 | (unsigned long)gdt_entry); |
| 1785 | } |
| 1786 | } |
| 1787 | |
| 1788 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); |
| 1789 | max_entry = (gdtr.limit + 1) / 8; |
| 1790 | |
| 1791 | if (gdt_entry >= 0) |
| 1792 | { |
| 1793 | if (gdt_entry > gdtr.limit) |
| 1794 | error (_("Invalid GDT entry %#lx: outside valid limits [0..%#x]"), |
| 1795 | (unsigned long)gdt_entry, gdtr.limit); |
| 1796 | |
| 1797 | display_descriptor (0, gdtr.base, gdt_entry / 8, 1); |
| 1798 | } |
| 1799 | else |
| 1800 | { |
| 1801 | int i; |
| 1802 | |
| 1803 | for (i = 0; i < max_entry; i++) |
| 1804 | display_descriptor (0, gdtr.base, i, 0); |
| 1805 | } |
| 1806 | } |
| 1807 | |
| 1808 | static void |
| 1809 | go32_sidt (char *arg, int from_tty) |
| 1810 | { |
| 1811 | struct dtr_reg idtr; |
| 1812 | long idt_entry = -1L; |
| 1813 | int max_entry; |
| 1814 | |
| 1815 | if (arg && *arg) |
| 1816 | { |
| 1817 | arg = skip_spaces (arg); |
| 1818 | |
| 1819 | if (*arg) |
| 1820 | { |
| 1821 | idt_entry = parse_and_eval_long (arg); |
| 1822 | if (idt_entry < 0) |
| 1823 | error (_("Invalid (negative) IDT entry %ld."), idt_entry); |
| 1824 | } |
| 1825 | } |
| 1826 | |
| 1827 | __asm__ __volatile__ ("sidt %0" : "=m" (idtr) : /* no inputs */ ); |
| 1828 | max_entry = (idtr.limit + 1) / 8; |
| 1829 | if (max_entry > 0x100) /* No more than 256 entries. */ |
| 1830 | max_entry = 0x100; |
| 1831 | |
| 1832 | if (idt_entry >= 0) |
| 1833 | { |
| 1834 | if (idt_entry > idtr.limit) |
| 1835 | error (_("Invalid IDT entry %#lx: outside valid limits [0..%#x]"), |
| 1836 | (unsigned long)idt_entry, idtr.limit); |
| 1837 | |
| 1838 | display_descriptor (1, idtr.base, idt_entry, 1); |
| 1839 | } |
| 1840 | else |
| 1841 | { |
| 1842 | int i; |
| 1843 | |
| 1844 | for (i = 0; i < max_entry; i++) |
| 1845 | display_descriptor (1, idtr.base, i, 0); |
| 1846 | } |
| 1847 | } |
| 1848 | |
| 1849 | /* Cached linear address of the base of the page directory. For |
| 1850 | now, available only under CWSDPMI. Code based on ideas and |
| 1851 | suggestions from Charles Sandmann <sandmann@clio.rice.edu>. */ |
| 1852 | static unsigned long pdbr; |
| 1853 | |
| 1854 | static unsigned long |
| 1855 | get_cr3 (void) |
| 1856 | { |
| 1857 | unsigned offset; |
| 1858 | unsigned taskreg; |
| 1859 | unsigned long taskbase, cr3; |
| 1860 | struct dtr_reg gdtr; |
| 1861 | |
| 1862 | if (pdbr > 0 && pdbr <= 0xfffff) |
| 1863 | return pdbr; |
| 1864 | |
| 1865 | /* Get the linear address of GDT and the Task Register. */ |
| 1866 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); |
| 1867 | __asm__ __volatile__ ("str %0" : "=m" (taskreg) : /* no inputs */ ); |
| 1868 | |
| 1869 | /* Task Register is a segment selector for the TSS of the current |
| 1870 | task. Therefore, it can be used as an index into the GDT to get |
| 1871 | at the segment descriptor for the TSS. To get the index, reset |
| 1872 | the low 3 bits of the selector (which give the CPL). Add 2 to the |
| 1873 | offset to point to the 3 low bytes of the base address. */ |
| 1874 | offset = gdtr.base + (taskreg & 0xfff8) + 2; |
| 1875 | |
| 1876 | |
| 1877 | /* CWSDPMI's task base is always under the 1MB mark. */ |
| 1878 | if (offset > 0xfffff) |
| 1879 | return 0; |
| 1880 | |
| 1881 | _farsetsel (_dos_ds); |
| 1882 | taskbase = _farnspeekl (offset) & 0xffffffU; |
| 1883 | taskbase += _farnspeekl (offset + 2) & 0xff000000U; |
| 1884 | if (taskbase > 0xfffff) |
| 1885 | return 0; |
| 1886 | |
| 1887 | /* CR3 (a.k.a. PDBR, the Page Directory Base Register) is stored at |
| 1888 | offset 1Ch in the TSS. */ |
| 1889 | cr3 = _farnspeekl (taskbase + 0x1c) & ~0xfff; |
| 1890 | if (cr3 > 0xfffff) |
| 1891 | { |
| 1892 | #if 0 /* Not fullly supported yet. */ |
| 1893 | /* The Page Directory is in UMBs. In that case, CWSDPMI puts |
| 1894 | the first Page Table right below the Page Directory. Thus, |
| 1895 | the first Page Table's entry for its own address and the Page |
| 1896 | Directory entry for that Page Table will hold the same |
| 1897 | physical address. The loop below searches the entire UMB |
| 1898 | range of addresses for such an occurence. */ |
| 1899 | unsigned long addr, pte_idx; |
| 1900 | |
| 1901 | for (addr = 0xb0000, pte_idx = 0xb0; |
| 1902 | pte_idx < 0xff; |
| 1903 | addr += 0x1000, pte_idx++) |
| 1904 | { |
| 1905 | if (((_farnspeekl (addr + 4 * pte_idx) & 0xfffff027) == |
| 1906 | (_farnspeekl (addr + 0x1000) & 0xfffff027)) |
| 1907 | && ((_farnspeekl (addr + 4 * pte_idx + 4) & 0xfffff000) == cr3)) |
| 1908 | { |
| 1909 | cr3 = addr + 0x1000; |
| 1910 | break; |
| 1911 | } |
| 1912 | } |
| 1913 | #endif |
| 1914 | |
| 1915 | if (cr3 > 0xfffff) |
| 1916 | cr3 = 0; |
| 1917 | } |
| 1918 | |
| 1919 | return cr3; |
| 1920 | } |
| 1921 | |
| 1922 | /* Return the N'th Page Directory entry. */ |
| 1923 | static unsigned long |
| 1924 | get_pde (int n) |
| 1925 | { |
| 1926 | unsigned long pde = 0; |
| 1927 | |
| 1928 | if (pdbr && n >= 0 && n < 1024) |
| 1929 | { |
| 1930 | pde = _farpeekl (_dos_ds, pdbr + 4*n); |
| 1931 | } |
| 1932 | return pde; |
| 1933 | } |
| 1934 | |
| 1935 | /* Return the N'th entry of the Page Table whose Page Directory entry |
| 1936 | is PDE. */ |
| 1937 | static unsigned long |
| 1938 | get_pte (unsigned long pde, int n) |
| 1939 | { |
| 1940 | unsigned long pte = 0; |
| 1941 | |
| 1942 | /* pde & 0x80 tests the 4MB page bit. We don't support 4MB |
| 1943 | page tables, for now. */ |
| 1944 | if ((pde & 1) && !(pde & 0x80) && n >= 0 && n < 1024) |
| 1945 | { |
| 1946 | pde &= ~0xfff; /* Clear non-address bits. */ |
| 1947 | pte = _farpeekl (_dos_ds, pde + 4*n); |
| 1948 | } |
| 1949 | return pte; |
| 1950 | } |
| 1951 | |
| 1952 | /* Display a Page Directory or Page Table entry. IS_DIR, if non-zero, |
| 1953 | says this is a Page Directory entry. If FORCE is non-zero, display |
| 1954 | the entry even if its Present flag is off. OFF is the offset of the |
| 1955 | address from the page's base address. */ |
| 1956 | static void |
| 1957 | display_ptable_entry (unsigned long entry, int is_dir, int force, unsigned off) |
| 1958 | { |
| 1959 | if ((entry & 1) != 0) |
| 1960 | { |
| 1961 | printf_filtered ("Base=0x%05lx000", entry >> 12); |
| 1962 | if ((entry & 0x100) && !is_dir) |
| 1963 | puts_filtered (" Global"); |
| 1964 | if ((entry & 0x40) && !is_dir) |
| 1965 | puts_filtered (" Dirty"); |
| 1966 | printf_filtered (" %sAcc.", (entry & 0x20) ? "" : "Not-"); |
| 1967 | printf_filtered (" %sCached", (entry & 0x10) ? "" : "Not-"); |
| 1968 | printf_filtered (" Write-%s", (entry & 8) ? "Thru" : "Back"); |
| 1969 | printf_filtered (" %s", (entry & 4) ? "Usr" : "Sup"); |
| 1970 | printf_filtered (" Read-%s", (entry & 2) ? "Write" : "Only"); |
| 1971 | if (off) |
| 1972 | printf_filtered (" +0x%x", off); |
| 1973 | puts_filtered ("\n"); |
| 1974 | } |
| 1975 | else if (force) |
| 1976 | printf_filtered ("Page%s not present or not supported; value=0x%lx.\n", |
| 1977 | is_dir ? " Table" : "", entry >> 1); |
| 1978 | } |
| 1979 | |
| 1980 | static void |
| 1981 | go32_pde (char *arg, int from_tty) |
| 1982 | { |
| 1983 | long pde_idx = -1, i; |
| 1984 | |
| 1985 | if (arg && *arg) |
| 1986 | { |
| 1987 | arg = skip_spaces (arg); |
| 1988 | |
| 1989 | if (*arg) |
| 1990 | { |
| 1991 | pde_idx = parse_and_eval_long (arg); |
| 1992 | if (pde_idx < 0 || pde_idx >= 1024) |
| 1993 | error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx); |
| 1994 | } |
| 1995 | } |
| 1996 | |
| 1997 | pdbr = get_cr3 (); |
| 1998 | if (!pdbr) |
| 1999 | puts_filtered ("Access to Page Directories is " |
| 2000 | "not supported on this system.\n"); |
| 2001 | else if (pde_idx >= 0) |
| 2002 | display_ptable_entry (get_pde (pde_idx), 1, 1, 0); |
| 2003 | else |
| 2004 | for (i = 0; i < 1024; i++) |
| 2005 | display_ptable_entry (get_pde (i), 1, 0, 0); |
| 2006 | } |
| 2007 | |
| 2008 | /* A helper function to display entries in a Page Table pointed to by |
| 2009 | the N'th entry in the Page Directory. If FORCE is non-zero, say |
| 2010 | something even if the Page Table is not accessible. */ |
| 2011 | static void |
| 2012 | display_page_table (long n, int force) |
| 2013 | { |
| 2014 | unsigned long pde = get_pde (n); |
| 2015 | |
| 2016 | if ((pde & 1) != 0) |
| 2017 | { |
| 2018 | int i; |
| 2019 | |
| 2020 | printf_filtered ("Page Table pointed to by " |
| 2021 | "Page Directory entry 0x%lx:\n", n); |
| 2022 | for (i = 0; i < 1024; i++) |
| 2023 | display_ptable_entry (get_pte (pde, i), 0, 0, 0); |
| 2024 | puts_filtered ("\n"); |
| 2025 | } |
| 2026 | else if (force) |
| 2027 | printf_filtered ("Page Table not present; value=0x%lx.\n", pde >> 1); |
| 2028 | } |
| 2029 | |
| 2030 | static void |
| 2031 | go32_pte (char *arg, int from_tty) |
| 2032 | { |
| 2033 | long pde_idx = -1L, i; |
| 2034 | |
| 2035 | if (arg && *arg) |
| 2036 | { |
| 2037 | arg = skip_spaces (arg); |
| 2038 | |
| 2039 | if (*arg) |
| 2040 | { |
| 2041 | pde_idx = parse_and_eval_long (arg); |
| 2042 | if (pde_idx < 0 || pde_idx >= 1024) |
| 2043 | error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx); |
| 2044 | } |
| 2045 | } |
| 2046 | |
| 2047 | pdbr = get_cr3 (); |
| 2048 | if (!pdbr) |
| 2049 | puts_filtered ("Access to Page Tables is not supported on this system.\n"); |
| 2050 | else if (pde_idx >= 0) |
| 2051 | display_page_table (pde_idx, 1); |
| 2052 | else |
| 2053 | for (i = 0; i < 1024; i++) |
| 2054 | display_page_table (i, 0); |
| 2055 | } |
| 2056 | |
| 2057 | static void |
| 2058 | go32_pte_for_address (char *arg, int from_tty) |
| 2059 | { |
| 2060 | CORE_ADDR addr = 0, i; |
| 2061 | |
| 2062 | if (arg && *arg) |
| 2063 | { |
| 2064 | arg = skip_spaces (arg); |
| 2065 | |
| 2066 | if (*arg) |
| 2067 | addr = parse_and_eval_address (arg); |
| 2068 | } |
| 2069 | if (!addr) |
| 2070 | error_no_arg (_("linear address")); |
| 2071 | |
| 2072 | pdbr = get_cr3 (); |
| 2073 | if (!pdbr) |
| 2074 | puts_filtered ("Access to Page Tables is not supported on this system.\n"); |
| 2075 | else |
| 2076 | { |
| 2077 | int pde_idx = (addr >> 22) & 0x3ff; |
| 2078 | int pte_idx = (addr >> 12) & 0x3ff; |
| 2079 | unsigned offs = addr & 0xfff; |
| 2080 | |
| 2081 | printf_filtered ("Page Table entry for address %s:\n", |
| 2082 | hex_string(addr)); |
| 2083 | display_ptable_entry (get_pte (get_pde (pde_idx), pte_idx), 0, 1, offs); |
| 2084 | } |
| 2085 | } |
| 2086 | |
| 2087 | static struct cmd_list_element *info_dos_cmdlist = NULL; |
| 2088 | |
| 2089 | static void |
| 2090 | go32_info_dos_command (char *args, int from_tty) |
| 2091 | { |
| 2092 | help_list (info_dos_cmdlist, "info dos ", class_info, gdb_stdout); |
| 2093 | } |
| 2094 | |
| 2095 | /* -Wmissing-prototypes */ |
| 2096 | extern initialize_file_ftype _initialize_go32_nat; |
| 2097 | |
| 2098 | void |
| 2099 | _initialize_go32_nat (void) |
| 2100 | { |
| 2101 | init_go32_ops (); |
| 2102 | add_target (&go32_ops); |
| 2103 | |
| 2104 | add_prefix_cmd ("dos", class_info, go32_info_dos_command, _("\ |
| 2105 | Print information specific to DJGPP (aka MS-DOS) debugging."), |
| 2106 | &info_dos_cmdlist, "info dos ", 0, &infolist); |
| 2107 | |
| 2108 | add_cmd ("sysinfo", class_info, go32_sysinfo, _("\ |
| 2109 | Display information about the target system, including CPU, OS, DPMI, etc."), |
| 2110 | &info_dos_cmdlist); |
| 2111 | add_cmd ("ldt", class_info, go32_sldt, _("\ |
| 2112 | Display entries in the LDT (Local Descriptor Table).\n\ |
| 2113 | Entry number (an expression) as an argument means display only that entry."), |
| 2114 | &info_dos_cmdlist); |
| 2115 | add_cmd ("gdt", class_info, go32_sgdt, _("\ |
| 2116 | Display entries in the GDT (Global Descriptor Table).\n\ |
| 2117 | Entry number (an expression) as an argument means display only that entry."), |
| 2118 | &info_dos_cmdlist); |
| 2119 | add_cmd ("idt", class_info, go32_sidt, _("\ |
| 2120 | Display entries in the IDT (Interrupt Descriptor Table).\n\ |
| 2121 | Entry number (an expression) as an argument means display only that entry."), |
| 2122 | &info_dos_cmdlist); |
| 2123 | add_cmd ("pde", class_info, go32_pde, _("\ |
| 2124 | Display entries in the Page Directory.\n\ |
| 2125 | Entry number (an expression) as an argument means display only that entry."), |
| 2126 | &info_dos_cmdlist); |
| 2127 | add_cmd ("pte", class_info, go32_pte, _("\ |
| 2128 | Display entries in Page Tables.\n\ |
| 2129 | Entry number (an expression) as an argument means display only entries\n\ |
| 2130 | from the Page Table pointed to by the specified Page Directory entry."), |
| 2131 | &info_dos_cmdlist); |
| 2132 | add_cmd ("address-pte", class_info, go32_pte_for_address, _("\ |
| 2133 | Display a Page Table entry for a linear address.\n\ |
| 2134 | The address argument must be a linear address, after adding to\n\ |
| 2135 | it the base address of the appropriate segment.\n\ |
| 2136 | The base address of variables and functions in the debuggee's data\n\ |
| 2137 | or code segment is stored in the variable __djgpp_base_address,\n\ |
| 2138 | so use `__djgpp_base_address + (char *)&var' as the argument.\n\ |
| 2139 | For other segments, look up their base address in the output of\n\ |
| 2140 | the `info dos ldt' command."), |
| 2141 | &info_dos_cmdlist); |
| 2142 | } |
| 2143 | |
| 2144 | pid_t |
| 2145 | tcgetpgrp (int fd) |
| 2146 | { |
| 2147 | if (isatty (fd)) |
| 2148 | return SOME_PID; |
| 2149 | errno = ENOTTY; |
| 2150 | return -1; |
| 2151 | } |
| 2152 | |
| 2153 | int |
| 2154 | tcsetpgrp (int fd, pid_t pgid) |
| 2155 | { |
| 2156 | if (isatty (fd) && pgid == SOME_PID) |
| 2157 | return 0; |
| 2158 | errno = pgid == SOME_PID ? ENOTTY : ENOSYS; |
| 2159 | return -1; |
| 2160 | } |