| 1 | /* Native debugging support for Intel x86 running DJGPP. |
| 2 | Copyright 1997, 1999 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 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., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include <fcntl.h> |
| 23 | |
| 24 | #include "defs.h" |
| 25 | #include "frame.h" /* required by inferior.h */ |
| 26 | #include "inferior.h" |
| 27 | #include "target.h" |
| 28 | #include "gdb_wait.h" |
| 29 | #include "gdbcore.h" |
| 30 | #include "command.h" |
| 31 | #include "floatformat.h" |
| 32 | |
| 33 | #include <stdio.h> /* required for __DJGPP_MINOR__ */ |
| 34 | #include <stdlib.h> |
| 35 | #include <string.h> |
| 36 | #include <errno.h> |
| 37 | #include <unistd.h> |
| 38 | #include <io.h> |
| 39 | #include <dpmi.h> |
| 40 | #include <debug/v2load.h> |
| 41 | #include <debug/dbgcom.h> |
| 42 | #if __DJGPP_MINOR__ > 2 |
| 43 | #include <debug/redir.h> |
| 44 | #endif |
| 45 | |
| 46 | #if __DJGPP_MINOR__ < 3 |
| 47 | /* This code will be provided from DJGPP 2.03 on. Until then I code it |
| 48 | here */ |
| 49 | typedef struct |
| 50 | { |
| 51 | unsigned short sig0; |
| 52 | unsigned short sig1; |
| 53 | unsigned short sig2; |
| 54 | unsigned short sig3; |
| 55 | unsigned short exponent:15; |
| 56 | unsigned short sign:1; |
| 57 | } |
| 58 | NPXREG; |
| 59 | |
| 60 | typedef struct |
| 61 | { |
| 62 | unsigned int control; |
| 63 | unsigned int status; |
| 64 | unsigned int tag; |
| 65 | unsigned int eip; |
| 66 | unsigned int cs; |
| 67 | unsigned int dataptr; |
| 68 | unsigned int datasel; |
| 69 | NPXREG reg[8]; |
| 70 | } |
| 71 | NPX; |
| 72 | |
| 73 | static NPX npx; |
| 74 | |
| 75 | static void save_npx (void); /* Save the FPU of the debugged program */ |
| 76 | static void load_npx (void); /* Restore the FPU of the debugged program */ |
| 77 | |
| 78 | /* ------------------------------------------------------------------------- */ |
| 79 | /* Store the contents of the NPX in the global variable `npx'. */ |
| 80 | /* *INDENT-OFF* */ |
| 81 | |
| 82 | static void |
| 83 | save_npx (void) |
| 84 | { |
| 85 | asm ("inb $0xa0, %%al |
| 86 | testb $0x20, %%al |
| 87 | jz 1f |
| 88 | xorb %% al, %%al |
| 89 | outb %% al, $0xf0 |
| 90 | movb $0x20, %%al |
| 91 | outb %% al, $0xa0 |
| 92 | outb %% al, $0x20 |
| 93 | 1: |
| 94 | fnsave % 0 |
| 95 | fwait " |
| 96 | : "=m" (npx) |
| 97 | : /* No input */ |
| 98 | : "%eax"); |
| 99 | } |
| 100 | |
| 101 | /* *INDENT-ON* */ |
| 102 | |
| 103 | |
| 104 | |
| 105 | |
| 106 | |
| 107 | /* ------------------------------------------------------------------------- */ |
| 108 | /* Reload the contents of the NPX from the global variable `npx'. */ |
| 109 | |
| 110 | static void |
| 111 | load_npx (void) |
| 112 | { |
| 113 | asm ("frstor %0":"=m" (npx)); |
| 114 | } |
| 115 | /* ------------------------------------------------------------------------- */ |
| 116 | /* Stubs for the missing redirection functions. */ |
| 117 | typedef struct { |
| 118 | char *command; |
| 119 | int redirected; |
| 120 | } cmdline_t; |
| 121 | |
| 122 | void redir_cmdline_delete (cmdline_t *ptr) {ptr->redirected = 0;} |
| 123 | int redir_cmdline_parse (const char *args, cmdline_t *ptr) |
| 124 | { |
| 125 | return -1; |
| 126 | } |
| 127 | int redir_to_child (cmdline_t *ptr) |
| 128 | { |
| 129 | return 1; |
| 130 | } |
| 131 | int redir_to_debugger (cmdline_t *ptr) |
| 132 | { |
| 133 | return 1; |
| 134 | } |
| 135 | int redir_debug_init (cmdline_t *ptr) { return 0; } |
| 136 | #endif /* __DJGPP_MINOR < 3 */ |
| 137 | |
| 138 | extern void _initialize_go32_nat (void); |
| 139 | |
| 140 | struct env387 |
| 141 | { |
| 142 | unsigned short control; |
| 143 | unsigned short r0; |
| 144 | unsigned short status; |
| 145 | unsigned short r1; |
| 146 | unsigned short tag; |
| 147 | unsigned short r2; |
| 148 | unsigned long eip; |
| 149 | unsigned short code_seg; |
| 150 | unsigned short opcode; |
| 151 | unsigned long operand; |
| 152 | unsigned short operand_seg; |
| 153 | unsigned short r3; |
| 154 | unsigned char regs[8][10]; |
| 155 | }; |
| 156 | |
| 157 | typedef enum { wp_insert, wp_remove, wp_count } wp_op; |
| 158 | |
| 159 | /* This holds the current reference counts for each debug register. */ |
| 160 | static int dr_ref_count[4]; |
| 161 | |
| 162 | extern char **environ; |
| 163 | |
| 164 | #define SOME_PID 42 |
| 165 | |
| 166 | static int prog_has_started = 0; |
| 167 | static void print_387_status (unsigned short status, struct env387 *ep); |
| 168 | static void go32_open (char *name, int from_tty); |
| 169 | static void go32_close (int quitting); |
| 170 | static void go32_attach (char *args, int from_tty); |
| 171 | static void go32_detach (char *args, int from_tty); |
| 172 | static void go32_resume (int pid, int step, enum target_signal siggnal); |
| 173 | static int go32_wait (int pid, struct target_waitstatus *status); |
| 174 | static void go32_fetch_registers (int regno); |
| 175 | static void store_register (int regno); |
| 176 | static void go32_store_registers (int regno); |
| 177 | static void go32_prepare_to_store (void); |
| 178 | static int go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, |
| 179 | int write, struct target_ops *target); |
| 180 | static void go32_files_info (struct target_ops *target); |
| 181 | static void go32_stop (void); |
| 182 | static void go32_kill_inferior (void); |
| 183 | static void go32_create_inferior (char *exec_file, char *args, char **env); |
| 184 | static void cleanup_dregs (void); |
| 185 | static void go32_mourn_inferior (void); |
| 186 | static int go32_can_run (void); |
| 187 | static void ignore (void); |
| 188 | static void ignore2 (char *a, int b); |
| 189 | static int go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
| 190 | int len, int rw); |
| 191 | static int go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
| 192 | int len, int rw); |
| 193 | static int go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr, |
| 194 | CORE_ADDR addr, int len, int rw); |
| 195 | |
| 196 | static struct target_ops go32_ops; |
| 197 | static void go32_terminal_init (void); |
| 198 | static void go32_terminal_inferior (void); |
| 199 | static void go32_terminal_ours (void); |
| 200 | |
| 201 | static void |
| 202 | print_387_status (unsigned short status, struct env387 *ep) |
| 203 | { |
| 204 | int i; |
| 205 | int bothstatus; |
| 206 | int top; |
| 207 | int fpreg; |
| 208 | |
| 209 | bothstatus = ((status != 0) && (ep->status != 0)); |
| 210 | if (status != 0) |
| 211 | { |
| 212 | if (bothstatus) |
| 213 | printf_unfiltered ("u: "); |
| 214 | print_387_status_word (status); |
| 215 | } |
| 216 | |
| 217 | if (ep->status != 0) |
| 218 | { |
| 219 | if (bothstatus) |
| 220 | printf_unfiltered ("e: "); |
| 221 | print_387_status_word (ep->status); |
| 222 | } |
| 223 | |
| 224 | print_387_control_word (ep->control & 0xffff); |
| 225 | /* Other platforms say "last exception", but that's not true: the |
| 226 | FPU stores the last non-control instruction there. */ |
| 227 | printf_unfiltered ("last FP instruction: "); |
| 228 | /* The ORing with D800h restores the upper 5 bits of the opcode that |
| 229 | are not stored by the FPU (since these bits are the same for all |
| 230 | floating-point instructions). */ |
| 231 | printf_unfiltered ("opcode %s; ", |
| 232 | local_hex_string (ep->opcode ? (ep->opcode|0xd800) : 0)); |
| 233 | printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg)); |
| 234 | printf_unfiltered ("%s; ", local_hex_string (ep->eip)); |
| 235 | printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg)); |
| 236 | printf_unfiltered (":%s\n", local_hex_string (ep->operand)); |
| 237 | |
| 238 | top = (ep->status >> 11) & 7; |
| 239 | |
| 240 | printf_unfiltered ("regno tag msb lsb value\n"); |
| 241 | for (fpreg = 7; fpreg >= 0; fpreg--) |
| 242 | { |
| 243 | /* FNSAVE saves the FP registers in their logical TOP-relative |
| 244 | order, beginning with ST(0). Since we need to print them in |
| 245 | their physical order, we have to remap them. */ |
| 246 | int regno = fpreg - top; |
| 247 | long double val; |
| 248 | |
| 249 | if (regno < 0) |
| 250 | regno += 8; |
| 251 | |
| 252 | printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg); |
| 253 | |
| 254 | switch ((ep->tag >> (fpreg * 2)) & 3) |
| 255 | { |
| 256 | case 0: |
| 257 | printf_unfiltered ("valid "); |
| 258 | break; |
| 259 | case 1: |
| 260 | printf_unfiltered ("zero "); |
| 261 | break; |
| 262 | case 2: |
| 263 | /* All other versions of print_387_status use TRAP here, but I |
| 264 | think this is misleading, since Intel manuals say SPECIAL. */ |
| 265 | printf_unfiltered ("special "); |
| 266 | break; |
| 267 | case 3: |
| 268 | printf_unfiltered ("empty "); |
| 269 | break; |
| 270 | } |
| 271 | for (i = 9; i >= 0; i--) |
| 272 | printf_unfiltered ("%02x", ep->regs[regno][i]); |
| 273 | |
| 274 | REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM+regno, builtin_type_long_double, |
| 275 | &ep->regs[regno], &val); |
| 276 | |
| 277 | printf_unfiltered (" %.19LG\n", val); |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | void |
| 282 | i386_go32_float_info (void) |
| 283 | { |
| 284 | print_387_status (0, (struct env387 *) &npx); |
| 285 | } |
| 286 | |
| 287 | #define r_ofs(x) (offsetof(TSS,x)) |
| 288 | |
| 289 | static struct |
| 290 | { |
| 291 | size_t tss_ofs; |
| 292 | size_t size; |
| 293 | } |
| 294 | regno_mapping[] = |
| 295 | { |
| 296 | r_ofs (tss_eax), 4, /* normal registers, from a_tss */ |
| 297 | r_ofs (tss_ecx), 4, |
| 298 | r_ofs (tss_edx), 4, |
| 299 | r_ofs (tss_ebx), 4, |
| 300 | r_ofs (tss_esp), 4, |
| 301 | r_ofs (tss_ebp), 4, |
| 302 | r_ofs (tss_esi), 4, |
| 303 | r_ofs (tss_edi), 4, |
| 304 | r_ofs (tss_eip), 4, |
| 305 | r_ofs (tss_eflags), 4, |
| 306 | r_ofs (tss_cs), 2, |
| 307 | r_ofs (tss_ss), 2, |
| 308 | r_ofs (tss_ds), 2, |
| 309 | r_ofs (tss_es), 2, |
| 310 | r_ofs (tss_fs), 2, |
| 311 | r_ofs (tss_gs), 2, |
| 312 | 0, 10, /* 8 FP registers, from npx.reg[] */ |
| 313 | 1, 10, |
| 314 | 2, 10, |
| 315 | 3, 10, |
| 316 | 4, 10, |
| 317 | 5, 10, |
| 318 | 6, 10, |
| 319 | 7, 10, |
| 320 | /* The order of the next 7 registers must be consistent |
| 321 | with their numbering in config/i386/tm-go32.h, which see. */ |
| 322 | 0, 2, /* control word, from npx */ |
| 323 | 4, 2, /* status word, from npx */ |
| 324 | 8, 2, /* tag word, from npx */ |
| 325 | 16, 2, /* last FP exception CS from npx */ |
| 326 | 24, 2, /* last FP exception operand selector from npx */ |
| 327 | 12, 4, /* last FP exception EIP from npx */ |
| 328 | 20, 4 /* last FP exception operand offset from npx */ |
| 329 | }; |
| 330 | |
| 331 | static struct |
| 332 | { |
| 333 | int go32_sig; |
| 334 | int gdb_sig; |
| 335 | } |
| 336 | sig_map[] = |
| 337 | { |
| 338 | 0, TARGET_SIGNAL_FPE, |
| 339 | 1, TARGET_SIGNAL_TRAP, |
| 340 | /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL, |
| 341 | but I think SIGBUS is better, since the NMI is usually activated |
| 342 | as a result of a memory parity check failure. */ |
| 343 | 2, TARGET_SIGNAL_BUS, |
| 344 | 3, TARGET_SIGNAL_TRAP, |
| 345 | 4, TARGET_SIGNAL_FPE, |
| 346 | 5, TARGET_SIGNAL_SEGV, |
| 347 | 6, TARGET_SIGNAL_ILL, |
| 348 | 7, TARGET_SIGNAL_EMT, /* no-coprocessor exception */ |
| 349 | 8, TARGET_SIGNAL_SEGV, |
| 350 | 9, TARGET_SIGNAL_SEGV, |
| 351 | 10, TARGET_SIGNAL_BUS, |
| 352 | 11, TARGET_SIGNAL_SEGV, |
| 353 | 12, TARGET_SIGNAL_SEGV, |
| 354 | 13, TARGET_SIGNAL_SEGV, |
| 355 | 14, TARGET_SIGNAL_SEGV, |
| 356 | 16, TARGET_SIGNAL_FPE, |
| 357 | 17, TARGET_SIGNAL_BUS, |
| 358 | 31, TARGET_SIGNAL_ILL, |
| 359 | 0x1b, TARGET_SIGNAL_INT, |
| 360 | 0x75, TARGET_SIGNAL_FPE, |
| 361 | 0x78, TARGET_SIGNAL_ALRM, |
| 362 | 0x79, TARGET_SIGNAL_INT, |
| 363 | 0x7a, TARGET_SIGNAL_QUIT, |
| 364 | -1, -1 |
| 365 | }; |
| 366 | |
| 367 | static struct { |
| 368 | enum target_signal gdb_sig; |
| 369 | int djgpp_excepno; |
| 370 | } excepn_map[] = { |
| 371 | TARGET_SIGNAL_0, -1, |
| 372 | TARGET_SIGNAL_ILL, 6, /* Invalid Opcode */ |
| 373 | TARGET_SIGNAL_EMT, 7, /* triggers SIGNOFP */ |
| 374 | TARGET_SIGNAL_SEGV, 13, /* GPF */ |
| 375 | TARGET_SIGNAL_BUS, 17, /* Alignment Check */ |
| 376 | /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for |
| 377 | details. */ |
| 378 | TARGET_SIGNAL_TERM, 0x1b, /* triggers Ctrl-Break type of SIGINT */ |
| 379 | TARGET_SIGNAL_FPE, 0x75, |
| 380 | TARGET_SIGNAL_INT, 0x79, |
| 381 | TARGET_SIGNAL_QUIT, 0x7a, |
| 382 | TARGET_SIGNAL_ALRM, 0x78, /* triggers SIGTIMR */ |
| 383 | TARGET_SIGNAL_PROF, 0x78, |
| 384 | -1, -1 |
| 385 | }; |
| 386 | |
| 387 | static void |
| 388 | go32_open (char *name, int from_tty) |
| 389 | { |
| 390 | printf_unfiltered ("Done. Use the \"run\" command to run the program.\n"); |
| 391 | } |
| 392 | |
| 393 | static void |
| 394 | go32_close (int quitting) |
| 395 | { |
| 396 | } |
| 397 | |
| 398 | static void |
| 399 | go32_attach (char *args, int from_tty) |
| 400 | { |
| 401 | error ("\ |
| 402 | You cannot attach to a running program on this platform.\n\ |
| 403 | Use the `run' command to run DJGPP programs."); |
| 404 | } |
| 405 | |
| 406 | static void |
| 407 | go32_detach (char *args, int from_tty) |
| 408 | { |
| 409 | } |
| 410 | |
| 411 | static int resume_is_step; |
| 412 | static int resume_signal = -1; |
| 413 | |
| 414 | static void |
| 415 | go32_resume (int pid, int step, enum target_signal siggnal) |
| 416 | { |
| 417 | int i; |
| 418 | |
| 419 | resume_is_step = step; |
| 420 | |
| 421 | if (siggnal != TARGET_SIGNAL_0 && siggnal != TARGET_SIGNAL_TRAP) |
| 422 | { |
| 423 | for (i = 0, resume_signal = -1; excepn_map[i].gdb_sig != -1; i++) |
| 424 | if (excepn_map[i].gdb_sig == siggnal) |
| 425 | { |
| 426 | resume_signal = excepn_map[i].djgpp_excepno; |
| 427 | break; |
| 428 | } |
| 429 | if (resume_signal == -1) |
| 430 | printf_unfiltered ("Cannot deliver signal %s on this platform.\n", |
| 431 | target_signal_to_name (siggnal)); |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | static char child_cwd[FILENAME_MAX]; |
| 436 | |
| 437 | static int |
| 438 | go32_wait (int pid, struct target_waitstatus *status) |
| 439 | { |
| 440 | int i; |
| 441 | unsigned char saved_opcode; |
| 442 | unsigned long INT3_addr; |
| 443 | int stepping_over_INT = 0; |
| 444 | |
| 445 | a_tss.tss_eflags &= 0xfeff; /* reset the single-step flag (TF) */ |
| 446 | if (resume_is_step) |
| 447 | { |
| 448 | /* If the next instruction is INT xx or INTO, we need to handle |
| 449 | them specially. Intel manuals say that these instructions |
| 450 | reset the single-step flag (a.k.a. TF). However, it seems |
| 451 | that, at least in the DPMI environment, and at least when |
| 452 | stepping over the DPMI interrupt 31h, the problem is having |
| 453 | TF set at all when INT 31h is executed: the debuggee either |
| 454 | crashes (and takes the system with it) or is killed by a |
| 455 | SIGTRAP. |
| 456 | |
| 457 | So we need to emulate single-step mode: we put an INT3 opcode |
| 458 | right after the INT xx instruction, let the debuggee run |
| 459 | until it hits INT3 and stops, then restore the original |
| 460 | instruction which we overwrote with the INT3 opcode, and back |
| 461 | up the debuggee's EIP to that instruction. */ |
| 462 | read_child (a_tss.tss_eip, &saved_opcode, 1); |
| 463 | if (saved_opcode == 0xCD || saved_opcode == 0xCE) |
| 464 | { |
| 465 | unsigned char INT3_opcode = 0xCC; |
| 466 | |
| 467 | INT3_addr |
| 468 | = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1; |
| 469 | stepping_over_INT = 1; |
| 470 | read_child (INT3_addr, &saved_opcode, 1); |
| 471 | write_child (INT3_addr, &INT3_opcode, 1); |
| 472 | } |
| 473 | else |
| 474 | a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */ |
| 475 | } |
| 476 | |
| 477 | /* The special value FFFFh in tss_trap indicates to run_child that |
| 478 | tss_irqn holds a signal to be delivered to the debuggee. */ |
| 479 | if (resume_signal <= -1) |
| 480 | { |
| 481 | a_tss.tss_trap = 0; |
| 482 | a_tss.tss_irqn = 0xff; |
| 483 | } |
| 484 | else |
| 485 | { |
| 486 | a_tss.tss_trap = 0xffff; /* run_child looks for this */ |
| 487 | a_tss.tss_irqn = resume_signal; |
| 488 | } |
| 489 | |
| 490 | /* The child might change working directory behind our back. The |
| 491 | GDB users won't like the side effects of that when they work with |
| 492 | relative file names, and GDB might be confused by its current |
| 493 | directory not being in sync with the truth. So we always make a |
| 494 | point of changing back to where GDB thinks is its cwd, when we |
| 495 | return control to the debugger, but restore child's cwd before we |
| 496 | run it. */ |
| 497 | chdir (child_cwd); |
| 498 | |
| 499 | #if __DJGPP_MINOR__ < 3 |
| 500 | load_npx (); |
| 501 | #endif |
| 502 | run_child (); |
| 503 | #if __DJGPP_MINOR__ < 3 |
| 504 | save_npx (); |
| 505 | #endif |
| 506 | |
| 507 | /* Did we step over an INT xx instruction? */ |
| 508 | if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1) |
| 509 | { |
| 510 | /* Restore the original opcode. */ |
| 511 | a_tss.tss_eip--; /* EIP points *after* the INT3 instruction */ |
| 512 | write_child (a_tss.tss_eip, &saved_opcode, 1); |
| 513 | /* Simulate a TRAP exception. */ |
| 514 | a_tss.tss_irqn = 1; |
| 515 | a_tss.tss_eflags |= 0x0100; |
| 516 | } |
| 517 | |
| 518 | getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */ |
| 519 | chdir (current_directory); |
| 520 | |
| 521 | if (a_tss.tss_irqn == 0x21) |
| 522 | { |
| 523 | status->kind = TARGET_WAITKIND_EXITED; |
| 524 | status->value.integer = a_tss.tss_eax & 0xff; |
| 525 | } |
| 526 | else |
| 527 | { |
| 528 | status->value.sig = TARGET_SIGNAL_UNKNOWN; |
| 529 | status->kind = TARGET_WAITKIND_STOPPED; |
| 530 | for (i = 0; sig_map[i].go32_sig != -1; i++) |
| 531 | { |
| 532 | if (a_tss.tss_irqn == sig_map[i].go32_sig) |
| 533 | { |
| 534 | #if __DJGPP_MINOR__ < 3 |
| 535 | if ((status->value.sig = sig_map[i].gdb_sig) != |
| 536 | TARGET_SIGNAL_TRAP) |
| 537 | status->kind = TARGET_WAITKIND_SIGNALLED; |
| 538 | #else |
| 539 | status->value.sig = sig_map[i].gdb_sig; |
| 540 | #endif |
| 541 | break; |
| 542 | } |
| 543 | } |
| 544 | } |
| 545 | return SOME_PID; |
| 546 | } |
| 547 | |
| 548 | static void |
| 549 | go32_fetch_registers (int regno) |
| 550 | { |
| 551 | /*JHW */ |
| 552 | int end_reg = regno + 1; /* just one reg initially */ |
| 553 | |
| 554 | if (regno < 0) /* do the all registers */ |
| 555 | { |
| 556 | regno = 0; /* start at first register */ |
| 557 | /* # regs in table */ |
| 558 | end_reg = sizeof (regno_mapping) / sizeof (regno_mapping[0]); |
| 559 | } |
| 560 | |
| 561 | for (; regno < end_reg; regno++) |
| 562 | { |
| 563 | if (regno < 16) |
| 564 | supply_register (regno, |
| 565 | (char *) &a_tss + regno_mapping[regno].tss_ofs); |
| 566 | else if (regno < 24) |
| 567 | supply_register (regno, |
| 568 | (char *) &npx.reg[regno_mapping[regno].tss_ofs]); |
| 569 | else if (regno < 31) |
| 570 | supply_register (regno, |
| 571 | (char *) &npx + regno_mapping[regno].tss_ofs); |
| 572 | else |
| 573 | internal_error ("Invalid register no. %d in go32_fetch_register.", |
| 574 | regno); |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | static void |
| 579 | store_register (int regno) |
| 580 | { |
| 581 | void *rp; |
| 582 | void *v = (void *) ®isters[REGISTER_BYTE (regno)]; |
| 583 | |
| 584 | if (regno < 16) |
| 585 | rp = (char *) &a_tss + regno_mapping[regno].tss_ofs; |
| 586 | else if (regno < 24) |
| 587 | rp = (char *) &npx.reg[regno_mapping[regno].tss_ofs]; |
| 588 | else if (regno < 31) |
| 589 | rp = (char *) &npx + regno_mapping[regno].tss_ofs; |
| 590 | else |
| 591 | internal_error ("Invalid register no. %d in store_register.", regno); |
| 592 | memcpy (rp, v, regno_mapping[regno].size); |
| 593 | } |
| 594 | |
| 595 | static void |
| 596 | go32_store_registers (int regno) |
| 597 | { |
| 598 | int r; |
| 599 | |
| 600 | if (regno >= 0) |
| 601 | store_register (regno); |
| 602 | else |
| 603 | { |
| 604 | for (r = 0; r < sizeof (regno_mapping) / sizeof (regno_mapping[0]); r++) |
| 605 | store_register (r); |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | static void |
| 610 | go32_prepare_to_store (void) |
| 611 | { |
| 612 | } |
| 613 | |
| 614 | static int |
| 615 | go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
| 616 | struct target_ops *target) |
| 617 | { |
| 618 | if (write) |
| 619 | { |
| 620 | if (write_child (memaddr, myaddr, len)) |
| 621 | { |
| 622 | return 0; |
| 623 | } |
| 624 | else |
| 625 | { |
| 626 | return len; |
| 627 | } |
| 628 | } |
| 629 | else |
| 630 | { |
| 631 | if (read_child (memaddr, myaddr, len)) |
| 632 | { |
| 633 | return 0; |
| 634 | } |
| 635 | else |
| 636 | { |
| 637 | return len; |
| 638 | } |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | static cmdline_t child_cmd; /* parsed child's command line kept here */ |
| 643 | |
| 644 | static void |
| 645 | go32_files_info (struct target_ops *target) |
| 646 | { |
| 647 | printf_unfiltered ("You are running a DJGPP V2 program.\n"); |
| 648 | } |
| 649 | |
| 650 | static void |
| 651 | go32_stop (void) |
| 652 | { |
| 653 | normal_stop (); |
| 654 | cleanup_client (); |
| 655 | inferior_pid = 0; |
| 656 | prog_has_started = 0; |
| 657 | } |
| 658 | |
| 659 | static void |
| 660 | go32_kill_inferior (void) |
| 661 | { |
| 662 | redir_cmdline_delete (&child_cmd); |
| 663 | resume_signal = -1; |
| 664 | resume_is_step = 0; |
| 665 | unpush_target (&go32_ops); |
| 666 | } |
| 667 | |
| 668 | static void |
| 669 | go32_create_inferior (char *exec_file, char *args, char **env) |
| 670 | { |
| 671 | jmp_buf start_state; |
| 672 | char *cmdline; |
| 673 | char **env_save = environ; |
| 674 | |
| 675 | if (prog_has_started) |
| 676 | { |
| 677 | go32_stop (); |
| 678 | go32_kill_inferior (); |
| 679 | } |
| 680 | resume_signal = -1; |
| 681 | resume_is_step = 0; |
| 682 | /* Init command line storage. */ |
| 683 | if (redir_debug_init (&child_cmd) == -1) |
| 684 | internal_error ("Cannot allocate redirection storage: not enough memory.\n"); |
| 685 | |
| 686 | /* Parse the command line and create redirections. */ |
| 687 | if (strpbrk (args, "<>")) |
| 688 | { |
| 689 | if (redir_cmdline_parse (args, &child_cmd) == 0) |
| 690 | args = child_cmd.command; |
| 691 | else |
| 692 | error ("Syntax error in command line."); |
| 693 | } |
| 694 | else |
| 695 | child_cmd.command = xstrdup (args); |
| 696 | |
| 697 | cmdline = (char *) alloca (strlen (args) + 4); |
| 698 | cmdline[0] = strlen (args); |
| 699 | strcpy (cmdline + 1, args); |
| 700 | cmdline[strlen (args) + 1] = 13; |
| 701 | |
| 702 | environ = env; |
| 703 | |
| 704 | if (v2loadimage (exec_file, cmdline, start_state)) |
| 705 | { |
| 706 | environ = env_save; |
| 707 | printf_unfiltered ("Load failed for image %s\n", exec_file); |
| 708 | exit (1); |
| 709 | } |
| 710 | environ = env_save; |
| 711 | |
| 712 | edi_init (start_state); |
| 713 | #if __DJGPP_MINOR__ < 3 |
| 714 | save_npx (); |
| 715 | #endif |
| 716 | |
| 717 | inferior_pid = SOME_PID; |
| 718 | push_target (&go32_ops); |
| 719 | clear_proceed_status (); |
| 720 | insert_breakpoints (); |
| 721 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); |
| 722 | prog_has_started = 1; |
| 723 | } |
| 724 | |
| 725 | static void |
| 726 | go32_mourn_inferior (void) |
| 727 | { |
| 728 | /* We need to make sure all the breakpoint enable bits in the DR7 |
| 729 | register are reset when the inferior exits. Otherwise, if they |
| 730 | rerun the inferior, the uncleared bits may cause random SIGTRAPs, |
| 731 | failure to set more watchpoints, and other calamities. It would |
| 732 | be nice if GDB itself would take care to remove all breakpoints |
| 733 | at all times, but it doesn't, probably under an assumption that |
| 734 | the OS cleans up when the debuggee exits. */ |
| 735 | cleanup_dregs (); |
| 736 | go32_kill_inferior (); |
| 737 | generic_mourn_inferior (); |
| 738 | } |
| 739 | |
| 740 | static int |
| 741 | go32_can_run (void) |
| 742 | { |
| 743 | return 1; |
| 744 | } |
| 745 | |
| 746 | static void |
| 747 | ignore (void) |
| 748 | { |
| 749 | } |
| 750 | |
| 751 | /* Hardware watchpoint support. */ |
| 752 | |
| 753 | #define DR_STATUS 6 |
| 754 | #define DR_CONTROL 7 |
| 755 | #define DR_ENABLE_SIZE 2 |
| 756 | #define DR_LOCAL_ENABLE_SHIFT 0 |
| 757 | #define DR_GLOBAL_ENABLE_SHIFT 1 |
| 758 | #define DR_LOCAL_SLOWDOWN 0x100 |
| 759 | #define DR_GLOBAL_SLOWDOWN 0x200 |
| 760 | #define DR_CONTROL_SHIFT 16 |
| 761 | #define DR_CONTROL_SIZE 4 |
| 762 | #define DR_RW_READWRITE 0x3 |
| 763 | #define DR_RW_WRITE 0x1 |
| 764 | #define DR_CONTROL_MASK 0xf |
| 765 | #define DR_ENABLE_MASK 0x3 |
| 766 | #define DR_LEN_1 0x0 |
| 767 | #define DR_LEN_2 0x4 |
| 768 | #define DR_LEN_4 0xc |
| 769 | |
| 770 | #define D_REGS edi.dr |
| 771 | #define CONTROL D_REGS[DR_CONTROL] |
| 772 | #define STATUS D_REGS[DR_STATUS] |
| 773 | |
| 774 | #define IS_REG_FREE(index) \ |
| 775 | (!(CONTROL & (3 << (DR_ENABLE_SIZE * (index))))) |
| 776 | |
| 777 | #define LOCAL_ENABLE_REG(index) \ |
| 778 | (CONTROL |= (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index)))) |
| 779 | |
| 780 | #define GLOBAL_ENABLE_REG(index) \ |
| 781 | (CONTROL |= (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index)))) |
| 782 | |
| 783 | #define DISABLE_REG(index) \ |
| 784 | (CONTROL &= ~(3 << (DR_ENABLE_SIZE * (index)))) |
| 785 | |
| 786 | #define SET_LOCAL_EXACT() \ |
| 787 | (CONTROL |= DR_LOCAL_SLOWDOWN) |
| 788 | |
| 789 | #define SET_GLOBAL_EXACT() \ |
| 790 | (CONTROL |= DR_GLOBAL_SLOWDOWN) |
| 791 | |
| 792 | #define RESET_LOCAL_EXACT() \ |
| 793 | (CONTROL &= ~(DR_LOCAL_SLOWDOWN)) |
| 794 | |
| 795 | #define RESET_GLOBAL_EXACT() \ |
| 796 | (CONTROL &= ~(DR_GLOBAL_SLOWDOWN)) |
| 797 | |
| 798 | #define SET_BREAK(index,address) \ |
| 799 | do {\ |
| 800 | CONTROL &= ~(DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index)));\ |
| 801 | D_REGS[index] = address;\ |
| 802 | dr_ref_count[index]++;\ |
| 803 | } while(0) |
| 804 | |
| 805 | #define SET_WATCH(index,address,rw,len) \ |
| 806 | do {\ |
| 807 | SET_BREAK(index,address);\ |
| 808 | CONTROL |= ((len)|(rw)) << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index));\ |
| 809 | } while (0) |
| 810 | |
| 811 | #define IS_WATCH(index) \ |
| 812 | (CONTROL & (DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE*(index)))) |
| 813 | |
| 814 | #define WATCH_HIT(index) ((STATUS & (1 << (index))) && IS_WATCH(index)) |
| 815 | |
| 816 | #define DR_DEF(index) \ |
| 817 | ((CONTROL >> (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index))) & 0x0f) |
| 818 | |
| 819 | |
| 820 | #if 0 /* use debugging macro */ |
| 821 | #define SHOW_DR(text,len) \ |
| 822 | do { \ |
| 823 | if (!getenv ("GDB_SHOW_DR")) break; \ |
| 824 | fprintf(stderr,"%08x %08x ",edi.dr[7],edi.dr[6]); \ |
| 825 | fprintf(stderr,"%08x %d %08x %d ", \ |
| 826 | edi.dr[0],dr_ref_count[0],edi.dr[1],dr_ref_count[1]); \ |
| 827 | fprintf(stderr,"%08x %d %08x %d ", \ |
| 828 | edi.dr[2],dr_ref_count[2],edi.dr[3],dr_ref_count[3]); \ |
| 829 | fprintf(stderr,(len)?"(%s:%d)\n":"(%s)\n",#text,len); \ |
| 830 | } while (0) |
| 831 | #else |
| 832 | #define SHOW_DR(text,len) do {} while (0) |
| 833 | #endif |
| 834 | |
| 835 | static void |
| 836 | cleanup_dregs (void) |
| 837 | { |
| 838 | int i; |
| 839 | |
| 840 | CONTROL = 0; |
| 841 | STATUS = 0; |
| 842 | for (i = 0; i < 4; i++) |
| 843 | { |
| 844 | D_REGS[i] = 0; |
| 845 | dr_ref_count[i] = 0; |
| 846 | } |
| 847 | } |
| 848 | |
| 849 | /* Insert a watchpoint. */ |
| 850 | |
| 851 | int |
| 852 | go32_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw) |
| 853 | { |
| 854 | int ret = go32_insert_aligned_watchpoint (addr, addr, len, rw); |
| 855 | |
| 856 | SHOW_DR (insert_watch, len); |
| 857 | return ret; |
| 858 | } |
| 859 | |
| 860 | static int |
| 861 | go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
| 862 | int len, int rw) |
| 863 | { |
| 864 | int i; |
| 865 | int read_write_bits, len_bits; |
| 866 | |
| 867 | /* Values of rw: 0 - write, 1 - read, 2 - access (read and write). |
| 868 | However, x86 doesn't support read-only data breakpoints. */ |
| 869 | read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE; |
| 870 | |
| 871 | switch (len) |
| 872 | { |
| 873 | case 4: |
| 874 | len_bits = DR_LEN_4; |
| 875 | break; |
| 876 | case 2: |
| 877 | len_bits = DR_LEN_2; |
| 878 | break; |
| 879 | case 1: |
| 880 | len_bits = DR_LEN_1; |
| 881 | break; |
| 882 | default: |
| 883 | /* The debug registers only have 2 bits for the length, so |
| 884 | so this value will always fail the loop below. */ |
| 885 | len_bits = 0x10; |
| 886 | } |
| 887 | |
| 888 | /* Look for an occupied debug register with the same address and the |
| 889 | same RW and LEN definitions. If we find one, we can use it for |
| 890 | this watchpoint as well (and save a register). */ |
| 891 | for (i = 0; i < 4; i++) |
| 892 | { |
| 893 | if (!IS_REG_FREE (i) && D_REGS[i] == addr |
| 894 | && DR_DEF (i) == (len_bits | read_write_bits)) |
| 895 | { |
| 896 | dr_ref_count[i]++; |
| 897 | return 0; |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | /* Look for a free debug register. */ |
| 902 | for (i = 0; i <= 3; i++) |
| 903 | { |
| 904 | if (IS_REG_FREE (i)) |
| 905 | break; |
| 906 | } |
| 907 | |
| 908 | /* No more debug registers! */ |
| 909 | if (i > 3) |
| 910 | return -1; |
| 911 | |
| 912 | if (len == 2) |
| 913 | { |
| 914 | if (addr % 2) |
| 915 | return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, |
| 916 | len, rw); |
| 917 | } |
| 918 | else if (len == 4) |
| 919 | { |
| 920 | if (addr % 4) |
| 921 | return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, |
| 922 | len, rw); |
| 923 | } |
| 924 | else if (len != 1) |
| 925 | return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, len, rw); |
| 926 | |
| 927 | SET_WATCH (i, addr, read_write_bits, len_bits); |
| 928 | LOCAL_ENABLE_REG (i); |
| 929 | SET_LOCAL_EXACT (); |
| 930 | SET_GLOBAL_EXACT (); |
| 931 | return 0; |
| 932 | } |
| 933 | |
| 934 | static int |
| 935 | go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr, CORE_ADDR addr, |
| 936 | int len, int rw) |
| 937 | { |
| 938 | int align; |
| 939 | int size; |
| 940 | int rv = 0, status = 0; |
| 941 | |
| 942 | static int size_try_array[16] = |
| 943 | { |
| 944 | 1, 1, 1, 1, /* trying size one */ |
| 945 | 2, 1, 2, 1, /* trying size two */ |
| 946 | 2, 1, 2, 1, /* trying size three */ |
| 947 | 4, 1, 2, 1 /* trying size four */ |
| 948 | }; |
| 949 | |
| 950 | while (len > 0) |
| 951 | { |
| 952 | align = addr % 4; |
| 953 | /* Four is the maximum length for 386. */ |
| 954 | size = (len > 4) ? 3 : len - 1; |
| 955 | size = size_try_array[size * 4 + align]; |
| 956 | if (what == wp_insert) |
| 957 | status = go32_insert_aligned_watchpoint (waddr, addr, size, rw); |
| 958 | else if (what == wp_remove) |
| 959 | status = go32_remove_aligned_watchpoint (waddr, addr, size, rw); |
| 960 | else if (what == wp_count) |
| 961 | rv++; |
| 962 | else |
| 963 | status = -1; |
| 964 | /* We keep the loop going even after a failure, because some of |
| 965 | the other aligned watchpoints might still succeed, e.g. if |
| 966 | they watch addresses that are already watched, and thus just |
| 967 | increment the reference counts of occupied debug registers. |
| 968 | If we break out of the loop too early, we could cause those |
| 969 | addresses watched by other watchpoints to be disabled when |
| 970 | GDB reacts to our failure to insert this watchpoint and tries |
| 971 | to remove it. */ |
| 972 | if (status) |
| 973 | rv = status; |
| 974 | addr += size; |
| 975 | len -= size; |
| 976 | } |
| 977 | return rv; |
| 978 | } |
| 979 | |
| 980 | /* Remove a watchpoint. */ |
| 981 | |
| 982 | int |
| 983 | go32_remove_watchpoint (int pid, CORE_ADDR addr, int len, int rw) |
| 984 | { |
| 985 | int ret = go32_remove_aligned_watchpoint (addr, addr, len, rw); |
| 986 | |
| 987 | SHOW_DR (remove_watch, len); |
| 988 | return ret; |
| 989 | } |
| 990 | |
| 991 | static int |
| 992 | go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
| 993 | int len, int rw) |
| 994 | { |
| 995 | int i; |
| 996 | int read_write_bits, len_bits; |
| 997 | |
| 998 | /* Values of rw: 0 - write, 1 - read, 2 - access (read and write). |
| 999 | However, x86 doesn't support read-only data breakpoints. */ |
| 1000 | read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE; |
| 1001 | |
| 1002 | switch (len) |
| 1003 | { |
| 1004 | case 4: |
| 1005 | len_bits = DR_LEN_4; |
| 1006 | break; |
| 1007 | case 2: |
| 1008 | len_bits = DR_LEN_2; |
| 1009 | break; |
| 1010 | case 1: |
| 1011 | len_bits = DR_LEN_1; |
| 1012 | break; |
| 1013 | default: |
| 1014 | /* The debug registers only have 2 bits for the length, so |
| 1015 | so this value will always fail the loop below. */ |
| 1016 | len_bits = 0x10; |
| 1017 | } |
| 1018 | |
| 1019 | if (len == 2) |
| 1020 | { |
| 1021 | if (addr % 2) |
| 1022 | return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, |
| 1023 | len, rw); |
| 1024 | } |
| 1025 | else if (len == 4) |
| 1026 | { |
| 1027 | if (addr % 4) |
| 1028 | return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, |
| 1029 | len, rw); |
| 1030 | } |
| 1031 | else if (len != 1) |
| 1032 | return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, len, rw); |
| 1033 | |
| 1034 | for (i = 0; i <= 3; i++) |
| 1035 | { |
| 1036 | if (!IS_REG_FREE (i) && D_REGS[i] == addr |
| 1037 | && DR_DEF (i) == (len_bits | read_write_bits)) |
| 1038 | { |
| 1039 | dr_ref_count[i]--; |
| 1040 | if (dr_ref_count[i] == 0) |
| 1041 | DISABLE_REG (i); |
| 1042 | } |
| 1043 | } |
| 1044 | RESET_LOCAL_EXACT (); |
| 1045 | RESET_GLOBAL_EXACT (); |
| 1046 | |
| 1047 | return 0; |
| 1048 | } |
| 1049 | |
| 1050 | /* Can we use debug registers to watch a region whose address is ADDR |
| 1051 | and whose length is LEN bytes? */ |
| 1052 | |
| 1053 | int |
| 1054 | go32_region_ok_for_watchpoint (CORE_ADDR addr, int len) |
| 1055 | { |
| 1056 | /* Compute how many aligned watchpoints we would need to cover this |
| 1057 | region. */ |
| 1058 | int nregs = go32_handle_nonaligned_watchpoint (wp_count, addr, addr, len, 0); |
| 1059 | |
| 1060 | return nregs <= 4 ? 1 : 0; |
| 1061 | } |
| 1062 | |
| 1063 | /* Check if stopped by a data watchpoint. If so, return the address |
| 1064 | whose access triggered the watchpoint. */ |
| 1065 | |
| 1066 | CORE_ADDR |
| 1067 | go32_stopped_by_watchpoint (int pid, int data_watchpoint) |
| 1068 | { |
| 1069 | int i, ret = 0; |
| 1070 | int status; |
| 1071 | |
| 1072 | status = edi.dr[DR_STATUS]; |
| 1073 | SHOW_DR (stopped_by, 0); |
| 1074 | for (i = 0; i <= 3; i++) |
| 1075 | { |
| 1076 | if (WATCH_HIT (i) && data_watchpoint) |
| 1077 | { |
| 1078 | SHOW_DR (WP_HIT, 0); |
| 1079 | ret = D_REGS[i]; |
| 1080 | } |
| 1081 | } |
| 1082 | |
| 1083 | return ret; |
| 1084 | } |
| 1085 | |
| 1086 | /* Remove a breakpoint. */ |
| 1087 | |
| 1088 | int |
| 1089 | go32_remove_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow) |
| 1090 | { |
| 1091 | int i; |
| 1092 | for (i = 0; i <= 3; i++) |
| 1093 | { |
| 1094 | if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0) |
| 1095 | { |
| 1096 | dr_ref_count[i]--; |
| 1097 | if (dr_ref_count[i] == 0) |
| 1098 | DISABLE_REG (i); |
| 1099 | } |
| 1100 | } |
| 1101 | SHOW_DR (remove_hw, 0); |
| 1102 | return 0; |
| 1103 | } |
| 1104 | |
| 1105 | int |
| 1106 | go32_insert_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow) |
| 1107 | { |
| 1108 | int i; |
| 1109 | int read_write_bits, len_bits; |
| 1110 | int free_debug_register; |
| 1111 | int register_number; |
| 1112 | |
| 1113 | /* Look for an occupied debug register with the same address and the |
| 1114 | same RW and LEN definitions. If we find one, we can use it for |
| 1115 | this breakpoint as well (and save a register). */ |
| 1116 | for (i = 0; i < 4; i++) |
| 1117 | { |
| 1118 | if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0) |
| 1119 | { |
| 1120 | dr_ref_count[i]++; |
| 1121 | SHOW_DR (insert_hw, 0); |
| 1122 | return 0; |
| 1123 | } |
| 1124 | } |
| 1125 | |
| 1126 | /* Look for a free debug register. */ |
| 1127 | for (i = 0; i <= 3; i++) |
| 1128 | { |
| 1129 | if (IS_REG_FREE (i)) |
| 1130 | break; |
| 1131 | } |
| 1132 | |
| 1133 | /* No more debug registers? */ |
| 1134 | if (i < 4) |
| 1135 | { |
| 1136 | SET_BREAK (i, addr); |
| 1137 | LOCAL_ENABLE_REG (i); |
| 1138 | } |
| 1139 | SHOW_DR (insert_hw, 0); |
| 1140 | |
| 1141 | return i < 4 ? 0 : -1; |
| 1142 | } |
| 1143 | |
| 1144 | /* Put the device open on handle FD into either raw or cooked |
| 1145 | mode, return 1 if it was in raw mode, zero otherwise. */ |
| 1146 | |
| 1147 | static int |
| 1148 | device_mode (int fd, int raw_p) |
| 1149 | { |
| 1150 | int oldmode, newmode; |
| 1151 | __dpmi_regs regs; |
| 1152 | |
| 1153 | regs.x.ax = 0x4400; |
| 1154 | regs.x.bx = fd; |
| 1155 | __dpmi_int (0x21, ®s); |
| 1156 | if (regs.x.flags & 1) |
| 1157 | return -1; |
| 1158 | newmode = oldmode = regs.x.dx; |
| 1159 | |
| 1160 | if (raw_p) |
| 1161 | newmode |= 0x20; |
| 1162 | else |
| 1163 | newmode &= ~0x20; |
| 1164 | |
| 1165 | if (oldmode & 0x80) /* Only for character dev */ |
| 1166 | { |
| 1167 | regs.x.ax = 0x4401; |
| 1168 | regs.x.bx = fd; |
| 1169 | regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails */ |
| 1170 | __dpmi_int (0x21, ®s); |
| 1171 | if (regs.x.flags & 1) |
| 1172 | return -1; |
| 1173 | } |
| 1174 | return (oldmode & 0x20) == 0x20; |
| 1175 | } |
| 1176 | |
| 1177 | |
| 1178 | static int inf_mode_valid = 0; |
| 1179 | static int inf_terminal_mode; |
| 1180 | |
| 1181 | /* This semaphore is needed because, amazingly enough, GDB calls |
| 1182 | target.to_terminal_ours more than once after the inferior stops. |
| 1183 | But we need the information from the first call only, since the |
| 1184 | second call will always see GDB's own cooked terminal. */ |
| 1185 | static int terminal_is_ours = 1; |
| 1186 | |
| 1187 | static void |
| 1188 | go32_terminal_init (void) |
| 1189 | { |
| 1190 | inf_mode_valid = 0; /* reinitialize, in case they are restarting child */ |
| 1191 | terminal_is_ours = 1; |
| 1192 | } |
| 1193 | |
| 1194 | static void |
| 1195 | go32_terminal_info (char *args, int from_tty) |
| 1196 | { |
| 1197 | printf_unfiltered ("Inferior's terminal is in %s mode.\n", |
| 1198 | !inf_mode_valid |
| 1199 | ? "default" : inf_terminal_mode ? "raw" : "cooked"); |
| 1200 | |
| 1201 | #if __DJGPP_MINOR__ > 2 |
| 1202 | if (child_cmd.redirection) |
| 1203 | { |
| 1204 | int i; |
| 1205 | |
| 1206 | for (i = 0; i < DBG_HANDLES; i++) |
| 1207 | { |
| 1208 | if (child_cmd.redirection[i]->file_name) |
| 1209 | printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n", |
| 1210 | i, child_cmd.redirection[i]->file_name); |
| 1211 | else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1) |
| 1212 | printf_unfiltered |
| 1213 | ("\tFile handle %d appears to be closed by inferior.\n", i); |
| 1214 | /* Mask off the raw/cooked bit when comparing device info words. */ |
| 1215 | else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf) |
| 1216 | != (_get_dev_info (i) & 0xdf)) |
| 1217 | printf_unfiltered |
| 1218 | ("\tFile handle %d appears to be redirected by inferior.\n", i); |
| 1219 | } |
| 1220 | } |
| 1221 | #endif |
| 1222 | } |
| 1223 | |
| 1224 | static void |
| 1225 | go32_terminal_inferior (void) |
| 1226 | { |
| 1227 | /* Redirect standard handles as child wants them. */ |
| 1228 | errno = 0; |
| 1229 | if (redir_to_child (&child_cmd) == -1) |
| 1230 | { |
| 1231 | redir_to_debugger (&child_cmd); |
| 1232 | error ("Cannot redirect standard handles for program: %s.", |
| 1233 | strerror (errno)); |
| 1234 | } |
| 1235 | /* set the console device of the inferior to whatever mode |
| 1236 | (raw or cooked) we found it last time */ |
| 1237 | if (terminal_is_ours) |
| 1238 | { |
| 1239 | if (inf_mode_valid) |
| 1240 | device_mode (0, inf_terminal_mode); |
| 1241 | terminal_is_ours = 0; |
| 1242 | } |
| 1243 | } |
| 1244 | |
| 1245 | static void |
| 1246 | go32_terminal_ours (void) |
| 1247 | { |
| 1248 | /* Switch to cooked mode on the gdb terminal and save the inferior |
| 1249 | terminal mode to be restored when it is resumed */ |
| 1250 | if (!terminal_is_ours) |
| 1251 | { |
| 1252 | inf_terminal_mode = device_mode (0, 0); |
| 1253 | if (inf_terminal_mode != -1) |
| 1254 | inf_mode_valid = 1; |
| 1255 | else |
| 1256 | /* If device_mode returned -1, we don't know what happens with |
| 1257 | handle 0 anymore, so make the info invalid. */ |
| 1258 | inf_mode_valid = 0; |
| 1259 | terminal_is_ours = 1; |
| 1260 | |
| 1261 | /* Restore debugger's standard handles. */ |
| 1262 | errno = 0; |
| 1263 | if (redir_to_debugger (&child_cmd) == -1) |
| 1264 | { |
| 1265 | redir_to_child (&child_cmd); |
| 1266 | error ("Cannot redirect standard handles for debugger: %s.", |
| 1267 | strerror (errno)); |
| 1268 | } |
| 1269 | } |
| 1270 | } |
| 1271 | |
| 1272 | static void |
| 1273 | init_go32_ops (void) |
| 1274 | { |
| 1275 | go32_ops.to_shortname = "djgpp"; |
| 1276 | go32_ops.to_longname = "djgpp target process"; |
| 1277 | go32_ops.to_doc = |
| 1278 | "Program loaded by djgpp, when gdb is used as an external debugger"; |
| 1279 | go32_ops.to_open = go32_open; |
| 1280 | go32_ops.to_close = go32_close; |
| 1281 | go32_ops.to_attach = go32_attach; |
| 1282 | go32_ops.to_detach = go32_detach; |
| 1283 | go32_ops.to_resume = go32_resume; |
| 1284 | go32_ops.to_wait = go32_wait; |
| 1285 | go32_ops.to_fetch_registers = go32_fetch_registers; |
| 1286 | go32_ops.to_store_registers = go32_store_registers; |
| 1287 | go32_ops.to_prepare_to_store = go32_prepare_to_store; |
| 1288 | go32_ops.to_xfer_memory = go32_xfer_memory; |
| 1289 | go32_ops.to_files_info = go32_files_info; |
| 1290 | go32_ops.to_insert_breakpoint = memory_insert_breakpoint; |
| 1291 | go32_ops.to_remove_breakpoint = memory_remove_breakpoint; |
| 1292 | go32_ops.to_terminal_init = go32_terminal_init; |
| 1293 | go32_ops.to_terminal_inferior = go32_terminal_inferior; |
| 1294 | go32_ops.to_terminal_ours_for_output = go32_terminal_ours; |
| 1295 | go32_ops.to_terminal_ours = go32_terminal_ours; |
| 1296 | go32_ops.to_terminal_info = go32_terminal_info; |
| 1297 | go32_ops.to_kill = go32_kill_inferior; |
| 1298 | go32_ops.to_create_inferior = go32_create_inferior; |
| 1299 | go32_ops.to_mourn_inferior = go32_mourn_inferior; |
| 1300 | go32_ops.to_can_run = go32_can_run; |
| 1301 | go32_ops.to_stop = go32_stop; |
| 1302 | go32_ops.to_stratum = process_stratum; |
| 1303 | go32_ops.to_has_all_memory = 1; |
| 1304 | go32_ops.to_has_memory = 1; |
| 1305 | go32_ops.to_has_stack = 1; |
| 1306 | go32_ops.to_has_registers = 1; |
| 1307 | go32_ops.to_has_execution = 1; |
| 1308 | go32_ops.to_magic = OPS_MAGIC; |
| 1309 | |
| 1310 | /* Initialize child's cwd with the current one. */ |
| 1311 | getcwd (child_cwd, sizeof (child_cwd)); |
| 1312 | |
| 1313 | /* Initialize child's command line storage. */ |
| 1314 | if (redir_debug_init (&child_cmd) == -1) |
| 1315 | internal_error ("Cannot allocate redirection storage: not enough memory.\n"); |
| 1316 | } |
| 1317 | |
| 1318 | void |
| 1319 | _initialize_go32_nat (void) |
| 1320 | { |
| 1321 | init_go32_ops (); |
| 1322 | add_target (&go32_ops); |
| 1323 | } |
| 1324 | |
| 1325 | pid_t |
| 1326 | tcgetpgrp (int fd) |
| 1327 | { |
| 1328 | if (isatty (fd)) |
| 1329 | return SOME_PID; |
| 1330 | errno = ENOTTY; |
| 1331 | return -1; |
| 1332 | } |
| 1333 | |
| 1334 | int |
| 1335 | tcsetpgrp (int fd, pid_t pgid) |
| 1336 | { |
| 1337 | if (isatty (fd) && pgid == SOME_PID) |
| 1338 | return 0; |
| 1339 | errno = pgid == SOME_PID ? ENOTTY : ENOSYS; |
| 1340 | return -1; |
| 1341 | } |