Commit | Line | Data |
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e49d4fa6 | 1 | /* Native debugging support for Intel x86 running DJGPP. |
e24d4c64 | 2 | Copyright 1997, 1999, 2000, 2001 Free Software Foundation, Inc. |
e49d4fa6 SS |
3 | Written by Robert Hoehne. |
4 | ||
c5aa993b | 5 | This file is part of GDB. |
e49d4fa6 | 6 | |
c5aa993b JM |
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. | |
e49d4fa6 | 11 | |
c5aa993b JM |
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. | |
e49d4fa6 | 16 | |
c5aa993b JM |
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. */ | |
e49d4fa6 SS |
21 | |
22 | #include <fcntl.h> | |
23 | ||
24 | #include "defs.h" | |
e49d4fa6 | 25 | #include "inferior.h" |
03f2053f | 26 | #include "gdb_wait.h" |
e49d4fa6 SS |
27 | #include "gdbcore.h" |
28 | #include "command.h" | |
d8c852a1 | 29 | #include "gdbcmd.h" |
e49d4fa6 | 30 | #include "floatformat.h" |
0fff5247 | 31 | #include "buildsym.h" |
89dea5aa | 32 | #include "i387-nat.h" |
4d277981 | 33 | #include "value.h" |
4e052eda | 34 | #include "regcache.h" |
4d277981 | 35 | #include "gdb_string.h" |
e49d4fa6 | 36 | |
10ba702d | 37 | #include <stdio.h> /* might be required for __DJGPP_MINOR__ */ |
e49d4fa6 | 38 | #include <stdlib.h> |
10ba702d | 39 | #include <ctype.h> |
53a5351d | 40 | #include <errno.h> |
c2c6d25f | 41 | #include <unistd.h> |
10ba702d | 42 | #include <sys/utsname.h> |
53a5351d | 43 | #include <io.h> |
10ba702d | 44 | #include <dos.h> |
53a5351d | 45 | #include <dpmi.h> |
10ba702d | 46 | #include <go32.h> |
9f20bf26 | 47 | #include <sys/farptr.h> |
e49d4fa6 SS |
48 | #include <debug/v2load.h> |
49 | #include <debug/dbgcom.h> | |
53a5351d JM |
50 | #if __DJGPP_MINOR__ > 2 |
51 | #include <debug/redir.h> | |
52 | #endif | |
e49d4fa6 | 53 | |
b83266a0 SS |
54 | #if __DJGPP_MINOR__ < 3 |
55 | /* This code will be provided from DJGPP 2.03 on. Until then I code it | |
56 | here */ | |
c5aa993b JM |
57 | typedef struct |
58 | { | |
59 | unsigned short sig0; | |
60 | unsigned short sig1; | |
61 | unsigned short sig2; | |
62 | unsigned short sig3; | |
63 | unsigned short exponent:15; | |
64 | unsigned short sign:1; | |
65 | } | |
66 | NPXREG; | |
67 | ||
68 | typedef struct | |
69 | { | |
70 | unsigned int control; | |
71 | unsigned int status; | |
72 | unsigned int tag; | |
73 | unsigned int eip; | |
74 | unsigned int cs; | |
75 | unsigned int dataptr; | |
76 | unsigned int datasel; | |
77 | NPXREG reg[8]; | |
78 | } | |
79 | NPX; | |
b83266a0 SS |
80 | |
81 | static NPX npx; | |
82 | ||
c5aa993b JM |
83 | static void save_npx (void); /* Save the FPU of the debugged program */ |
84 | static void load_npx (void); /* Restore the FPU of the debugged program */ | |
b83266a0 SS |
85 | |
86 | /* ------------------------------------------------------------------------- */ | |
87 | /* Store the contents of the NPX in the global variable `npx'. */ | |
c5aa993b | 88 | /* *INDENT-OFF* */ |
b83266a0 SS |
89 | |
90 | static void | |
91 | save_npx (void) | |
92 | { | |
1f5dc670 EZ |
93 | asm ("inb $0xa0, %%al \n\ |
94 | testb $0x20, %%al \n\ | |
95 | jz 1f \n\ | |
82cc5033 EZ |
96 | xorb %%al, %%al \n\ |
97 | outb %%al, $0xf0 \n\ | |
1f5dc670 | 98 | movb $0x20, %%al \n\ |
82cc5033 EZ |
99 | outb %%al, $0xa0 \n\ |
100 | outb %%al, $0x20 \n\ | |
1f5dc670 | 101 | 1: \n\ |
82cc5033 | 102 | fnsave %0 \n\ |
c5aa993b JM |
103 | fwait " |
104 | : "=m" (npx) | |
105 | : /* No input */ | |
106 | : "%eax"); | |
b83266a0 | 107 | } |
c5aa993b JM |
108 | |
109 | /* *INDENT-ON* */ | |
110 | ||
111 | ||
b83266a0 SS |
112 | /* ------------------------------------------------------------------------- */ |
113 | /* Reload the contents of the NPX from the global variable `npx'. */ | |
114 | ||
115 | static void | |
116 | load_npx (void) | |
117 | { | |
ba8629a9 | 118 | asm ("frstor %0":"=m" (npx)); |
b83266a0 | 119 | } |
53a5351d JM |
120 | /* ------------------------------------------------------------------------- */ |
121 | /* Stubs for the missing redirection functions. */ | |
122 | typedef struct { | |
123 | char *command; | |
124 | int redirected; | |
125 | } cmdline_t; | |
126 | ||
4d277981 | 127 | void |
ba8629a9 EZ |
128 | redir_cmdline_delete (cmdline_t *ptr) |
129 | { | |
130 | ptr->redirected = 0; | |
131 | } | |
4d277981 EZ |
132 | |
133 | int | |
134 | redir_cmdline_parse (const char *args, cmdline_t *ptr) | |
53a5351d JM |
135 | { |
136 | return -1; | |
137 | } | |
ba8629a9 | 138 | |
4d277981 EZ |
139 | int |
140 | redir_to_child (cmdline_t *ptr) | |
53a5351d JM |
141 | { |
142 | return 1; | |
143 | } | |
ba8629a9 | 144 | |
4d277981 EZ |
145 | int |
146 | redir_to_debugger (cmdline_t *ptr) | |
53a5351d JM |
147 | { |
148 | return 1; | |
149 | } | |
ba8629a9 | 150 | |
4d277981 | 151 | int |
ba8629a9 EZ |
152 | redir_debug_init (cmdline_t *ptr) |
153 | { | |
154 | return 0; | |
155 | } | |
b83266a0 SS |
156 | #endif /* __DJGPP_MINOR < 3 */ |
157 | ||
53a5351d JM |
158 | typedef enum { wp_insert, wp_remove, wp_count } wp_op; |
159 | ||
160 | /* This holds the current reference counts for each debug register. */ | |
161 | static int dr_ref_count[4]; | |
162 | ||
e49d4fa6 SS |
163 | #define SOME_PID 42 |
164 | ||
e49d4fa6 | 165 | static int prog_has_started = 0; |
c5aa993b JM |
166 | static void go32_open (char *name, int from_tty); |
167 | static void go32_close (int quitting); | |
168 | static void go32_attach (char *args, int from_tty); | |
169 | static void go32_detach (char *args, int from_tty); | |
39f77062 KB |
170 | static void go32_resume (ptid_t ptid, int step, |
171 | enum target_signal siggnal); | |
172 | static ptid_t go32_wait (ptid_t ptid, | |
173 | struct target_waitstatus *status); | |
c5aa993b JM |
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, | |
a17b5c4e EZ |
179 | int write, |
180 | struct mem_attrib *attrib, | |
181 | struct target_ops *target); | |
c5aa993b JM |
182 | static void go32_files_info (struct target_ops *target); |
183 | static void go32_stop (void); | |
184 | static void go32_kill_inferior (void); | |
185 | static void go32_create_inferior (char *exec_file, char *args, char **env); | |
186 | static void go32_mourn_inferior (void); | |
187 | static int go32_can_run (void); | |
b83266a0 SS |
188 | |
189 | static struct target_ops go32_ops; | |
c5aa993b JM |
190 | static void go32_terminal_init (void); |
191 | static void go32_terminal_inferior (void); | |
192 | static void go32_terminal_ours (void); | |
e49d4fa6 | 193 | |
53a5351d | 194 | #define r_ofs(x) (offsetof(TSS,x)) |
e49d4fa6 SS |
195 | |
196 | static struct | |
197 | { | |
53a5351d JM |
198 | size_t tss_ofs; |
199 | size_t size; | |
e49d4fa6 SS |
200 | } |
201 | regno_mapping[] = | |
202 | { | |
0fff5247 EZ |
203 | {r_ofs (tss_eax), 4}, /* normal registers, from a_tss */ |
204 | {r_ofs (tss_ecx), 4}, | |
205 | {r_ofs (tss_edx), 4}, | |
206 | {r_ofs (tss_ebx), 4}, | |
207 | {r_ofs (tss_esp), 4}, | |
208 | {r_ofs (tss_ebp), 4}, | |
209 | {r_ofs (tss_esi), 4}, | |
210 | {r_ofs (tss_edi), 4}, | |
211 | {r_ofs (tss_eip), 4}, | |
212 | {r_ofs (tss_eflags), 4}, | |
213 | {r_ofs (tss_cs), 2}, | |
214 | {r_ofs (tss_ss), 2}, | |
215 | {r_ofs (tss_ds), 2}, | |
216 | {r_ofs (tss_es), 2}, | |
217 | {r_ofs (tss_fs), 2}, | |
218 | {r_ofs (tss_gs), 2}, | |
219 | {0, 10}, /* 8 FP registers, from npx.reg[] */ | |
220 | {1, 10}, | |
221 | {2, 10}, | |
222 | {3, 10}, | |
223 | {4, 10}, | |
224 | {5, 10}, | |
225 | {6, 10}, | |
226 | {7, 10}, | |
53a5351d | 227 | /* The order of the next 7 registers must be consistent |
0fff5247 EZ |
228 | with their numbering in config/i386/tm-i386.h, which see. */ |
229 | {0, 2}, /* control word, from npx */ | |
230 | {4, 2}, /* status word, from npx */ | |
231 | {8, 2}, /* tag word, from npx */ | |
232 | {16, 2}, /* last FP exception CS from npx */ | |
233 | {12, 4}, /* last FP exception EIP from npx */ | |
234 | {24, 2}, /* last FP exception operand selector from npx */ | |
235 | {20, 4}, /* last FP exception operand offset from npx */ | |
236 | {18, 2} /* last FP opcode from npx */ | |
e49d4fa6 SS |
237 | }; |
238 | ||
239 | static struct | |
240 | { | |
241 | int go32_sig; | |
0fff5247 | 242 | enum target_signal gdb_sig; |
e49d4fa6 SS |
243 | } |
244 | sig_map[] = | |
245 | { | |
0fff5247 EZ |
246 | {0, TARGET_SIGNAL_FPE}, |
247 | {1, TARGET_SIGNAL_TRAP}, | |
53a5351d JM |
248 | /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL, |
249 | but I think SIGBUS is better, since the NMI is usually activated | |
250 | as a result of a memory parity check failure. */ | |
0fff5247 EZ |
251 | {2, TARGET_SIGNAL_BUS}, |
252 | {3, TARGET_SIGNAL_TRAP}, | |
253 | {4, TARGET_SIGNAL_FPE}, | |
254 | {5, TARGET_SIGNAL_SEGV}, | |
255 | {6, TARGET_SIGNAL_ILL}, | |
256 | {7, TARGET_SIGNAL_EMT}, /* no-coprocessor exception */ | |
257 | {8, TARGET_SIGNAL_SEGV}, | |
258 | {9, TARGET_SIGNAL_SEGV}, | |
259 | {10, TARGET_SIGNAL_BUS}, | |
260 | {11, TARGET_SIGNAL_SEGV}, | |
261 | {12, TARGET_SIGNAL_SEGV}, | |
262 | {13, TARGET_SIGNAL_SEGV}, | |
263 | {14, TARGET_SIGNAL_SEGV}, | |
264 | {16, TARGET_SIGNAL_FPE}, | |
265 | {17, TARGET_SIGNAL_BUS}, | |
266 | {31, TARGET_SIGNAL_ILL}, | |
267 | {0x1b, TARGET_SIGNAL_INT}, | |
268 | {0x75, TARGET_SIGNAL_FPE}, | |
269 | {0x78, TARGET_SIGNAL_ALRM}, | |
270 | {0x79, TARGET_SIGNAL_INT}, | |
271 | {0x7a, TARGET_SIGNAL_QUIT}, | |
272 | {-1, TARGET_SIGNAL_LAST} | |
e49d4fa6 SS |
273 | }; |
274 | ||
53a5351d JM |
275 | static struct { |
276 | enum target_signal gdb_sig; | |
277 | int djgpp_excepno; | |
278 | } excepn_map[] = { | |
0fff5247 EZ |
279 | {TARGET_SIGNAL_0, -1}, |
280 | {TARGET_SIGNAL_ILL, 6}, /* Invalid Opcode */ | |
281 | {TARGET_SIGNAL_EMT, 7}, /* triggers SIGNOFP */ | |
282 | {TARGET_SIGNAL_SEGV, 13}, /* GPF */ | |
283 | {TARGET_SIGNAL_BUS, 17}, /* Alignment Check */ | |
53a5351d JM |
284 | /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for |
285 | details. */ | |
0fff5247 EZ |
286 | {TARGET_SIGNAL_TERM, 0x1b}, /* triggers Ctrl-Break type of SIGINT */ |
287 | {TARGET_SIGNAL_FPE, 0x75}, | |
288 | {TARGET_SIGNAL_INT, 0x79}, | |
289 | {TARGET_SIGNAL_QUIT, 0x7a}, | |
290 | {TARGET_SIGNAL_ALRM, 0x78}, /* triggers SIGTIMR */ | |
291 | {TARGET_SIGNAL_PROF, 0x78}, | |
292 | {TARGET_SIGNAL_LAST, -1} | |
53a5351d JM |
293 | }; |
294 | ||
e49d4fa6 | 295 | static void |
4d277981 | 296 | go32_open (char *name, int from_tty) |
e49d4fa6 | 297 | { |
53a5351d | 298 | printf_unfiltered ("Done. Use the \"run\" command to run the program.\n"); |
e49d4fa6 SS |
299 | } |
300 | ||
301 | static void | |
4d277981 | 302 | go32_close (int quitting) |
e49d4fa6 SS |
303 | { |
304 | } | |
305 | ||
306 | static void | |
4d277981 | 307 | go32_attach (char *args, int from_tty) |
e49d4fa6 | 308 | { |
53a5351d JM |
309 | error ("\ |
310 | You cannot attach to a running program on this platform.\n\ | |
311 | Use the `run' command to run DJGPP programs."); | |
e49d4fa6 SS |
312 | } |
313 | ||
314 | static void | |
4d277981 | 315 | go32_detach (char *args, int from_tty) |
e49d4fa6 SS |
316 | { |
317 | } | |
318 | ||
319 | static int resume_is_step; | |
53a5351d | 320 | static int resume_signal = -1; |
e49d4fa6 SS |
321 | |
322 | static void | |
39f77062 | 323 | go32_resume (ptid_t ptid, int step, enum target_signal siggnal) |
c5aa993b | 324 | { |
53a5351d JM |
325 | int i; |
326 | ||
c5aa993b | 327 | resume_is_step = step; |
53a5351d JM |
328 | |
329 | if (siggnal != TARGET_SIGNAL_0 && siggnal != TARGET_SIGNAL_TRAP) | |
330 | { | |
0fff5247 EZ |
331 | for (i = 0, resume_signal = -1; |
332 | excepn_map[i].gdb_sig != TARGET_SIGNAL_LAST; i++) | |
53a5351d JM |
333 | if (excepn_map[i].gdb_sig == siggnal) |
334 | { | |
335 | resume_signal = excepn_map[i].djgpp_excepno; | |
336 | break; | |
337 | } | |
338 | if (resume_signal == -1) | |
339 | printf_unfiltered ("Cannot deliver signal %s on this platform.\n", | |
340 | target_signal_to_name (siggnal)); | |
341 | } | |
c5aa993b | 342 | } |
e49d4fa6 | 343 | |
53a5351d JM |
344 | static char child_cwd[FILENAME_MAX]; |
345 | ||
31616044 | 346 | static ptid_t |
39f77062 | 347 | go32_wait (ptid_t ptid, struct target_waitstatus *status) |
e49d4fa6 SS |
348 | { |
349 | int i; | |
53a5351d | 350 | unsigned char saved_opcode; |
0fff5247 | 351 | unsigned long INT3_addr = 0; |
53a5351d | 352 | int stepping_over_INT = 0; |
e49d4fa6 | 353 | |
53a5351d | 354 | a_tss.tss_eflags &= 0xfeff; /* reset the single-step flag (TF) */ |
e49d4fa6 | 355 | if (resume_is_step) |
53a5351d JM |
356 | { |
357 | /* If the next instruction is INT xx or INTO, we need to handle | |
358 | them specially. Intel manuals say that these instructions | |
359 | reset the single-step flag (a.k.a. TF). However, it seems | |
360 | that, at least in the DPMI environment, and at least when | |
361 | stepping over the DPMI interrupt 31h, the problem is having | |
362 | TF set at all when INT 31h is executed: the debuggee either | |
363 | crashes (and takes the system with it) or is killed by a | |
364 | SIGTRAP. | |
365 | ||
366 | So we need to emulate single-step mode: we put an INT3 opcode | |
367 | right after the INT xx instruction, let the debuggee run | |
368 | until it hits INT3 and stops, then restore the original | |
369 | instruction which we overwrote with the INT3 opcode, and back | |
370 | up the debuggee's EIP to that instruction. */ | |
371 | read_child (a_tss.tss_eip, &saved_opcode, 1); | |
372 | if (saved_opcode == 0xCD || saved_opcode == 0xCE) | |
373 | { | |
374 | unsigned char INT3_opcode = 0xCC; | |
375 | ||
376 | INT3_addr | |
377 | = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1; | |
378 | stepping_over_INT = 1; | |
379 | read_child (INT3_addr, &saved_opcode, 1); | |
380 | write_child (INT3_addr, &INT3_opcode, 1); | |
381 | } | |
382 | else | |
383 | a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */ | |
384 | } | |
385 | ||
386 | /* The special value FFFFh in tss_trap indicates to run_child that | |
387 | tss_irqn holds a signal to be delivered to the debuggee. */ | |
388 | if (resume_signal <= -1) | |
389 | { | |
390 | a_tss.tss_trap = 0; | |
391 | a_tss.tss_irqn = 0xff; | |
392 | } | |
e49d4fa6 | 393 | else |
53a5351d JM |
394 | { |
395 | a_tss.tss_trap = 0xffff; /* run_child looks for this */ | |
396 | a_tss.tss_irqn = resume_signal; | |
397 | } | |
398 | ||
399 | /* The child might change working directory behind our back. The | |
400 | GDB users won't like the side effects of that when they work with | |
401 | relative file names, and GDB might be confused by its current | |
402 | directory not being in sync with the truth. So we always make a | |
403 | point of changing back to where GDB thinks is its cwd, when we | |
404 | return control to the debugger, but restore child's cwd before we | |
405 | run it. */ | |
3a45aed8 EZ |
406 | /* Initialize child_cwd, before the first call to run_child and not |
407 | in the initialization, so the child get also the changed directory | |
408 | set with the gdb-command "cd ..." */ | |
409 | if (!*child_cwd) | |
410 | /* Initialize child's cwd with the current one. */ | |
411 | getcwd (child_cwd, sizeof (child_cwd)); | |
4d277981 | 412 | |
53a5351d | 413 | chdir (child_cwd); |
e49d4fa6 | 414 | |
b83266a0 | 415 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 416 | load_npx (); |
b83266a0 | 417 | #endif |
e49d4fa6 | 418 | run_child (); |
b83266a0 | 419 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 420 | save_npx (); |
b83266a0 | 421 | #endif |
e49d4fa6 | 422 | |
53a5351d JM |
423 | /* Did we step over an INT xx instruction? */ |
424 | if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1) | |
425 | { | |
426 | /* Restore the original opcode. */ | |
427 | a_tss.tss_eip--; /* EIP points *after* the INT3 instruction */ | |
428 | write_child (a_tss.tss_eip, &saved_opcode, 1); | |
429 | /* Simulate a TRAP exception. */ | |
430 | a_tss.tss_irqn = 1; | |
431 | a_tss.tss_eflags |= 0x0100; | |
432 | } | |
433 | ||
434 | getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */ | |
435 | chdir (current_directory); | |
436 | ||
e49d4fa6 SS |
437 | if (a_tss.tss_irqn == 0x21) |
438 | { | |
439 | status->kind = TARGET_WAITKIND_EXITED; | |
440 | status->value.integer = a_tss.tss_eax & 0xff; | |
441 | } | |
442 | else | |
443 | { | |
444 | status->value.sig = TARGET_SIGNAL_UNKNOWN; | |
445 | status->kind = TARGET_WAITKIND_STOPPED; | |
446 | for (i = 0; sig_map[i].go32_sig != -1; i++) | |
447 | { | |
448 | if (a_tss.tss_irqn == sig_map[i].go32_sig) | |
449 | { | |
53a5351d | 450 | #if __DJGPP_MINOR__ < 3 |
e49d4fa6 SS |
451 | if ((status->value.sig = sig_map[i].gdb_sig) != |
452 | TARGET_SIGNAL_TRAP) | |
453 | status->kind = TARGET_WAITKIND_SIGNALLED; | |
53a5351d JM |
454 | #else |
455 | status->value.sig = sig_map[i].gdb_sig; | |
456 | #endif | |
e49d4fa6 SS |
457 | break; |
458 | } | |
459 | } | |
460 | } | |
31616044 | 461 | return pid_to_ptid (SOME_PID); |
e49d4fa6 SS |
462 | } |
463 | ||
464 | static void | |
89dea5aa | 465 | fetch_register (int regno) |
e49d4fa6 | 466 | { |
89dea5aa EZ |
467 | if (regno < FP0_REGNUM) |
468 | supply_register (regno, (char *) &a_tss + regno_mapping[regno].tss_ofs); | |
469 | else if (regno <= LAST_FPU_CTRL_REGNUM) | |
470 | i387_supply_register (regno, (char *) &npx); | |
471 | else | |
472 | internal_error (__FILE__, __LINE__, | |
473 | "Invalid register no. %d in fetch_register.", regno); | |
474 | } | |
e49d4fa6 | 475 | |
89dea5aa EZ |
476 | static void |
477 | go32_fetch_registers (int regno) | |
478 | { | |
479 | if (regno >= 0) | |
480 | fetch_register (regno); | |
481 | else | |
e49d4fa6 | 482 | { |
89dea5aa EZ |
483 | for (regno = 0; regno < FP0_REGNUM; regno++) |
484 | fetch_register (regno); | |
485 | i387_supply_fsave ((char *) &npx); | |
e49d4fa6 SS |
486 | } |
487 | } | |
488 | ||
489 | static void | |
490 | store_register (int regno) | |
491 | { | |
89dea5aa | 492 | if (regno < FP0_REGNUM) |
284a190e | 493 | regcache_collect (regno, (void *) &a_tss + regno_mapping[regno].tss_ofs); |
89dea5aa EZ |
494 | else if (regno <= LAST_FPU_CTRL_REGNUM) |
495 | i387_fill_fsave ((char *)&npx, regno); | |
e49d4fa6 | 496 | else |
8e65ff28 AC |
497 | internal_error (__FILE__, __LINE__, |
498 | "Invalid register no. %d in store_register.", regno); | |
e49d4fa6 SS |
499 | } |
500 | ||
501 | static void | |
502 | go32_store_registers (int regno) | |
503 | { | |
0fff5247 | 504 | unsigned r; |
e49d4fa6 SS |
505 | |
506 | if (regno >= 0) | |
507 | store_register (regno); | |
508 | else | |
509 | { | |
89dea5aa | 510 | for (r = 0; r < FP0_REGNUM; r++) |
e49d4fa6 | 511 | store_register (r); |
89dea5aa | 512 | i387_fill_fsave ((char *) &npx, -1); |
e49d4fa6 SS |
513 | } |
514 | } | |
515 | ||
516 | static void | |
517 | go32_prepare_to_store (void) | |
518 | { | |
519 | } | |
520 | ||
521 | static int | |
522 | go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
4d277981 | 523 | struct mem_attrib *attrib, struct target_ops *target) |
e49d4fa6 SS |
524 | { |
525 | if (write) | |
526 | { | |
527 | if (write_child (memaddr, myaddr, len)) | |
528 | { | |
529 | return 0; | |
530 | } | |
531 | else | |
532 | { | |
533 | return len; | |
534 | } | |
535 | } | |
536 | else | |
537 | { | |
538 | if (read_child (memaddr, myaddr, len)) | |
539 | { | |
540 | return 0; | |
541 | } | |
542 | else | |
543 | { | |
544 | return len; | |
545 | } | |
546 | } | |
547 | } | |
548 | ||
53a5351d JM |
549 | static cmdline_t child_cmd; /* parsed child's command line kept here */ |
550 | ||
e49d4fa6 | 551 | static void |
4d277981 | 552 | go32_files_info (struct target_ops *target) |
e49d4fa6 | 553 | { |
53a5351d | 554 | printf_unfiltered ("You are running a DJGPP V2 program.\n"); |
e49d4fa6 SS |
555 | } |
556 | ||
557 | static void | |
558 | go32_stop (void) | |
559 | { | |
560 | normal_stop (); | |
561 | cleanup_client (); | |
39f77062 | 562 | inferior_ptid = null_ptid; |
e49d4fa6 SS |
563 | prog_has_started = 0; |
564 | } | |
565 | ||
566 | static void | |
567 | go32_kill_inferior (void) | |
568 | { | |
53a5351d JM |
569 | redir_cmdline_delete (&child_cmd); |
570 | resume_signal = -1; | |
571 | resume_is_step = 0; | |
e49d4fa6 SS |
572 | unpush_target (&go32_ops); |
573 | } | |
574 | ||
575 | static void | |
576 | go32_create_inferior (char *exec_file, char *args, char **env) | |
577 | { | |
4d277981 | 578 | extern char **environ; |
e49d4fa6 SS |
579 | jmp_buf start_state; |
580 | char *cmdline; | |
581 | char **env_save = environ; | |
150985e3 | 582 | size_t cmdlen; |
e49d4fa6 | 583 | |
0fff5247 EZ |
584 | /* If no exec file handed to us, get it from the exec-file command -- with |
585 | a good, common error message if none is specified. */ | |
586 | if (exec_file == 0) | |
587 | exec_file = get_exec_file (1); | |
588 | ||
e49d4fa6 SS |
589 | if (prog_has_started) |
590 | { | |
b83266a0 | 591 | go32_stop (); |
e49d4fa6 SS |
592 | go32_kill_inferior (); |
593 | } | |
53a5351d JM |
594 | resume_signal = -1; |
595 | resume_is_step = 0; | |
3a45aed8 EZ |
596 | |
597 | /* Initialize child's cwd as empty to be initialized when starting | |
598 | the child. */ | |
599 | *child_cwd = 0; | |
600 | ||
53a5351d JM |
601 | /* Init command line storage. */ |
602 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 AC |
603 | internal_error (__FILE__, __LINE__, |
604 | "Cannot allocate redirection storage: not enough memory.\n"); | |
53a5351d JM |
605 | |
606 | /* Parse the command line and create redirections. */ | |
607 | if (strpbrk (args, "<>")) | |
608 | { | |
609 | if (redir_cmdline_parse (args, &child_cmd) == 0) | |
610 | args = child_cmd.command; | |
611 | else | |
612 | error ("Syntax error in command line."); | |
613 | } | |
614 | else | |
c2d11a7d | 615 | child_cmd.command = xstrdup (args); |
e49d4fa6 | 616 | |
150985e3 EZ |
617 | cmdlen = strlen (args); |
618 | /* v2loadimage passes command lines via DOS memory, so it cannot | |
619 | possibly handle commands longer than 1MB. */ | |
620 | if (cmdlen > 1024*1024) | |
621 | error ("Command line too long."); | |
622 | ||
623 | cmdline = xmalloc (cmdlen + 4); | |
e49d4fa6 | 624 | strcpy (cmdline + 1, args); |
150985e3 EZ |
625 | /* If the command-line length fits into DOS 126-char limits, use the |
626 | DOS command tail format; otherwise, tell v2loadimage to pass it | |
627 | through a buffer in conventional memory. */ | |
628 | if (cmdlen < 127) | |
629 | { | |
630 | cmdline[0] = strlen (args); | |
631 | cmdline[cmdlen + 1] = 13; | |
632 | } | |
633 | else | |
634 | cmdline[0] = 0xff; /* signal v2loadimage it's a long command */ | |
e49d4fa6 SS |
635 | |
636 | environ = env; | |
637 | ||
638 | if (v2loadimage (exec_file, cmdline, start_state)) | |
639 | { | |
640 | environ = env_save; | |
641 | printf_unfiltered ("Load failed for image %s\n", exec_file); | |
642 | exit (1); | |
643 | } | |
644 | environ = env_save; | |
12a498f3 | 645 | xfree (cmdline); |
e49d4fa6 SS |
646 | |
647 | edi_init (start_state); | |
53a5351d JM |
648 | #if __DJGPP_MINOR__ < 3 |
649 | save_npx (); | |
650 | #endif | |
e49d4fa6 | 651 | |
39f77062 | 652 | inferior_ptid = pid_to_ptid (SOME_PID); |
e49d4fa6 SS |
653 | push_target (&go32_ops); |
654 | clear_proceed_status (); | |
655 | insert_breakpoints (); | |
2acceee2 | 656 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); |
b83266a0 | 657 | prog_has_started = 1; |
e49d4fa6 SS |
658 | } |
659 | ||
660 | static void | |
661 | go32_mourn_inferior (void) | |
662 | { | |
53a5351d JM |
663 | /* We need to make sure all the breakpoint enable bits in the DR7 |
664 | register are reset when the inferior exits. Otherwise, if they | |
665 | rerun the inferior, the uncleared bits may cause random SIGTRAPs, | |
666 | failure to set more watchpoints, and other calamities. It would | |
667 | be nice if GDB itself would take care to remove all breakpoints | |
668 | at all times, but it doesn't, probably under an assumption that | |
669 | the OS cleans up when the debuggee exits. */ | |
e24d4c64 | 670 | i386_cleanup_dregs (); |
e49d4fa6 SS |
671 | go32_kill_inferior (); |
672 | generic_mourn_inferior (); | |
673 | } | |
674 | ||
675 | static int | |
676 | go32_can_run (void) | |
677 | { | |
678 | return 1; | |
679 | } | |
680 | ||
e49d4fa6 SS |
681 | /* Hardware watchpoint support. */ |
682 | ||
e49d4fa6 | 683 | #define D_REGS edi.dr |
e24d4c64 EZ |
684 | #define CONTROL D_REGS[7] |
685 | #define STATUS D_REGS[6] | |
53a5351d | 686 | |
e24d4c64 EZ |
687 | /* Pass the address ADDR to the inferior in the I'th debug register. |
688 | Here we just store the address in D_REGS, the watchpoint will be | |
689 | actually set up when go32_wait runs the debuggee. */ | |
690 | void | |
691 | go32_set_dr (int i, CORE_ADDR addr) | |
e49d4fa6 | 692 | { |
4d277981 EZ |
693 | if (i < 0 || i > 3) |
694 | internal_error (__FILE__, __LINE__, | |
695 | "Invalid register %d in go32_set_dr.\n", i); | |
e24d4c64 | 696 | D_REGS[i] = addr; |
e49d4fa6 SS |
697 | } |
698 | ||
e24d4c64 EZ |
699 | /* Pass the value VAL to the inferior in the DR7 debug control |
700 | register. Here we just store the address in D_REGS, the watchpoint | |
701 | will be actually set up when go32_wait runs the debuggee. */ | |
702 | void | |
703 | go32_set_dr7 (unsigned val) | |
53a5351d | 704 | { |
e24d4c64 | 705 | CONTROL = val; |
53a5351d JM |
706 | } |
707 | ||
e24d4c64 EZ |
708 | /* Get the value of the DR6 debug status register from the inferior. |
709 | Here we just return the value stored in D_REGS, as we've got it | |
710 | from the last go32_wait call. */ | |
711 | unsigned | |
712 | go32_get_dr6 (void) | |
e49d4fa6 | 713 | { |
e24d4c64 | 714 | return STATUS; |
e49d4fa6 SS |
715 | } |
716 | ||
53a5351d JM |
717 | /* Put the device open on handle FD into either raw or cooked |
718 | mode, return 1 if it was in raw mode, zero otherwise. */ | |
719 | ||
720 | static int | |
721 | device_mode (int fd, int raw_p) | |
722 | { | |
723 | int oldmode, newmode; | |
724 | __dpmi_regs regs; | |
725 | ||
726 | regs.x.ax = 0x4400; | |
727 | regs.x.bx = fd; | |
728 | __dpmi_int (0x21, ®s); | |
729 | if (regs.x.flags & 1) | |
730 | return -1; | |
731 | newmode = oldmode = regs.x.dx; | |
732 | ||
733 | if (raw_p) | |
734 | newmode |= 0x20; | |
735 | else | |
736 | newmode &= ~0x20; | |
737 | ||
738 | if (oldmode & 0x80) /* Only for character dev */ | |
739 | { | |
740 | regs.x.ax = 0x4401; | |
741 | regs.x.bx = fd; | |
742 | regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails */ | |
743 | __dpmi_int (0x21, ®s); | |
744 | if (regs.x.flags & 1) | |
745 | return -1; | |
746 | } | |
747 | return (oldmode & 0x20) == 0x20; | |
748 | } | |
749 | ||
750 | ||
751 | static int inf_mode_valid = 0; | |
752 | static int inf_terminal_mode; | |
753 | ||
754 | /* This semaphore is needed because, amazingly enough, GDB calls | |
755 | target.to_terminal_ours more than once after the inferior stops. | |
756 | But we need the information from the first call only, since the | |
757 | second call will always see GDB's own cooked terminal. */ | |
758 | static int terminal_is_ours = 1; | |
759 | ||
cce74817 JM |
760 | static void |
761 | go32_terminal_init (void) | |
762 | { | |
53a5351d JM |
763 | inf_mode_valid = 0; /* reinitialize, in case they are restarting child */ |
764 | terminal_is_ours = 1; | |
cce74817 JM |
765 | } |
766 | ||
767 | static void | |
4d277981 | 768 | go32_terminal_info (char *args, int from_tty) |
cce74817 | 769 | { |
53a5351d JM |
770 | printf_unfiltered ("Inferior's terminal is in %s mode.\n", |
771 | !inf_mode_valid | |
772 | ? "default" : inf_terminal_mode ? "raw" : "cooked"); | |
773 | ||
774 | #if __DJGPP_MINOR__ > 2 | |
775 | if (child_cmd.redirection) | |
776 | { | |
777 | int i; | |
778 | ||
779 | for (i = 0; i < DBG_HANDLES; i++) | |
c5aa993b | 780 | { |
53a5351d JM |
781 | if (child_cmd.redirection[i]->file_name) |
782 | printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n", | |
783 | i, child_cmd.redirection[i]->file_name); | |
784 | else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1) | |
785 | printf_unfiltered | |
786 | ("\tFile handle %d appears to be closed by inferior.\n", i); | |
787 | /* Mask off the raw/cooked bit when comparing device info words. */ | |
788 | else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf) | |
789 | != (_get_dev_info (i) & 0xdf)) | |
790 | printf_unfiltered | |
791 | ("\tFile handle %d appears to be redirected by inferior.\n", i); | |
c5aa993b | 792 | } |
53a5351d JM |
793 | } |
794 | #endif | |
795 | } | |
796 | ||
797 | static void | |
798 | go32_terminal_inferior (void) | |
799 | { | |
800 | /* Redirect standard handles as child wants them. */ | |
801 | errno = 0; | |
802 | if (redir_to_child (&child_cmd) == -1) | |
803 | { | |
804 | redir_to_debugger (&child_cmd); | |
805 | error ("Cannot redirect standard handles for program: %s.", | |
806 | strerror (errno)); | |
807 | } | |
808 | /* set the console device of the inferior to whatever mode | |
809 | (raw or cooked) we found it last time */ | |
810 | if (terminal_is_ours) | |
811 | { | |
812 | if (inf_mode_valid) | |
813 | device_mode (0, inf_terminal_mode); | |
814 | terminal_is_ours = 0; | |
815 | } | |
cce74817 JM |
816 | } |
817 | ||
818 | static void | |
819 | go32_terminal_ours (void) | |
820 | { | |
53a5351d JM |
821 | /* Switch to cooked mode on the gdb terminal and save the inferior |
822 | terminal mode to be restored when it is resumed */ | |
823 | if (!terminal_is_ours) | |
824 | { | |
825 | inf_terminal_mode = device_mode (0, 0); | |
826 | if (inf_terminal_mode != -1) | |
827 | inf_mode_valid = 1; | |
828 | else | |
829 | /* If device_mode returned -1, we don't know what happens with | |
830 | handle 0 anymore, so make the info invalid. */ | |
831 | inf_mode_valid = 0; | |
832 | terminal_is_ours = 1; | |
833 | ||
834 | /* Restore debugger's standard handles. */ | |
835 | errno = 0; | |
836 | if (redir_to_debugger (&child_cmd) == -1) | |
837 | { | |
838 | redir_to_child (&child_cmd); | |
839 | error ("Cannot redirect standard handles for debugger: %s.", | |
840 | strerror (errno)); | |
841 | } | |
842 | } | |
cce74817 JM |
843 | } |
844 | ||
e49d4fa6 SS |
845 | static void |
846 | init_go32_ops (void) | |
847 | { | |
848 | go32_ops.to_shortname = "djgpp"; | |
849 | go32_ops.to_longname = "djgpp target process"; | |
850 | go32_ops.to_doc = | |
851 | "Program loaded by djgpp, when gdb is used as an external debugger"; | |
852 | go32_ops.to_open = go32_open; | |
853 | go32_ops.to_close = go32_close; | |
53a5351d | 854 | go32_ops.to_attach = go32_attach; |
e49d4fa6 SS |
855 | go32_ops.to_detach = go32_detach; |
856 | go32_ops.to_resume = go32_resume; | |
857 | go32_ops.to_wait = go32_wait; | |
858 | go32_ops.to_fetch_registers = go32_fetch_registers; | |
859 | go32_ops.to_store_registers = go32_store_registers; | |
860 | go32_ops.to_prepare_to_store = go32_prepare_to_store; | |
861 | go32_ops.to_xfer_memory = go32_xfer_memory; | |
862 | go32_ops.to_files_info = go32_files_info; | |
863 | go32_ops.to_insert_breakpoint = memory_insert_breakpoint; | |
864 | go32_ops.to_remove_breakpoint = memory_remove_breakpoint; | |
cce74817 JM |
865 | go32_ops.to_terminal_init = go32_terminal_init; |
866 | go32_ops.to_terminal_inferior = go32_terminal_inferior; | |
53a5351d | 867 | go32_ops.to_terminal_ours_for_output = go32_terminal_ours; |
cce74817 | 868 | go32_ops.to_terminal_ours = go32_terminal_ours; |
53a5351d | 869 | go32_ops.to_terminal_info = go32_terminal_info; |
e49d4fa6 SS |
870 | go32_ops.to_kill = go32_kill_inferior; |
871 | go32_ops.to_create_inferior = go32_create_inferior; | |
872 | go32_ops.to_mourn_inferior = go32_mourn_inferior; | |
873 | go32_ops.to_can_run = go32_can_run; | |
874 | go32_ops.to_stop = go32_stop; | |
875 | go32_ops.to_stratum = process_stratum; | |
876 | go32_ops.to_has_all_memory = 1; | |
877 | go32_ops.to_has_memory = 1; | |
878 | go32_ops.to_has_stack = 1; | |
879 | go32_ops.to_has_registers = 1; | |
880 | go32_ops.to_has_execution = 1; | |
881 | go32_ops.to_magic = OPS_MAGIC; | |
53a5351d | 882 | |
3a45aed8 EZ |
883 | /* Initialize child's cwd as empty to be initialized when starting |
884 | the child. */ | |
885 | *child_cwd = 0; | |
53a5351d JM |
886 | |
887 | /* Initialize child's command line storage. */ | |
888 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 AC |
889 | internal_error (__FILE__, __LINE__, |
890 | "Cannot allocate redirection storage: not enough memory.\n"); | |
0fff5247 EZ |
891 | |
892 | /* We are always processing GCC-compiled programs. */ | |
893 | processing_gcc_compilation = 2; | |
e49d4fa6 SS |
894 | } |
895 | ||
10ba702d EZ |
896 | unsigned short windows_major, windows_minor; |
897 | ||
898 | /* Compute the version Windows reports via Int 2Fh/AX=1600h. */ | |
899 | static void | |
900 | go32_get_windows_version(void) | |
901 | { | |
902 | __dpmi_regs r; | |
903 | ||
904 | r.x.ax = 0x1600; | |
905 | __dpmi_int(0x2f, &r); | |
906 | if (r.h.al > 2 && r.h.al != 0x80 && r.h.al != 0xff | |
907 | && (r.h.al > 3 || r.h.ah > 0)) | |
908 | { | |
909 | windows_major = r.h.al; | |
910 | windows_minor = r.h.ah; | |
911 | } | |
912 | else | |
913 | windows_major = 0xff; /* meaning no Windows */ | |
914 | } | |
915 | ||
916 | /* A subroutine of go32_sysinfo to display memory info. */ | |
917 | static void | |
918 | print_mem (unsigned long datum, const char *header, int in_pages_p) | |
919 | { | |
920 | if (datum != 0xffffffffUL) | |
921 | { | |
922 | if (in_pages_p) | |
923 | datum <<= 12; | |
924 | puts_filtered (header); | |
925 | if (datum > 1024) | |
926 | { | |
927 | printf_filtered ("%lu KB", datum >> 10); | |
928 | if (datum > 1024 * 1024) | |
929 | printf_filtered (" (%lu MB)", datum >> 20); | |
930 | } | |
931 | else | |
932 | printf_filtered ("%lu Bytes", datum); | |
933 | puts_filtered ("\n"); | |
934 | } | |
935 | } | |
936 | ||
937 | /* Display assorted information about the underlying OS. */ | |
938 | static void | |
939 | go32_sysinfo (char *arg, int from_tty) | |
940 | { | |
941 | struct utsname u; | |
942 | char cpuid_vendor[13]; | |
943 | unsigned cpuid_max = 0, cpuid_eax, cpuid_ebx, cpuid_ecx, cpuid_edx; | |
944 | unsigned true_dos_version = _get_dos_version (1); | |
945 | unsigned advertized_dos_version = ((unsigned int)_osmajor << 8) | _osminor; | |
946 | int dpmi_flags; | |
947 | char dpmi_vendor_info[129]; | |
948 | int dpmi_vendor_available = | |
949 | __dpmi_get_capabilities (&dpmi_flags, dpmi_vendor_info); | |
950 | __dpmi_version_ret dpmi_version_data; | |
951 | long eflags; | |
952 | __dpmi_free_mem_info mem_info; | |
953 | __dpmi_regs regs; | |
954 | ||
955 | cpuid_vendor[0] = '\0'; | |
956 | if (uname (&u)) | |
957 | strcpy (u.machine, "Unknown x86"); | |
958 | else if (u.machine[0] == 'i' && u.machine[1] > 4) | |
959 | { | |
960 | /* CPUID with EAX = 0 returns the Vendor ID. */ | |
961 | __asm__ __volatile__ ("xorl %%ebx, %%ebx;" | |
962 | "xorl %%ecx, %%ecx;" | |
963 | "xorl %%edx, %%edx;" | |
964 | "movl $0, %%eax;" | |
965 | "cpuid;" | |
966 | "movl %%ebx, %0;" | |
967 | "movl %%edx, %1;" | |
968 | "movl %%ecx, %2;" | |
969 | "movl %%eax, %3;" | |
970 | : "=m" (cpuid_vendor[0]), | |
971 | "=m" (cpuid_vendor[4]), | |
972 | "=m" (cpuid_vendor[8]), | |
973 | "=m" (cpuid_max) | |
974 | : | |
975 | : "%eax", "%ebx", "%ecx", "%edx"); | |
976 | cpuid_vendor[12] = '\0'; | |
977 | } | |
978 | ||
979 | printf_filtered ("CPU Type.......................%s", u.machine); | |
980 | if (cpuid_vendor[0]) | |
981 | printf_filtered (" (%s)", cpuid_vendor); | |
982 | puts_filtered ("\n"); | |
983 | ||
984 | /* CPUID with EAX = 1 returns processor signature and features. */ | |
985 | if (cpuid_max >= 1) | |
986 | { | |
987 | static char *brand_name[] = { | |
988 | "", | |
989 | " Celeron", | |
990 | " III", | |
991 | " III Xeon", | |
992 | "", "", "", "", | |
993 | " 4" | |
994 | }; | |
995 | char cpu_string[80]; | |
996 | char cpu_brand[20]; | |
997 | unsigned brand_idx; | |
998 | int intel_p = strcmp (cpuid_vendor, "GenuineIntel") == 0; | |
999 | int amd_p = strcmp (cpuid_vendor, "AuthenticAMD") == 0; | |
1000 | unsigned cpu_family, cpu_model; | |
1001 | ||
1002 | __asm__ __volatile__ ("movl $1, %%eax;" | |
1003 | "cpuid;" | |
1004 | : "=a" (cpuid_eax), | |
1005 | "=b" (cpuid_ebx), | |
1006 | "=d" (cpuid_edx) | |
1007 | : | |
1008 | : "%ecx"); | |
1009 | brand_idx = cpuid_ebx & 0xff; | |
1010 | cpu_family = (cpuid_eax >> 8) & 0xf; | |
1011 | cpu_model = (cpuid_eax >> 4) & 0xf; | |
1012 | cpu_brand[0] = '\0'; | |
1013 | if (intel_p) | |
1014 | { | |
1015 | if (brand_idx > 0 | |
1016 | && brand_idx < sizeof(brand_name)/sizeof(brand_name[0]) | |
1017 | && *brand_name[brand_idx]) | |
1018 | strcpy (cpu_brand, brand_name[brand_idx]); | |
1019 | else if (cpu_family == 5) | |
1020 | { | |
1021 | if (((cpuid_eax >> 12) & 3) == 0 && cpu_model == 4) | |
1022 | strcpy (cpu_brand, " MMX"); | |
1023 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 1) | |
1024 | strcpy (cpu_brand, " OverDrive"); | |
1025 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 2) | |
1026 | strcpy (cpu_brand, " Dual"); | |
1027 | } | |
1028 | else if (cpu_family == 6 && cpu_model < 8) | |
1029 | { | |
1030 | switch (cpu_model) | |
1031 | { | |
1032 | case 1: | |
1033 | strcpy (cpu_brand, " Pro"); | |
1034 | break; | |
1035 | case 3: | |
1036 | strcpy (cpu_brand, " II"); | |
1037 | break; | |
1038 | case 5: | |
1039 | strcpy (cpu_brand, " II Xeon"); | |
1040 | break; | |
1041 | case 6: | |
1042 | strcpy (cpu_brand, " Celeron"); | |
1043 | break; | |
1044 | case 7: | |
1045 | strcpy (cpu_brand, " III"); | |
1046 | break; | |
1047 | } | |
1048 | } | |
1049 | } | |
1050 | else if (amd_p) | |
1051 | { | |
1052 | switch (cpu_family) | |
1053 | { | |
1054 | case 4: | |
1055 | strcpy (cpu_brand, "486/5x86"); | |
1056 | break; | |
1057 | case 5: | |
1058 | switch (cpu_model) | |
1059 | { | |
1060 | case 0: | |
1061 | case 1: | |
1062 | case 2: | |
1063 | case 3: | |
1064 | strcpy (cpu_brand, "-K5"); | |
1065 | break; | |
1066 | case 6: | |
1067 | case 7: | |
1068 | strcpy (cpu_brand, "-K6"); | |
1069 | break; | |
1070 | case 8: | |
1071 | strcpy (cpu_brand, "-K6-2"); | |
1072 | break; | |
1073 | case 9: | |
1074 | strcpy (cpu_brand, "-K6-III"); | |
1075 | break; | |
1076 | } | |
1077 | break; | |
1078 | case 6: | |
1079 | switch (cpu_model) | |
1080 | { | |
1081 | case 1: | |
1082 | case 2: | |
1083 | case 4: | |
1084 | strcpy (cpu_brand, " Athlon"); | |
1085 | break; | |
1086 | case 3: | |
1087 | strcpy (cpu_brand, " Duron"); | |
1088 | break; | |
1089 | } | |
1090 | break; | |
1091 | } | |
1092 | } | |
1093 | sprintf (cpu_string, "%s%s Model %d Stepping %d", | |
1094 | intel_p ? "Pentium" : (amd_p ? "AMD" : "ix86"), | |
1095 | cpu_brand, cpu_model, cpuid_eax & 0xf); | |
1096 | printfi_filtered (31, "%s\n", cpu_string); | |
1097 | if (((cpuid_edx & (6 | (0x0d << 23))) != 0) | |
1098 | || ((cpuid_edx & 1) == 0) | |
1099 | || (amd_p && (cpuid_edx & (3 << 30)) != 0)) | |
1100 | { | |
1101 | puts_filtered ("CPU Features..................."); | |
1102 | /* We only list features which might be useful in the DPMI | |
1103 | environment. */ | |
1104 | if ((cpuid_edx & 1) == 0) | |
1105 | puts_filtered ("No FPU "); /* it's unusual to not have an FPU */ | |
1106 | if ((cpuid_edx & (1 << 1)) != 0) | |
1107 | puts_filtered ("VME "); | |
1108 | if ((cpuid_edx & (1 << 2)) != 0) | |
1109 | puts_filtered ("DE "); | |
1110 | if ((cpuid_edx & (1 << 4)) != 0) | |
1111 | puts_filtered ("TSC "); | |
1112 | if ((cpuid_edx & (1 << 23)) != 0) | |
1113 | puts_filtered ("MMX "); | |
1114 | if ((cpuid_edx & (1 << 25)) != 0) | |
1115 | puts_filtered ("SSE "); | |
1116 | if ((cpuid_edx & (1 << 26)) != 0) | |
1117 | puts_filtered ("SSE2 "); | |
1118 | if (amd_p) | |
1119 | { | |
1120 | if ((cpuid_edx & (1 << 31)) != 0) | |
1121 | puts_filtered ("3DNow! "); | |
1122 | if ((cpuid_edx & (1 << 30)) != 0) | |
1123 | puts_filtered ("3DNow!Ext"); | |
1124 | } | |
1125 | puts_filtered ("\n"); | |
1126 | } | |
1127 | } | |
1128 | puts_filtered ("\n"); | |
1129 | printf_filtered ("DOS Version....................%s %s.%s", | |
1130 | _os_flavor, u.release, u.version); | |
1131 | if (true_dos_version != advertized_dos_version) | |
1132 | printf_filtered (" (disguised as v%d.%d)", _osmajor, _osminor); | |
1133 | puts_filtered ("\n"); | |
1134 | if (!windows_major) | |
1135 | go32_get_windows_version (); | |
1136 | if (windows_major != 0xff) | |
1137 | { | |
1138 | const char *windows_flavor; | |
1139 | ||
1140 | printf_filtered ("Windows Version................%d.%02d (Windows ", | |
1141 | windows_major, windows_minor); | |
1142 | switch (windows_major) | |
1143 | { | |
1144 | case 3: | |
1145 | windows_flavor = "3.X"; | |
1146 | break; | |
1147 | case 4: | |
1148 | switch (windows_minor) | |
1149 | { | |
1150 | case 0: | |
1151 | windows_flavor = "95, 95A, or 95B"; | |
1152 | break; | |
1153 | case 3: | |
1154 | windows_flavor = "95B OSR2.1 or 95C OSR2.5"; | |
1155 | break; | |
1156 | case 10: | |
1157 | windows_flavor = "98 or 98 SE"; | |
1158 | break; | |
1159 | case 90: | |
1160 | windows_flavor = "ME"; | |
1161 | break; | |
1162 | default: | |
1163 | windows_flavor = "9X"; | |
1164 | break; | |
1165 | } | |
1166 | break; | |
1167 | default: | |
1168 | windows_flavor = "??"; | |
1169 | break; | |
1170 | } | |
1171 | printf_filtered ("%s)\n", windows_flavor); | |
1172 | } | |
1173 | else if (true_dos_version == 0x532 && advertized_dos_version == 0x500) | |
1174 | printf_filtered ("Windows Version................Windows NT or Windows 2000\n"); | |
1175 | puts_filtered ("\n"); | |
1176 | if (dpmi_vendor_available == 0) | |
1177 | { | |
1178 | /* The DPMI spec says the vendor string should be ASCIIZ, but | |
1179 | I don't trust the vendors to follow that... */ | |
1180 | if (!memchr (&dpmi_vendor_info[2], 0, 126)) | |
1181 | dpmi_vendor_info[128] = '\0'; | |
1182 | printf_filtered ("DPMI Host......................%s v%d.%d (capabilities: %#x)\n", | |
1183 | &dpmi_vendor_info[2], | |
1184 | (unsigned)dpmi_vendor_info[0], | |
1185 | (unsigned)dpmi_vendor_info[1], | |
1186 | ((unsigned)dpmi_flags & 0x7f)); | |
1187 | } | |
1188 | __dpmi_get_version (&dpmi_version_data); | |
1189 | printf_filtered ("DPMI Version...................%d.%02d\n", | |
1190 | dpmi_version_data.major, dpmi_version_data.minor); | |
1191 | printf_filtered ("DPMI Info......................%s-bit DPMI, with%s Virtual Memory support\n", | |
1192 | (dpmi_version_data.flags & 1) ? "32" : "16", | |
1193 | (dpmi_version_data.flags & 4) ? "" : "out"); | |
1194 | printfi_filtered (31, "Interrupts reflected to %s mode\n", | |
1195 | (dpmi_version_data.flags & 2) ? "V86" : "Real"); | |
1196 | printfi_filtered (31, "Processor type: i%d86\n", | |
1197 | dpmi_version_data.cpu); | |
1198 | printfi_filtered (31, "PIC base interrupt: Master: %#x Slave: %#x\n", | |
1199 | dpmi_version_data.master_pic, dpmi_version_data.slave_pic); | |
1200 | ||
1201 | /* a_tss is only initialized when the debuggee is first run. */ | |
1202 | if (prog_has_started) | |
1203 | { | |
1204 | __asm__ __volatile__ ("pushfl ; popl %0" : "=g" (eflags)); | |
1205 | printf_filtered ("Protection.....................Ring %d (in %s), with%s I/O protection\n", | |
1206 | a_tss.tss_cs & 3, (a_tss.tss_cs & 4) ? "LDT" : "GDT", | |
1207 | (a_tss.tss_cs & 3) > ((eflags >> 12) & 3) ? "" : "out"); | |
1208 | } | |
1209 | puts_filtered ("\n"); | |
1210 | __dpmi_get_free_memory_information (&mem_info); | |
1211 | print_mem (mem_info.total_number_of_physical_pages, | |
1212 | "DPMI Total Physical Memory.....", 1); | |
1213 | print_mem (mem_info.total_number_of_free_pages, | |
1214 | "DPMI Free Physical Memory......", 1); | |
1215 | print_mem (mem_info.size_of_paging_file_partition_in_pages, | |
1216 | "DPMI Swap Space................", 1); | |
1217 | print_mem (mem_info.linear_address_space_size_in_pages, | |
1218 | "DPMI Total Linear Address Size.", 1); | |
1219 | print_mem (mem_info.free_linear_address_space_in_pages, | |
1220 | "DPMI Free Linear Address Size..", 1); | |
1221 | print_mem (mem_info.largest_available_free_block_in_bytes, | |
1222 | "DPMI Largest Free Memory Block.", 0); | |
1223 | ||
1224 | regs.h.ah = 0x48; | |
1225 | regs.x.bx = 0xffff; | |
1226 | __dpmi_int (0x21, ®s); | |
1227 | print_mem (regs.x.bx << 4, "Free DOS Memory................", 0); | |
1228 | regs.x.ax = 0x5800; | |
1229 | __dpmi_int (0x21, ®s); | |
1230 | if ((regs.x.flags & 1) == 0) | |
1231 | { | |
1232 | static const char *dos_hilo[] = { | |
1233 | "Low", "", "", "", "High", "", "", "", "High, then Low" | |
1234 | }; | |
1235 | static const char *dos_fit[] = { | |
1236 | "First", "Best", "Last" | |
1237 | }; | |
1238 | int hilo_idx = (regs.x.ax >> 4) & 0x0f; | |
1239 | int fit_idx = regs.x.ax & 0x0f; | |
1240 | ||
1241 | if (hilo_idx > 8) | |
1242 | hilo_idx = 0; | |
1243 | if (fit_idx > 2) | |
1244 | fit_idx = 0; | |
1245 | printf_filtered ("DOS Memory Allocation..........%s memory, %s fit\n", | |
1246 | dos_hilo[hilo_idx], dos_fit[fit_idx]); | |
1247 | regs.x.ax = 0x5802; | |
1248 | __dpmi_int (0x21, ®s); | |
1249 | if ((regs.x.flags & 1) != 0) | |
1250 | regs.h.al = 0; | |
1251 | printfi_filtered (31, "UMBs %sin DOS memory chain\n", | |
1252 | regs.h.al == 0 ? "not " : ""); | |
1253 | } | |
1254 | } | |
1255 | ||
1256 | struct seg_descr { | |
1257 | unsigned short limit0 __attribute__((packed)); | |
1258 | unsigned short base0 __attribute__((packed)); | |
1259 | unsigned char base1 __attribute__((packed)); | |
1260 | unsigned stype:5 __attribute__((packed)); | |
1261 | unsigned dpl:2 __attribute__((packed)); | |
1262 | unsigned present:1 __attribute__((packed)); | |
1263 | unsigned limit1:4 __attribute__((packed)); | |
1264 | unsigned available:1 __attribute__((packed)); | |
1265 | unsigned dummy:1 __attribute__((packed)); | |
1266 | unsigned bit32:1 __attribute__((packed)); | |
1267 | unsigned page_granular:1 __attribute__((packed)); | |
1268 | unsigned char base2 __attribute__((packed)); | |
1269 | }; | |
1270 | ||
1271 | struct gate_descr { | |
1272 | unsigned short offset0 __attribute__((packed)); | |
1273 | unsigned short selector __attribute__((packed)); | |
1274 | unsigned param_count:5 __attribute__((packed)); | |
1275 | unsigned dummy:3 __attribute__((packed)); | |
1276 | unsigned stype:5 __attribute__((packed)); | |
1277 | unsigned dpl:2 __attribute__((packed)); | |
1278 | unsigned present:1 __attribute__((packed)); | |
1279 | unsigned short offset1 __attribute__((packed)); | |
1280 | }; | |
1281 | ||
1282 | /* Read LEN bytes starting at logical address ADDR, and put the result | |
1283 | into DEST. Return 1 if success, zero if not. */ | |
1284 | static int | |
1285 | read_memory_region (unsigned long addr, void *dest, size_t len) | |
1286 | { | |
1287 | unsigned long dos_ds_limit = __dpmi_get_segment_limit (_dos_ds); | |
9f20bf26 | 1288 | int retval = 1; |
10ba702d EZ |
1289 | |
1290 | /* For the low memory, we can simply use _dos_ds. */ | |
1291 | if (addr <= dos_ds_limit - len) | |
1292 | dosmemget (addr, len, dest); | |
1293 | else | |
1294 | { | |
1295 | /* For memory above 1MB we need to set up a special segment to | |
1296 | be able to access that memory. */ | |
1297 | int sel = __dpmi_allocate_ldt_descriptors (1); | |
1298 | ||
9f20bf26 EZ |
1299 | if (sel <= 0) |
1300 | retval = 0; | |
1301 | else | |
1302 | { | |
1303 | int access_rights = __dpmi_get_descriptor_access_rights (sel); | |
1304 | size_t segment_limit = len - 1; | |
1305 | ||
1306 | /* Make sure the crucial bits in the descriptor access | |
1307 | rights are set correctly. Some DPMI providers might barf | |
1308 | if we set the segment limit to something that is not an | |
1309 | integral multiple of 4KB pages if the granularity bit is | |
1310 | not set to byte-granular, even though the DPMI spec says | |
1311 | it's the host's responsibility to set that bit correctly. */ | |
1312 | if (len > 1024 * 1024) | |
1313 | { | |
1314 | access_rights |= 0x8000; | |
1315 | /* Page-granular segments should have the low 12 bits of | |
1316 | the limit set. */ | |
1317 | segment_limit |= 0xfff; | |
1318 | } | |
1319 | else | |
1320 | access_rights &= ~0x8000; | |
1321 | ||
1322 | if (__dpmi_set_segment_base_address (sel, addr) != -1 | |
1323 | && __dpmi_set_descriptor_access_rights (sel, access_rights) != -1 | |
2033c18a EZ |
1324 | && __dpmi_set_segment_limit (sel, segment_limit) != -1 |
1325 | /* W2K silently fails to set the segment limit, leaving | |
1326 | it at zero; this test avoids the resulting crash. */ | |
1327 | && __dpmi_get_segment_limit (sel) >= segment_limit) | |
9f20bf26 EZ |
1328 | movedata (sel, 0, _my_ds (), (unsigned)dest, len); |
1329 | else | |
1330 | retval = 0; | |
1331 | ||
1332 | __dpmi_free_ldt_descriptor (sel); | |
1333 | } | |
10ba702d | 1334 | } |
9f20bf26 | 1335 | return retval; |
10ba702d EZ |
1336 | } |
1337 | ||
1338 | /* Get a segment descriptor stored at index IDX in the descriptor | |
1339 | table whose base address is TABLE_BASE. Return the descriptor | |
1340 | type, or -1 if failure. */ | |
1341 | static int | |
1342 | get_descriptor (unsigned long table_base, int idx, void *descr) | |
1343 | { | |
1344 | unsigned long addr = table_base + idx * 8; /* 8 bytes per entry */ | |
1345 | ||
1346 | if (read_memory_region (addr, descr, 8)) | |
1347 | return (int)((struct seg_descr *)descr)->stype; | |
1348 | return -1; | |
1349 | } | |
1350 | ||
1351 | struct dtr_reg { | |
1352 | unsigned short limit __attribute__((packed)); | |
1353 | unsigned long base __attribute__((packed)); | |
1354 | }; | |
1355 | ||
1356 | /* Display a segment descriptor stored at index IDX in a descriptor | |
1357 | table whose type is TYPE and whose base address is BASE_ADDR. If | |
1358 | FORCE is non-zero, display even invalid descriptors. */ | |
1359 | static void | |
1360 | display_descriptor (unsigned type, unsigned long base_addr, int idx, int force) | |
1361 | { | |
1362 | struct seg_descr descr; | |
1363 | struct gate_descr gate; | |
1364 | ||
1365 | /* Get the descriptor from the table. */ | |
1366 | if (idx == 0 && type == 0) | |
1367 | puts_filtered ("0x000: null descriptor\n"); | |
1368 | else if (get_descriptor (base_addr, idx, &descr) != -1) | |
1369 | { | |
1370 | /* For each type of descriptor table, this has a bit set if the | |
1371 | corresponding type of selectors is valid in that table. */ | |
1372 | static unsigned allowed_descriptors[] = { | |
1373 | 0xffffdafeL, /* GDT */ | |
1374 | 0x0000c0e0L, /* IDT */ | |
1375 | 0xffffdafaL /* LDT */ | |
1376 | }; | |
1377 | ||
1378 | /* If the program hasn't started yet, assume the debuggee will | |
1379 | have the same CPL as the debugger. */ | |
1380 | int cpl = prog_has_started ? (a_tss.tss_cs & 3) : _my_cs () & 3; | |
1381 | unsigned long limit = (descr.limit1 << 16) | descr.limit0; | |
1382 | ||
1383 | if (descr.present | |
1384 | && (allowed_descriptors[type] & (1 << descr.stype)) != 0) | |
1385 | { | |
1386 | printf_filtered ("0x%03x: ", | |
1387 | type == 1 | |
1388 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); | |
1389 | if (descr.page_granular) | |
1390 | limit = (limit << 12) | 0xfff; /* big segment: low 12 bit set */ | |
1391 | if (descr.stype == 1 || descr.stype == 2 || descr.stype == 3 | |
1392 | || descr.stype == 9 || descr.stype == 11 | |
1393 | || (descr.stype >= 16 && descr.stype < 32)) | |
1394 | printf_filtered ("base=0x%02x%02x%04x limit=0x%08lx", | |
1395 | descr.base2, descr.base1, descr.base0, limit); | |
1396 | ||
1397 | switch (descr.stype) | |
1398 | { | |
1399 | case 1: | |
1400 | case 3: | |
1401 | printf_filtered (" 16-bit TSS (task %sactive)", | |
1402 | descr.stype == 3 ? "" : "in"); | |
1403 | break; | |
1404 | case 2: | |
1405 | puts_filtered (" LDT"); | |
1406 | break; | |
1407 | case 4: | |
1408 | memcpy (&gate, &descr, sizeof gate); | |
1409 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1410 | gate.selector, gate.offset1, gate.offset0); | |
1411 | printf_filtered (" 16-bit Call Gate (params=%d)", | |
1412 | gate.param_count); | |
1413 | break; | |
1414 | case 5: | |
1415 | printf_filtered ("TSS selector=0x%04x", descr.base0); | |
1416 | printfi_filtered (16, "Task Gate"); | |
1417 | break; | |
1418 | case 6: | |
1419 | case 7: | |
1420 | memcpy (&gate, &descr, sizeof gate); | |
1421 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1422 | gate.selector, gate.offset1, gate.offset0); | |
1423 | printf_filtered (" 16-bit %s Gate", | |
1424 | descr.stype == 6 ? "Interrupt" : "Trap"); | |
1425 | break; | |
1426 | case 9: | |
1427 | case 11: | |
1428 | printf_filtered (" 32-bit TSS (task %sactive)", | |
1429 | descr.stype == 3 ? "" : "in"); | |
1430 | break; | |
1431 | case 12: | |
1432 | memcpy (&gate, &descr, sizeof gate); | |
1433 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1434 | gate.selector, gate.offset1, gate.offset0); | |
1435 | printf_filtered (" 32-bit Call Gate (params=%d)", | |
1436 | gate.param_count); | |
1437 | break; | |
1438 | case 14: | |
1439 | case 15: | |
1440 | memcpy (&gate, &descr, sizeof gate); | |
1441 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1442 | gate.selector, gate.offset1, gate.offset0); | |
1443 | printf_filtered (" 32-bit %s Gate", | |
1444 | descr.stype == 14 ? "Interrupt" : "Trap"); | |
1445 | break; | |
1446 | case 16: /* data segments */ | |
1447 | case 17: | |
1448 | case 18: | |
1449 | case 19: | |
1450 | case 20: | |
1451 | case 21: | |
1452 | case 22: | |
1453 | case 23: | |
1454 | printf_filtered (" %s-bit Data (%s Exp-%s%s)", | |
1455 | descr.bit32 ? "32" : "16", | |
1456 | descr.stype & 2 ? "Read/Write," : "Read-Only, ", | |
1457 | descr.stype & 4 ? "down" : "up", | |
1458 | descr.stype & 1 ? "" : ", N.Acc"); | |
1459 | break; | |
1460 | case 24: /* code segments */ | |
1461 | case 25: | |
1462 | case 26: | |
1463 | case 27: | |
1464 | case 28: | |
1465 | case 29: | |
1466 | case 30: | |
1467 | case 31: | |
1468 | printf_filtered (" %s-bit Code (%s, %sConf%s)", | |
1469 | descr.bit32 ? "32" : "16", | |
1470 | descr.stype & 2 ? "Exec/Read" : "Exec-Only", | |
1471 | descr.stype & 4 ? "" : "N.", | |
1472 | descr.stype & 1 ? "" : ", N.Acc"); | |
1473 | break; | |
1474 | default: | |
1475 | printf_filtered ("Unknown type 0x%02x", descr.stype); | |
1476 | break; | |
1477 | } | |
1478 | puts_filtered ("\n"); | |
1479 | } | |
1480 | else if (force) | |
1481 | { | |
1482 | printf_filtered ("0x%03x: ", | |
1483 | type == 1 | |
1484 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); | |
1485 | if (!descr.present) | |
1486 | puts_filtered ("Segment not present\n"); | |
1487 | else | |
1488 | printf_filtered ("Segment type 0x%02x is invalid in this table\n", | |
1489 | descr.stype); | |
1490 | } | |
1491 | } | |
1492 | else if (force) | |
1493 | printf_filtered ("0x%03x: Cannot read this descriptor\n", idx); | |
1494 | } | |
1495 | ||
1496 | static void | |
1497 | go32_sldt (char *arg, int from_tty) | |
1498 | { | |
1499 | struct dtr_reg gdtr; | |
1500 | unsigned short ldtr = 0; | |
1501 | int ldt_idx; | |
1502 | struct seg_descr ldt_descr; | |
1503 | long ldt_entry = -1L; | |
1504 | int cpl = (prog_has_started ? a_tss.tss_cs : _my_cs ()) & 3; | |
1505 | ||
1506 | if (arg && *arg) | |
1507 | { | |
1508 | while (*arg && isspace(*arg)) | |
1509 | arg++; | |
1510 | ||
1511 | if (*arg) | |
1512 | { | |
1513 | ldt_entry = parse_and_eval_long (arg); | |
1514 | if (ldt_entry < 0 | |
1515 | || (ldt_entry & 4) == 0 | |
1516 | || (ldt_entry & 3) != (cpl & 3)) | |
1517 | error ("Invalid LDT entry 0x%03x.", ldt_entry); | |
1518 | } | |
1519 | } | |
1520 | ||
1521 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1522 | __asm__ __volatile__ ("sldt %0" : "=m" (ldtr) : /* no inputs */ ); | |
1523 | ldt_idx = ldtr / 8; | |
1524 | if (ldt_idx == 0) | |
1525 | puts_filtered ("There is no LDT.\n"); | |
1526 | /* LDT's entry in the GDT must have the type LDT, which is 2. */ | |
1527 | else if (get_descriptor (gdtr.base, ldt_idx, &ldt_descr) != 2) | |
1528 | printf_filtered ("LDT is present (at %#x), but unreadable by GDB.\n", | |
1529 | ldt_descr.base0 | |
1530 | | (ldt_descr.base1 << 16) | |
1531 | | (ldt_descr.base2 << 24)); | |
1532 | else | |
1533 | { | |
1534 | unsigned base = | |
1535 | ldt_descr.base0 | |
1536 | | (ldt_descr.base1 << 16) | |
1537 | | (ldt_descr.base2 << 24); | |
1538 | unsigned limit = ldt_descr.limit0 | (ldt_descr.limit1 << 16); | |
1539 | int max_entry; | |
1540 | ||
1541 | if (ldt_descr.page_granular) | |
1542 | /* Page-granular segments must have the low 12 bits of their | |
1543 | limit set. */ | |
1544 | limit = (limit << 12) | 0xfff; | |
1545 | /* LDT cannot have more than 8K 8-byte entries, i.e. more than | |
1546 | 64KB. */ | |
1547 | if (limit > 0xffff) | |
1548 | limit = 0xffff; | |
1549 | ||
1550 | max_entry = (limit + 1) / 8; | |
1551 | ||
1552 | if (ldt_entry >= 0) | |
1553 | { | |
1554 | if (ldt_entry > limit) | |
1555 | error ("Invalid LDT entry %#x: outside valid limits [0..%#x]", | |
1556 | ldt_entry, limit); | |
1557 | ||
1558 | display_descriptor (ldt_descr.stype, base, ldt_entry / 8, 1); | |
1559 | } | |
1560 | else | |
1561 | { | |
1562 | int i; | |
1563 | ||
1564 | for (i = 0; i < max_entry; i++) | |
1565 | display_descriptor (ldt_descr.stype, base, i, 0); | |
1566 | } | |
1567 | } | |
1568 | } | |
1569 | ||
1570 | static void | |
1571 | go32_sgdt (char *arg, int from_tty) | |
1572 | { | |
1573 | struct dtr_reg gdtr; | |
1574 | long gdt_entry = -1L; | |
1575 | int max_entry; | |
1576 | ||
1577 | if (arg && *arg) | |
1578 | { | |
1579 | while (*arg && isspace(*arg)) | |
1580 | arg++; | |
1581 | ||
1582 | if (*arg) | |
1583 | { | |
1584 | gdt_entry = parse_and_eval_long (arg); | |
1585 | if (gdt_entry < 0 || (gdt_entry & 7) != 0) | |
1586 | error ("Invalid GDT entry 0x%03x: not an integral multiple of 8.", | |
1587 | gdt_entry); | |
1588 | } | |
1589 | } | |
1590 | ||
1591 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1592 | max_entry = (gdtr.limit + 1) / 8; | |
1593 | ||
1594 | if (gdt_entry >= 0) | |
1595 | { | |
1596 | if (gdt_entry > gdtr.limit) | |
1597 | error ("Invalid GDT entry %#x: outside valid limits [0..%#x]", | |
1598 | gdt_entry, gdtr.limit); | |
1599 | ||
1600 | display_descriptor (0, gdtr.base, gdt_entry / 8, 1); | |
1601 | } | |
1602 | else | |
1603 | { | |
1604 | int i; | |
1605 | ||
1606 | for (i = 0; i < max_entry; i++) | |
1607 | display_descriptor (0, gdtr.base, i, 0); | |
1608 | } | |
1609 | } | |
1610 | ||
1611 | static void | |
1612 | go32_sidt (char *arg, int from_tty) | |
1613 | { | |
1614 | struct dtr_reg idtr; | |
1615 | long idt_entry = -1L; | |
1616 | int max_entry; | |
1617 | ||
1618 | if (arg && *arg) | |
1619 | { | |
1620 | while (*arg && isspace(*arg)) | |
1621 | arg++; | |
1622 | ||
1623 | if (*arg) | |
1624 | { | |
1625 | idt_entry = parse_and_eval_long (arg); | |
1626 | if (idt_entry < 0) | |
9f20bf26 | 1627 | error ("Invalid (negative) IDT entry %d.", idt_entry); |
10ba702d EZ |
1628 | } |
1629 | } | |
1630 | ||
1631 | __asm__ __volatile__ ("sidt %0" : "=m" (idtr) : /* no inputs */ ); | |
1632 | max_entry = (idtr.limit + 1) / 8; | |
1633 | if (max_entry > 0x100) /* no more than 256 entries */ | |
1634 | max_entry = 0x100; | |
1635 | ||
1636 | if (idt_entry >= 0) | |
1637 | { | |
1638 | if (idt_entry > idtr.limit) | |
1639 | error ("Invalid IDT entry %#x: outside valid limits [0..%#x]", | |
1640 | idt_entry, idtr.limit); | |
1641 | ||
1642 | display_descriptor (1, idtr.base, idt_entry, 1); | |
1643 | } | |
1644 | else | |
1645 | { | |
1646 | int i; | |
1647 | ||
1648 | for (i = 0; i < max_entry; i++) | |
1649 | display_descriptor (1, idtr.base, i, 0); | |
1650 | } | |
1651 | } | |
1652 | ||
9f20bf26 EZ |
1653 | /* Cached linear address of the base of the page directory. For |
1654 | now, available only under CWSDPMI. Code based on ideas and | |
1655 | suggestions from Charles Sandmann <sandmann@clio.rice.edu>. */ | |
1656 | static unsigned long pdbr; | |
1657 | ||
1658 | static unsigned long | |
1659 | get_cr3 (void) | |
1660 | { | |
1661 | unsigned offset; | |
1662 | unsigned taskreg; | |
1663 | unsigned long taskbase, cr3; | |
1664 | struct dtr_reg gdtr; | |
1665 | ||
1666 | if (pdbr > 0 && pdbr <= 0xfffff) | |
1667 | return pdbr; | |
1668 | ||
1669 | /* Get the linear address of GDT and the Task Register. */ | |
1670 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1671 | __asm__ __volatile__ ("str %0" : "=m" (taskreg) : /* no inputs */ ); | |
1672 | ||
1673 | /* Task Register is a segment selector for the TSS of the current | |
1674 | task. Therefore, it can be used as an index into the GDT to get | |
1675 | at the segment descriptor for the TSS. To get the index, reset | |
1676 | the low 3 bits of the selector (which give the CPL). Add 2 to the | |
1677 | offset to point to the 3 low bytes of the base address. */ | |
1678 | offset = gdtr.base + (taskreg & 0xfff8) + 2; | |
1679 | ||
1680 | ||
1681 | /* CWSDPMI's task base is always under the 1MB mark. */ | |
1682 | if (offset > 0xfffff) | |
1683 | return 0; | |
1684 | ||
1685 | _farsetsel (_dos_ds); | |
1686 | taskbase = _farnspeekl (offset) & 0xffffffU; | |
1687 | taskbase += _farnspeekl (offset + 2) & 0xff000000U; | |
1688 | if (taskbase > 0xfffff) | |
1689 | return 0; | |
1690 | ||
1691 | /* CR3 (a.k.a. PDBR, the Page Directory Base Register) is stored at | |
1692 | offset 1Ch in the TSS. */ | |
1693 | cr3 = _farnspeekl (taskbase + 0x1c) & ~0xfff; | |
1694 | if (cr3 > 0xfffff) | |
1695 | { | |
1f5dc670 | 1696 | #if 0 /* not fullly supported yet */ |
9f20bf26 EZ |
1697 | /* The Page Directory is in UMBs. In that case, CWSDPMI puts |
1698 | the first Page Table right below the Page Directory. Thus, | |
1699 | the first Page Table's entry for its own address and the Page | |
1700 | Directory entry for that Page Table will hold the same | |
1701 | physical address. The loop below searches the entire UMB | |
1702 | range of addresses for such an occurence. */ | |
1703 | unsigned long addr, pte_idx; | |
1704 | ||
1705 | for (addr = 0xb0000, pte_idx = 0xb0; | |
1706 | pte_idx < 0xff; | |
1707 | addr += 0x1000, pte_idx++) | |
1708 | { | |
1709 | if (((_farnspeekl (addr + 4 * pte_idx) & 0xfffff027) == | |
1710 | (_farnspeekl (addr + 0x1000) & 0xfffff027)) | |
1711 | && ((_farnspeekl (addr + 4 * pte_idx + 4) & 0xfffff000) == cr3)) | |
1712 | { | |
1713 | cr3 = addr + 0x1000; | |
1714 | break; | |
1715 | } | |
1716 | } | |
a3b9cbb3 | 1717 | #endif |
9f20bf26 EZ |
1718 | |
1719 | if (cr3 > 0xfffff) | |
1720 | cr3 = 0; | |
1721 | } | |
1722 | ||
1723 | return cr3; | |
1724 | } | |
1725 | ||
1726 | /* Return the N'th Page Directory entry. */ | |
1727 | static unsigned long | |
1728 | get_pde (int n) | |
1729 | { | |
1730 | unsigned long pde = 0; | |
1731 | ||
1732 | if (pdbr && n >= 0 && n < 1024) | |
1733 | { | |
1734 | pde = _farpeekl (_dos_ds, pdbr + 4*n); | |
1735 | } | |
1736 | return pde; | |
1737 | } | |
1738 | ||
1739 | /* Return the N'th entry of the Page Table whose Page Directory entry | |
1740 | is PDE. */ | |
1741 | static unsigned long | |
1742 | get_pte (unsigned long pde, int n) | |
1743 | { | |
1744 | unsigned long pte = 0; | |
1745 | ||
1746 | /* pde & 0x80 tests the 4MB page bit. We don't support 4MB | |
1747 | page tables, for now. */ | |
1748 | if ((pde & 1) && !(pde & 0x80) && n >= 0 && n < 1024) | |
1749 | { | |
1750 | pde &= ~0xfff; /* clear non-address bits */ | |
1751 | pte = _farpeekl (_dos_ds, pde + 4*n); | |
1752 | } | |
1753 | return pte; | |
1754 | } | |
1755 | ||
1756 | /* Display a Page Directory or Page Table entry. IS_DIR, if non-zero, | |
1757 | says this is a Page Directory entry. If FORCE is non-zero, display | |
1758 | the entry even if its Present flag is off. OFF is the offset of the | |
1759 | address from the page's base address. */ | |
1760 | static void | |
1761 | display_ptable_entry (unsigned long entry, int is_dir, int force, unsigned off) | |
1762 | { | |
1763 | if ((entry & 1) != 0) | |
1764 | { | |
1765 | printf_filtered ("Base=0x%05lx000", entry >> 12); | |
1766 | if ((entry & 0x100) && !is_dir) | |
1767 | puts_filtered (" Global"); | |
1768 | if ((entry & 0x40) && !is_dir) | |
1769 | puts_filtered (" Dirty"); | |
1770 | printf_filtered (" %sAcc.", (entry & 0x20) ? "" : "Not-"); | |
1771 | printf_filtered (" %sCached", (entry & 0x10) ? "" : "Not-"); | |
1772 | printf_filtered (" Write-%s", (entry & 8) ? "Thru" : "Back"); | |
1773 | printf_filtered (" %s", (entry & 4) ? "Usr" : "Sup"); | |
1774 | printf_filtered (" Read-%s", (entry & 2) ? "Write" : "Only"); | |
1775 | if (off) | |
1776 | printf_filtered (" +0x%x", off); | |
1777 | puts_filtered ("\n"); | |
1778 | } | |
1779 | else if (force) | |
1780 | printf_filtered ("Page%s not present or not supported; value=0x%lx.\n", | |
1781 | is_dir ? " Table" : "", entry >> 1); | |
1782 | } | |
1783 | ||
1784 | static void | |
1785 | go32_pde (char *arg, int from_tty) | |
1786 | { | |
1787 | long pde_idx = -1, i; | |
1788 | ||
1789 | if (arg && *arg) | |
1790 | { | |
1791 | while (*arg && isspace(*arg)) | |
1792 | arg++; | |
1793 | ||
1794 | if (*arg) | |
1795 | { | |
1796 | pde_idx = parse_and_eval_long (arg); | |
1797 | if (pde_idx < 0 || pde_idx >= 1024) | |
1798 | error ("Entry %ld is outside valid limits [0..1023].", pde_idx); | |
1799 | } | |
1800 | } | |
1801 | ||
1802 | pdbr = get_cr3 (); | |
1803 | if (!pdbr) | |
1804 | puts_filtered ("Access to Page Directories is not supported on this system.\n"); | |
1805 | else if (pde_idx >= 0) | |
1806 | display_ptable_entry (get_pde (pde_idx), 1, 1, 0); | |
1807 | else | |
1808 | for (i = 0; i < 1024; i++) | |
1809 | display_ptable_entry (get_pde (i), 1, 0, 0); | |
1810 | } | |
1811 | ||
1812 | /* A helper function to display entries in a Page Table pointed to by | |
1813 | the N'th entry in the Page Directory. If FORCE is non-zero, say | |
1814 | something even if the Page Table is not accessible. */ | |
1815 | static void | |
1816 | display_page_table (long n, int force) | |
1817 | { | |
1818 | unsigned long pde = get_pde (n); | |
1819 | ||
1820 | if ((pde & 1) != 0) | |
1821 | { | |
1822 | int i; | |
1823 | ||
1824 | printf_filtered ("Page Table pointed to by Page Directory entry 0x%lx:\n", n); | |
1825 | for (i = 0; i < 1024; i++) | |
1826 | display_ptable_entry (get_pte (pde, i), 0, 0, 0); | |
1827 | puts_filtered ("\n"); | |
1828 | } | |
1829 | else if (force) | |
1830 | printf_filtered ("Page Table not present; value=0x%lx.\n", pde >> 1); | |
1831 | } | |
1832 | ||
1833 | static void | |
1834 | go32_pte (char *arg, int from_tty) | |
1835 | { | |
1836 | long pde_idx = -1, i; | |
1837 | ||
1838 | if (arg && *arg) | |
1839 | { | |
1840 | while (*arg && isspace(*arg)) | |
1841 | arg++; | |
1842 | ||
1843 | if (*arg) | |
1844 | { | |
1845 | pde_idx = parse_and_eval_long (arg); | |
1846 | if (pde_idx < 0 || pde_idx >= 1024) | |
1847 | error ("Entry %d is outside valid limits [0..1023].", pde_idx); | |
1848 | } | |
1849 | } | |
1850 | ||
1851 | pdbr = get_cr3 (); | |
1852 | if (!pdbr) | |
1853 | puts_filtered ("Access to Page Tables is not supported on this system.\n"); | |
1854 | else if (pde_idx >= 0) | |
1855 | display_page_table (pde_idx, 1); | |
1856 | else | |
1857 | for (i = 0; i < 1024; i++) | |
1858 | display_page_table (i, 0); | |
1859 | } | |
1860 | ||
1861 | static void | |
1862 | go32_pte_for_address (char *arg, int from_tty) | |
1863 | { | |
1864 | CORE_ADDR addr = 0, i; | |
1865 | ||
1866 | if (arg && *arg) | |
1867 | { | |
1868 | while (*arg && isspace(*arg)) | |
1869 | arg++; | |
1870 | ||
1871 | if (*arg) | |
1872 | addr = parse_and_eval_address (arg); | |
1873 | } | |
1874 | if (!addr) | |
1875 | error_no_arg ("linear address"); | |
1876 | ||
1877 | pdbr = get_cr3 (); | |
1878 | if (!pdbr) | |
1879 | puts_filtered ("Access to Page Tables is not supported on this system.\n"); | |
1880 | else | |
1881 | { | |
1882 | int pde_idx = (addr >> 22) & 0x3ff; | |
1883 | int pte_idx = (addr >> 12) & 0x3ff; | |
1884 | unsigned offs = addr & 0xfff; | |
1885 | ||
1886 | printf_filtered ("Page Table entry for address 0x%llx:\n", | |
1887 | (unsigned long long)addr); | |
1888 | display_ptable_entry (get_pte (get_pde (pde_idx), pte_idx), 0, 1, offs); | |
1889 | } | |
1890 | } | |
1891 | ||
d8c852a1 EZ |
1892 | static struct cmd_list_element *info_dos_cmdlist = NULL; |
1893 | ||
1894 | static void | |
1895 | go32_info_dos_command (char *args, int from_tty) | |
1896 | { | |
1897 | help_list (info_dos_cmdlist, "info dos ", class_info, gdb_stdout); | |
1898 | } | |
1899 | ||
e49d4fa6 SS |
1900 | void |
1901 | _initialize_go32_nat (void) | |
1902 | { | |
1903 | init_go32_ops (); | |
1904 | add_target (&go32_ops); | |
10ba702d | 1905 | |
d8c852a1 EZ |
1906 | add_prefix_cmd ("dos", class_info, go32_info_dos_command, |
1907 | "Print information specific to DJGPP (a.k.a. MS-DOS) debugging.", | |
1908 | &info_dos_cmdlist, "info dos ", 0, &infolist); | |
1909 | ||
1910 | add_cmd ("sysinfo", class_info, go32_sysinfo, | |
1911 | "Display information about the target system, including CPU, OS, DPMI, etc.", | |
1912 | &info_dos_cmdlist); | |
1913 | add_cmd ("ldt", class_info, go32_sldt, | |
1914 | "Display entries in the LDT (Local Descriptor Table).\n" | |
1915 | "Entry number (an expression) as an argument means display only that entry.", | |
1916 | &info_dos_cmdlist); | |
1917 | add_cmd ("gdt", class_info, go32_sgdt, | |
1918 | "Display entries in the GDT (Global Descriptor Table).\n" | |
1919 | "Entry number (an expression) as an argument means display only that entry.", | |
1920 | &info_dos_cmdlist); | |
1921 | add_cmd ("idt", class_info, go32_sidt, | |
1922 | "Display entries in the IDT (Interrupt Descriptor Table).\n" | |
1923 | "Entry number (an expression) as an argument means display only that entry.", | |
1924 | &info_dos_cmdlist); | |
9f20bf26 EZ |
1925 | add_cmd ("pde", class_info, go32_pde, |
1926 | "Display entries in the Page Directory.\n" | |
1927 | "Entry number (an expression) as an argument means display only that entry.", | |
1928 | &info_dos_cmdlist); | |
1929 | add_cmd ("pte", class_info, go32_pte, | |
1930 | "Display entries in Page Tables.\n" | |
1931 | "Entry number (an expression) as an argument means display only entries\n" | |
1932 | "from the Page Table pointed to by the specified Page Directory entry.", | |
1933 | &info_dos_cmdlist); | |
1934 | add_cmd ("address-pte", class_info, go32_pte_for_address, | |
1935 | "Display a Page Table entry for a linear address.\n" | |
1936 | "The address argument must be a linear address, after adding to\n" | |
1937 | "it the base address of the appropriate segment.\n" | |
1938 | "The base address of variables and functions in the debuggee's data\n" | |
1939 | "or code segment is stored in the variable __djgpp_base_address,\n" | |
1940 | "so use `__djgpp_base_address + (char *)&var' as the argument.\n" | |
1941 | "For other segments, look up their base address in the output of\n" | |
1942 | "the `info dos ldt' command.", | |
1943 | &info_dos_cmdlist); | |
e49d4fa6 | 1944 | } |
53a5351d JM |
1945 | |
1946 | pid_t | |
1947 | tcgetpgrp (int fd) | |
1948 | { | |
1949 | if (isatty (fd)) | |
1950 | return SOME_PID; | |
1951 | errno = ENOTTY; | |
1952 | return -1; | |
1953 | } | |
1954 | ||
1955 | int | |
1956 | tcsetpgrp (int fd, pid_t pgid) | |
1957 | { | |
1958 | if (isatty (fd) && pgid == SOME_PID) | |
1959 | return 0; | |
1960 | errno = pgid == SOME_PID ? ENOTTY : ENOSYS; | |
1961 | return -1; | |
1962 | } |