Commit | Line | Data |
---|---|---|
e49d4fa6 | 1 | /* Native debugging support for Intel x86 running DJGPP. |
28e7fd62 | 2 | Copyright (C) 1997-2013 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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 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 | 17 | You should have received a copy of the GNU General Public License |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
e49d4fa6 | 19 | |
699275c9 EZ |
20 | /* To whomever it may concern, here's a general description of how |
21 | debugging in DJGPP works, and the special quirks GDB does to | |
22 | support that. | |
23 | ||
24 | When the DJGPP port of GDB is debugging a DJGPP program natively, | |
25 | there aren't 2 separate processes, the debuggee and GDB itself, as | |
26 | on other systems. (This is DOS, where there can only be one active | |
27 | process at any given time, remember?) Instead, GDB and the | |
28 | debuggee live in the same process. So when GDB calls | |
29 | go32_create_inferior below, and that function calls edi_init from | |
30 | the DJGPP debug support library libdbg.a, we load the debuggee's | |
31 | executable file into GDB's address space, set it up for execution | |
32 | as the stub loader (a short real-mode program prepended to each | |
33 | DJGPP executable) normally would, and do a lot of preparations for | |
34 | swapping between GDB's and debuggee's internal state, primarily wrt | |
35 | the exception handlers. This swapping happens every time we resume | |
36 | the debuggee or switch back to GDB's code, and it includes: | |
37 | ||
38 | . swapping all the segment registers | |
39 | . swapping the PSP (the Program Segment Prefix) | |
40 | . swapping the signal handlers | |
41 | . swapping the exception handlers | |
42 | . swapping the FPU status | |
43 | . swapping the 3 standard file handles (more about this below) | |
44 | ||
45 | Then running the debuggee simply means longjmp into it where its PC | |
46 | is and let it run until it stops for some reason. When it stops, | |
47 | GDB catches the exception that stopped it and longjmp's back into | |
48 | its own code. All the possible exit points of the debuggee are | |
49 | watched; for example, the normal exit point is recognized because a | |
50 | DOS program issues a special system call to exit. If one of those | |
51 | exit points is hit, we mourn the inferior and clean up after it. | |
52 | Cleaning up is very important, even if the process exits normally, | |
53 | because otherwise we might leave behind traces of previous | |
54 | execution, and in several cases GDB itself might be left hosed, | |
55 | because all the exception handlers were not restored. | |
56 | ||
57 | Swapping of the standard handles (in redir_to_child and | |
58 | redir_to_debugger) is needed because, since both GDB and the | |
59 | debuggee live in the same process, as far as the OS is concerned, | |
60 | the share the same file table. This means that the standard | |
61 | handles 0, 1, and 2 point to the same file table entries, and thus | |
62 | are connected to the same devices. Therefore, if the debugger | |
63 | redirects its standard output, the standard output of the debuggee | |
64 | is also automagically redirected to the same file/device! | |
65 | Similarly, if the debuggee redirects its stdout to a file, you | |
66 | won't be able to see debugger's output (it will go to the same file | |
67 | where the debuggee has its output); and if the debuggee closes its | |
68 | standard input, you will lose the ability to talk to debugger! | |
69 | ||
70 | For this reason, every time the debuggee is about to be resumed, we | |
71 | call redir_to_child, which redirects the standard handles to where | |
72 | the debuggee expects them to be. When the debuggee stops and GDB | |
73 | regains control, we call redir_to_debugger, which redirects those 3 | |
74 | handles back to where GDB expects. | |
75 | ||
76 | Note that only the first 3 handles are swapped, so if the debuggee | |
77 | redirects or closes any other handles, GDB will not notice. In | |
78 | particular, the exit code of a DJGPP program forcibly closes all | |
79 | file handles beyond the first 3 ones, so when the debuggee exits, | |
80 | GDB currently loses its stdaux and stdprn streams. Fortunately, | |
81 | GDB does not use those as of this writing, and will never need | |
82 | to. */ | |
83 | ||
0baeab03 PA |
84 | #include "defs.h" |
85 | ||
e49d4fa6 SS |
86 | #include <fcntl.h> |
87 | ||
9bb9e8ad | 88 | #include "i386-nat.h" |
e49d4fa6 | 89 | #include "inferior.h" |
444c3224 | 90 | #include "gdbthread.h" |
03f2053f | 91 | #include "gdb_wait.h" |
e49d4fa6 SS |
92 | #include "gdbcore.h" |
93 | #include "command.h" | |
d8c852a1 | 94 | #include "gdbcmd.h" |
e49d4fa6 | 95 | #include "floatformat.h" |
0fff5247 | 96 | #include "buildsym.h" |
e750d25e | 97 | #include "i387-tdep.h" |
e1195560 | 98 | #include "i386-tdep.h" |
4d157a3d | 99 | #include "i386-cpuid.h" |
4d277981 | 100 | #include "value.h" |
4e052eda | 101 | #include "regcache.h" |
4d277981 | 102 | #include "gdb_string.h" |
eaae3919 | 103 | #include "top.h" |
529480d0 | 104 | #include "cli/cli-utils.h" |
e49d4fa6 | 105 | |
10ba702d | 106 | #include <stdio.h> /* might be required for __DJGPP_MINOR__ */ |
e49d4fa6 | 107 | #include <stdlib.h> |
10ba702d | 108 | #include <ctype.h> |
53a5351d | 109 | #include <errno.h> |
c2c6d25f | 110 | #include <unistd.h> |
10ba702d | 111 | #include <sys/utsname.h> |
53a5351d | 112 | #include <io.h> |
10ba702d | 113 | #include <dos.h> |
53a5351d | 114 | #include <dpmi.h> |
10ba702d | 115 | #include <go32.h> |
9f20bf26 | 116 | #include <sys/farptr.h> |
e49d4fa6 SS |
117 | #include <debug/v2load.h> |
118 | #include <debug/dbgcom.h> | |
53a5351d JM |
119 | #if __DJGPP_MINOR__ > 2 |
120 | #include <debug/redir.h> | |
121 | #endif | |
e49d4fa6 | 122 | |
10085bb5 EZ |
123 | #include <langinfo.h> |
124 | ||
b83266a0 | 125 | #if __DJGPP_MINOR__ < 3 |
0963b4bd MS |
126 | /* This code will be provided from DJGPP 2.03 on. Until then I code it |
127 | here. */ | |
c5aa993b JM |
128 | typedef struct |
129 | { | |
130 | unsigned short sig0; | |
131 | unsigned short sig1; | |
132 | unsigned short sig2; | |
133 | unsigned short sig3; | |
134 | unsigned short exponent:15; | |
135 | unsigned short sign:1; | |
136 | } | |
137 | NPXREG; | |
138 | ||
139 | typedef struct | |
140 | { | |
141 | unsigned int control; | |
142 | unsigned int status; | |
143 | unsigned int tag; | |
144 | unsigned int eip; | |
145 | unsigned int cs; | |
146 | unsigned int dataptr; | |
147 | unsigned int datasel; | |
148 | NPXREG reg[8]; | |
149 | } | |
150 | NPX; | |
b83266a0 SS |
151 | |
152 | static NPX npx; | |
153 | ||
0963b4bd MS |
154 | static void save_npx (void); /* Save the FPU of the debugged program. */ |
155 | static void load_npx (void); /* Restore the FPU of the debugged program. */ | |
b83266a0 SS |
156 | |
157 | /* ------------------------------------------------------------------------- */ | |
158 | /* Store the contents of the NPX in the global variable `npx'. */ | |
c5aa993b | 159 | /* *INDENT-OFF* */ |
b83266a0 SS |
160 | |
161 | static void | |
162 | save_npx (void) | |
163 | { | |
1f5dc670 EZ |
164 | asm ("inb $0xa0, %%al \n\ |
165 | testb $0x20, %%al \n\ | |
166 | jz 1f \n\ | |
82cc5033 EZ |
167 | xorb %%al, %%al \n\ |
168 | outb %%al, $0xf0 \n\ | |
1f5dc670 | 169 | movb $0x20, %%al \n\ |
82cc5033 EZ |
170 | outb %%al, $0xa0 \n\ |
171 | outb %%al, $0x20 \n\ | |
1f5dc670 | 172 | 1: \n\ |
82cc5033 | 173 | fnsave %0 \n\ |
c5aa993b JM |
174 | fwait " |
175 | : "=m" (npx) | |
176 | : /* No input */ | |
177 | : "%eax"); | |
b83266a0 | 178 | } |
c5aa993b JM |
179 | |
180 | /* *INDENT-ON* */ | |
181 | ||
182 | ||
b83266a0 SS |
183 | /* ------------------------------------------------------------------------- */ |
184 | /* Reload the contents of the NPX from the global variable `npx'. */ | |
185 | ||
186 | static void | |
187 | load_npx (void) | |
188 | { | |
ba8629a9 | 189 | asm ("frstor %0":"=m" (npx)); |
b83266a0 | 190 | } |
53a5351d JM |
191 | /* ------------------------------------------------------------------------- */ |
192 | /* Stubs for the missing redirection functions. */ | |
193 | typedef struct { | |
194 | char *command; | |
195 | int redirected; | |
196 | } cmdline_t; | |
197 | ||
4d277981 | 198 | void |
ba8629a9 EZ |
199 | redir_cmdline_delete (cmdline_t *ptr) |
200 | { | |
201 | ptr->redirected = 0; | |
202 | } | |
4d277981 EZ |
203 | |
204 | int | |
205 | redir_cmdline_parse (const char *args, cmdline_t *ptr) | |
53a5351d JM |
206 | { |
207 | return -1; | |
208 | } | |
ba8629a9 | 209 | |
4d277981 EZ |
210 | int |
211 | redir_to_child (cmdline_t *ptr) | |
53a5351d JM |
212 | { |
213 | return 1; | |
214 | } | |
ba8629a9 | 215 | |
4d277981 EZ |
216 | int |
217 | redir_to_debugger (cmdline_t *ptr) | |
53a5351d JM |
218 | { |
219 | return 1; | |
220 | } | |
ba8629a9 | 221 | |
4d277981 | 222 | int |
ba8629a9 EZ |
223 | redir_debug_init (cmdline_t *ptr) |
224 | { | |
225 | return 0; | |
226 | } | |
b83266a0 SS |
227 | #endif /* __DJGPP_MINOR < 3 */ |
228 | ||
53a5351d JM |
229 | typedef enum { wp_insert, wp_remove, wp_count } wp_op; |
230 | ||
231 | /* This holds the current reference counts for each debug register. */ | |
232 | static int dr_ref_count[4]; | |
233 | ||
e49d4fa6 SS |
234 | #define SOME_PID 42 |
235 | ||
e49d4fa6 | 236 | static int prog_has_started = 0; |
c5aa993b | 237 | static void go32_open (char *name, int from_tty); |
460014f5 | 238 | static void go32_close (void); |
685af672 EZ |
239 | static void go32_attach (struct target_ops *ops, char *args, int from_tty); |
240 | static void go32_detach (struct target_ops *ops, char *args, int from_tty); | |
28439f5e PA |
241 | static void go32_resume (struct target_ops *ops, |
242 | ptid_t ptid, int step, | |
2ea28649 | 243 | enum gdb_signal siggnal); |
28439f5e PA |
244 | static void go32_fetch_registers (struct target_ops *ops, |
245 | struct regcache *, int regno); | |
56be3814 | 246 | static void store_register (const struct regcache *, int regno); |
28439f5e PA |
247 | static void go32_store_registers (struct target_ops *ops, |
248 | struct regcache *, int regno); | |
316f2060 | 249 | static void go32_prepare_to_store (struct regcache *); |
9d0b3624 | 250 | static int go32_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, |
a17b5c4e EZ |
251 | int write, |
252 | struct mem_attrib *attrib, | |
253 | struct target_ops *target); | |
c5aa993b | 254 | static void go32_files_info (struct target_ops *target); |
7d85a9c0 | 255 | static void go32_kill_inferior (struct target_ops *ops); |
136d6dae VP |
256 | static void go32_create_inferior (struct target_ops *ops, char *exec_file, |
257 | char *args, char **env, int from_tty); | |
258 | static void go32_mourn_inferior (struct target_ops *ops); | |
c5aa993b | 259 | static int go32_can_run (void); |
b83266a0 SS |
260 | |
261 | static struct target_ops go32_ops; | |
c5aa993b JM |
262 | static void go32_terminal_init (void); |
263 | static void go32_terminal_inferior (void); | |
264 | static void go32_terminal_ours (void); | |
e49d4fa6 | 265 | |
53a5351d | 266 | #define r_ofs(x) (offsetof(TSS,x)) |
e49d4fa6 SS |
267 | |
268 | static struct | |
269 | { | |
53a5351d JM |
270 | size_t tss_ofs; |
271 | size_t size; | |
e49d4fa6 SS |
272 | } |
273 | regno_mapping[] = | |
274 | { | |
0fff5247 EZ |
275 | {r_ofs (tss_eax), 4}, /* normal registers, from a_tss */ |
276 | {r_ofs (tss_ecx), 4}, | |
277 | {r_ofs (tss_edx), 4}, | |
278 | {r_ofs (tss_ebx), 4}, | |
279 | {r_ofs (tss_esp), 4}, | |
280 | {r_ofs (tss_ebp), 4}, | |
281 | {r_ofs (tss_esi), 4}, | |
282 | {r_ofs (tss_edi), 4}, | |
283 | {r_ofs (tss_eip), 4}, | |
284 | {r_ofs (tss_eflags), 4}, | |
285 | {r_ofs (tss_cs), 2}, | |
286 | {r_ofs (tss_ss), 2}, | |
287 | {r_ofs (tss_ds), 2}, | |
288 | {r_ofs (tss_es), 2}, | |
289 | {r_ofs (tss_fs), 2}, | |
290 | {r_ofs (tss_gs), 2}, | |
291 | {0, 10}, /* 8 FP registers, from npx.reg[] */ | |
292 | {1, 10}, | |
293 | {2, 10}, | |
294 | {3, 10}, | |
295 | {4, 10}, | |
296 | {5, 10}, | |
297 | {6, 10}, | |
298 | {7, 10}, | |
53a5351d | 299 | /* The order of the next 7 registers must be consistent |
0fff5247 EZ |
300 | with their numbering in config/i386/tm-i386.h, which see. */ |
301 | {0, 2}, /* control word, from npx */ | |
302 | {4, 2}, /* status word, from npx */ | |
303 | {8, 2}, /* tag word, from npx */ | |
304 | {16, 2}, /* last FP exception CS from npx */ | |
305 | {12, 4}, /* last FP exception EIP from npx */ | |
306 | {24, 2}, /* last FP exception operand selector from npx */ | |
307 | {20, 4}, /* last FP exception operand offset from npx */ | |
308 | {18, 2} /* last FP opcode from npx */ | |
e49d4fa6 SS |
309 | }; |
310 | ||
311 | static struct | |
312 | { | |
313 | int go32_sig; | |
2ea28649 | 314 | enum gdb_signal gdb_sig; |
e49d4fa6 SS |
315 | } |
316 | sig_map[] = | |
317 | { | |
a493e3e2 PA |
318 | {0, GDB_SIGNAL_FPE}, |
319 | {1, GDB_SIGNAL_TRAP}, | |
53a5351d JM |
320 | /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL, |
321 | but I think SIGBUS is better, since the NMI is usually activated | |
322 | as a result of a memory parity check failure. */ | |
a493e3e2 PA |
323 | {2, GDB_SIGNAL_BUS}, |
324 | {3, GDB_SIGNAL_TRAP}, | |
325 | {4, GDB_SIGNAL_FPE}, | |
326 | {5, GDB_SIGNAL_SEGV}, | |
327 | {6, GDB_SIGNAL_ILL}, | |
328 | {7, GDB_SIGNAL_EMT}, /* no-coprocessor exception */ | |
329 | {8, GDB_SIGNAL_SEGV}, | |
330 | {9, GDB_SIGNAL_SEGV}, | |
331 | {10, GDB_SIGNAL_BUS}, | |
332 | {11, GDB_SIGNAL_SEGV}, | |
333 | {12, GDB_SIGNAL_SEGV}, | |
334 | {13, GDB_SIGNAL_SEGV}, | |
335 | {14, GDB_SIGNAL_SEGV}, | |
336 | {16, GDB_SIGNAL_FPE}, | |
337 | {17, GDB_SIGNAL_BUS}, | |
338 | {31, GDB_SIGNAL_ILL}, | |
339 | {0x1b, GDB_SIGNAL_INT}, | |
340 | {0x75, GDB_SIGNAL_FPE}, | |
341 | {0x78, GDB_SIGNAL_ALRM}, | |
342 | {0x79, GDB_SIGNAL_INT}, | |
343 | {0x7a, GDB_SIGNAL_QUIT}, | |
344 | {-1, GDB_SIGNAL_LAST} | |
e49d4fa6 SS |
345 | }; |
346 | ||
53a5351d | 347 | static struct { |
2ea28649 | 348 | enum gdb_signal gdb_sig; |
53a5351d JM |
349 | int djgpp_excepno; |
350 | } excepn_map[] = { | |
a493e3e2 PA |
351 | {GDB_SIGNAL_0, -1}, |
352 | {GDB_SIGNAL_ILL, 6}, /* Invalid Opcode */ | |
353 | {GDB_SIGNAL_EMT, 7}, /* triggers SIGNOFP */ | |
354 | {GDB_SIGNAL_SEGV, 13}, /* GPF */ | |
355 | {GDB_SIGNAL_BUS, 17}, /* Alignment Check */ | |
53a5351d JM |
356 | /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for |
357 | details. */ | |
a493e3e2 PA |
358 | {GDB_SIGNAL_TERM, 0x1b}, /* triggers Ctrl-Break type of SIGINT */ |
359 | {GDB_SIGNAL_FPE, 0x75}, | |
360 | {GDB_SIGNAL_INT, 0x79}, | |
361 | {GDB_SIGNAL_QUIT, 0x7a}, | |
362 | {GDB_SIGNAL_ALRM, 0x78}, /* triggers SIGTIMR */ | |
363 | {GDB_SIGNAL_PROF, 0x78}, | |
364 | {GDB_SIGNAL_LAST, -1} | |
53a5351d JM |
365 | }; |
366 | ||
e49d4fa6 | 367 | static void |
4d277981 | 368 | go32_open (char *name, int from_tty) |
e49d4fa6 | 369 | { |
53a5351d | 370 | printf_unfiltered ("Done. Use the \"run\" command to run the program.\n"); |
e49d4fa6 SS |
371 | } |
372 | ||
373 | static void | |
460014f5 | 374 | go32_close (void) |
e49d4fa6 SS |
375 | { |
376 | } | |
377 | ||
378 | static void | |
136d6dae | 379 | go32_attach (struct target_ops *ops, char *args, int from_tty) |
e49d4fa6 | 380 | { |
8a3fe4f8 | 381 | error (_("\ |
53a5351d | 382 | You cannot attach to a running program on this platform.\n\ |
8a3fe4f8 | 383 | Use the `run' command to run DJGPP programs.")); |
e49d4fa6 SS |
384 | } |
385 | ||
386 | static void | |
136d6dae | 387 | go32_detach (struct target_ops *ops, char *args, int from_tty) |
e49d4fa6 SS |
388 | { |
389 | } | |
390 | ||
391 | static int resume_is_step; | |
53a5351d | 392 | static int resume_signal = -1; |
e49d4fa6 SS |
393 | |
394 | static void | |
28439f5e | 395 | go32_resume (struct target_ops *ops, |
2ea28649 | 396 | ptid_t ptid, int step, enum gdb_signal siggnal) |
c5aa993b | 397 | { |
53a5351d JM |
398 | int i; |
399 | ||
c5aa993b | 400 | resume_is_step = step; |
53a5351d | 401 | |
a493e3e2 | 402 | if (siggnal != GDB_SIGNAL_0 && siggnal != GDB_SIGNAL_TRAP) |
53a5351d | 403 | { |
0fff5247 | 404 | for (i = 0, resume_signal = -1; |
a493e3e2 | 405 | excepn_map[i].gdb_sig != GDB_SIGNAL_LAST; i++) |
53a5351d JM |
406 | if (excepn_map[i].gdb_sig == siggnal) |
407 | { | |
408 | resume_signal = excepn_map[i].djgpp_excepno; | |
409 | break; | |
410 | } | |
411 | if (resume_signal == -1) | |
412 | printf_unfiltered ("Cannot deliver signal %s on this platform.\n", | |
2ea28649 | 413 | gdb_signal_to_name (siggnal)); |
53a5351d | 414 | } |
c5aa993b | 415 | } |
e49d4fa6 | 416 | |
53a5351d JM |
417 | static char child_cwd[FILENAME_MAX]; |
418 | ||
31616044 | 419 | static ptid_t |
117de6a9 | 420 | go32_wait (struct target_ops *ops, |
47608cb1 | 421 | ptid_t ptid, struct target_waitstatus *status, int options) |
e49d4fa6 SS |
422 | { |
423 | int i; | |
53a5351d | 424 | unsigned char saved_opcode; |
0fff5247 | 425 | unsigned long INT3_addr = 0; |
53a5351d | 426 | int stepping_over_INT = 0; |
e49d4fa6 | 427 | |
0963b4bd | 428 | a_tss.tss_eflags &= 0xfeff; /* Reset the single-step flag (TF). */ |
e49d4fa6 | 429 | if (resume_is_step) |
53a5351d JM |
430 | { |
431 | /* If the next instruction is INT xx or INTO, we need to handle | |
432 | them specially. Intel manuals say that these instructions | |
433 | reset the single-step flag (a.k.a. TF). However, it seems | |
434 | that, at least in the DPMI environment, and at least when | |
435 | stepping over the DPMI interrupt 31h, the problem is having | |
436 | TF set at all when INT 31h is executed: the debuggee either | |
437 | crashes (and takes the system with it) or is killed by a | |
438 | SIGTRAP. | |
439 | ||
440 | So we need to emulate single-step mode: we put an INT3 opcode | |
441 | right after the INT xx instruction, let the debuggee run | |
442 | until it hits INT3 and stops, then restore the original | |
443 | instruction which we overwrote with the INT3 opcode, and back | |
444 | up the debuggee's EIP to that instruction. */ | |
445 | read_child (a_tss.tss_eip, &saved_opcode, 1); | |
446 | if (saved_opcode == 0xCD || saved_opcode == 0xCE) | |
447 | { | |
448 | unsigned char INT3_opcode = 0xCC; | |
449 | ||
450 | INT3_addr | |
451 | = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1; | |
452 | stepping_over_INT = 1; | |
453 | read_child (INT3_addr, &saved_opcode, 1); | |
454 | write_child (INT3_addr, &INT3_opcode, 1); | |
455 | } | |
456 | else | |
457 | a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */ | |
458 | } | |
459 | ||
460 | /* The special value FFFFh in tss_trap indicates to run_child that | |
461 | tss_irqn holds a signal to be delivered to the debuggee. */ | |
462 | if (resume_signal <= -1) | |
463 | { | |
464 | a_tss.tss_trap = 0; | |
465 | a_tss.tss_irqn = 0xff; | |
466 | } | |
e49d4fa6 | 467 | else |
53a5351d | 468 | { |
0963b4bd | 469 | a_tss.tss_trap = 0xffff; /* run_child looks for this. */ |
53a5351d JM |
470 | a_tss.tss_irqn = resume_signal; |
471 | } | |
472 | ||
473 | /* The child might change working directory behind our back. The | |
474 | GDB users won't like the side effects of that when they work with | |
475 | relative file names, and GDB might be confused by its current | |
476 | directory not being in sync with the truth. So we always make a | |
477 | point of changing back to where GDB thinks is its cwd, when we | |
478 | return control to the debugger, but restore child's cwd before we | |
479 | run it. */ | |
3a45aed8 EZ |
480 | /* Initialize child_cwd, before the first call to run_child and not |
481 | in the initialization, so the child get also the changed directory | |
0963b4bd | 482 | set with the gdb-command "cd ..." */ |
3a45aed8 EZ |
483 | if (!*child_cwd) |
484 | /* Initialize child's cwd with the current one. */ | |
485 | getcwd (child_cwd, sizeof (child_cwd)); | |
4d277981 | 486 | |
53a5351d | 487 | chdir (child_cwd); |
e49d4fa6 | 488 | |
b83266a0 | 489 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 490 | load_npx (); |
b83266a0 | 491 | #endif |
e49d4fa6 | 492 | run_child (); |
b83266a0 | 493 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 494 | save_npx (); |
b83266a0 | 495 | #endif |
e49d4fa6 | 496 | |
53a5351d JM |
497 | /* Did we step over an INT xx instruction? */ |
498 | if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1) | |
499 | { | |
500 | /* Restore the original opcode. */ | |
0963b4bd | 501 | a_tss.tss_eip--; /* EIP points *after* the INT3 instruction. */ |
53a5351d JM |
502 | write_child (a_tss.tss_eip, &saved_opcode, 1); |
503 | /* Simulate a TRAP exception. */ | |
504 | a_tss.tss_irqn = 1; | |
505 | a_tss.tss_eflags |= 0x0100; | |
506 | } | |
507 | ||
508 | getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */ | |
509 | chdir (current_directory); | |
510 | ||
e49d4fa6 SS |
511 | if (a_tss.tss_irqn == 0x21) |
512 | { | |
513 | status->kind = TARGET_WAITKIND_EXITED; | |
514 | status->value.integer = a_tss.tss_eax & 0xff; | |
515 | } | |
516 | else | |
517 | { | |
a493e3e2 | 518 | status->value.sig = GDB_SIGNAL_UNKNOWN; |
e49d4fa6 SS |
519 | status->kind = TARGET_WAITKIND_STOPPED; |
520 | for (i = 0; sig_map[i].go32_sig != -1; i++) | |
521 | { | |
522 | if (a_tss.tss_irqn == sig_map[i].go32_sig) | |
523 | { | |
53a5351d | 524 | #if __DJGPP_MINOR__ < 3 |
e49d4fa6 | 525 | if ((status->value.sig = sig_map[i].gdb_sig) != |
a493e3e2 | 526 | GDB_SIGNAL_TRAP) |
e49d4fa6 | 527 | status->kind = TARGET_WAITKIND_SIGNALLED; |
53a5351d JM |
528 | #else |
529 | status->value.sig = sig_map[i].gdb_sig; | |
530 | #endif | |
e49d4fa6 SS |
531 | break; |
532 | } | |
533 | } | |
534 | } | |
31616044 | 535 | return pid_to_ptid (SOME_PID); |
e49d4fa6 SS |
536 | } |
537 | ||
538 | static void | |
56be3814 | 539 | fetch_register (struct regcache *regcache, int regno) |
e49d4fa6 | 540 | { |
9d0b3624 PA |
541 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
542 | if (regno < gdbarch_fp0_regnum (gdbarch)) | |
56be3814 | 543 | regcache_raw_supply (regcache, regno, |
23a6d369 | 544 | (char *) &a_tss + regno_mapping[regno].tss_ofs); |
0963b4bd MS |
545 | else if (i386_fp_regnum_p (gdbarch, regno) || i386_fpc_regnum_p (gdbarch, |
546 | regno)) | |
56be3814 | 547 | i387_supply_fsave (regcache, regno, &npx); |
89dea5aa EZ |
548 | else |
549 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 550 | _("Invalid register no. %d in fetch_register."), regno); |
89dea5aa | 551 | } |
e49d4fa6 | 552 | |
89dea5aa | 553 | static void |
28439f5e PA |
554 | go32_fetch_registers (struct target_ops *ops, |
555 | struct regcache *regcache, int regno) | |
89dea5aa EZ |
556 | { |
557 | if (regno >= 0) | |
56be3814 | 558 | fetch_register (regcache, regno); |
89dea5aa | 559 | else |
e49d4fa6 | 560 | { |
7067c689 UW |
561 | for (regno = 0; |
562 | regno < gdbarch_fp0_regnum (get_regcache_arch (regcache)); | |
563 | regno++) | |
56be3814 UW |
564 | fetch_register (regcache, regno); |
565 | i387_supply_fsave (regcache, -1, &npx); | |
e49d4fa6 SS |
566 | } |
567 | } | |
568 | ||
569 | static void | |
56be3814 | 570 | store_register (const struct regcache *regcache, int regno) |
e49d4fa6 | 571 | { |
9d0b3624 PA |
572 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
573 | if (regno < gdbarch_fp0_regnum (gdbarch)) | |
56be3814 | 574 | regcache_raw_collect (regcache, regno, |
822c9732 | 575 | (char *) &a_tss + regno_mapping[regno].tss_ofs); |
0963b4bd MS |
576 | else if (i386_fp_regnum_p (gdbarch, regno) || i386_fpc_regnum_p (gdbarch, |
577 | regno)) | |
56be3814 | 578 | i387_collect_fsave (regcache, regno, &npx); |
e49d4fa6 | 579 | else |
8e65ff28 | 580 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 581 | _("Invalid register no. %d in store_register."), regno); |
e49d4fa6 SS |
582 | } |
583 | ||
584 | static void | |
28439f5e PA |
585 | go32_store_registers (struct target_ops *ops, |
586 | struct regcache *regcache, int regno) | |
e49d4fa6 | 587 | { |
0fff5247 | 588 | unsigned r; |
e49d4fa6 SS |
589 | |
590 | if (regno >= 0) | |
56be3814 | 591 | store_register (regcache, regno); |
e49d4fa6 SS |
592 | else |
593 | { | |
7067c689 | 594 | for (r = 0; r < gdbarch_fp0_regnum (get_regcache_arch (regcache)); r++) |
56be3814 UW |
595 | store_register (regcache, r); |
596 | i387_collect_fsave (regcache, -1, &npx); | |
e49d4fa6 SS |
597 | } |
598 | } | |
599 | ||
600 | static void | |
316f2060 | 601 | go32_prepare_to_store (struct regcache *regcache) |
e49d4fa6 SS |
602 | { |
603 | } | |
604 | ||
605 | static int | |
9d0b3624 | 606 | go32_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, int write, |
4d277981 | 607 | struct mem_attrib *attrib, struct target_ops *target) |
e49d4fa6 SS |
608 | { |
609 | if (write) | |
610 | { | |
611 | if (write_child (memaddr, myaddr, len)) | |
612 | { | |
613 | return 0; | |
614 | } | |
615 | else | |
616 | { | |
617 | return len; | |
618 | } | |
619 | } | |
620 | else | |
621 | { | |
622 | if (read_child (memaddr, myaddr, len)) | |
623 | { | |
624 | return 0; | |
625 | } | |
626 | else | |
627 | { | |
628 | return len; | |
629 | } | |
630 | } | |
631 | } | |
632 | ||
0963b4bd | 633 | static cmdline_t child_cmd; /* Parsed child's command line kept here. */ |
53a5351d | 634 | |
e49d4fa6 | 635 | static void |
4d277981 | 636 | go32_files_info (struct target_ops *target) |
e49d4fa6 | 637 | { |
53a5351d | 638 | printf_unfiltered ("You are running a DJGPP V2 program.\n"); |
e49d4fa6 SS |
639 | } |
640 | ||
e49d4fa6 | 641 | static void |
7d85a9c0 | 642 | go32_kill_inferior (struct target_ops *ops) |
e49d4fa6 | 643 | { |
67ce33d7 | 644 | go32_mourn_inferior (ops); |
e49d4fa6 SS |
645 | } |
646 | ||
647 | static void | |
267fbcde JB |
648 | go32_create_inferior (struct target_ops *ops, char *exec_file, |
649 | char *args, char **env, int from_tty) | |
e49d4fa6 | 650 | { |
4d277981 | 651 | extern char **environ; |
e49d4fa6 SS |
652 | jmp_buf start_state; |
653 | char *cmdline; | |
654 | char **env_save = environ; | |
150985e3 | 655 | size_t cmdlen; |
6c95b8df | 656 | struct inferior *inf; |
e49d4fa6 | 657 | |
0fff5247 EZ |
658 | /* If no exec file handed to us, get it from the exec-file command -- with |
659 | a good, common error message if none is specified. */ | |
660 | if (exec_file == 0) | |
661 | exec_file = get_exec_file (1); | |
662 | ||
53a5351d JM |
663 | resume_signal = -1; |
664 | resume_is_step = 0; | |
3a45aed8 EZ |
665 | |
666 | /* Initialize child's cwd as empty to be initialized when starting | |
667 | the child. */ | |
668 | *child_cwd = 0; | |
669 | ||
53a5351d JM |
670 | /* Init command line storage. */ |
671 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 | 672 | internal_error (__FILE__, __LINE__, |
0963b4bd MS |
673 | _("Cannot allocate redirection storage: " |
674 | "not enough memory.\n")); | |
53a5351d JM |
675 | |
676 | /* Parse the command line and create redirections. */ | |
677 | if (strpbrk (args, "<>")) | |
678 | { | |
679 | if (redir_cmdline_parse (args, &child_cmd) == 0) | |
680 | args = child_cmd.command; | |
681 | else | |
8a3fe4f8 | 682 | error (_("Syntax error in command line.")); |
53a5351d JM |
683 | } |
684 | else | |
c2d11a7d | 685 | child_cmd.command = xstrdup (args); |
e49d4fa6 | 686 | |
150985e3 EZ |
687 | cmdlen = strlen (args); |
688 | /* v2loadimage passes command lines via DOS memory, so it cannot | |
689 | possibly handle commands longer than 1MB. */ | |
690 | if (cmdlen > 1024*1024) | |
8a3fe4f8 | 691 | error (_("Command line too long.")); |
150985e3 EZ |
692 | |
693 | cmdline = xmalloc (cmdlen + 4); | |
e49d4fa6 | 694 | strcpy (cmdline + 1, args); |
150985e3 EZ |
695 | /* If the command-line length fits into DOS 126-char limits, use the |
696 | DOS command tail format; otherwise, tell v2loadimage to pass it | |
697 | through a buffer in conventional memory. */ | |
698 | if (cmdlen < 127) | |
699 | { | |
700 | cmdline[0] = strlen (args); | |
701 | cmdline[cmdlen + 1] = 13; | |
702 | } | |
703 | else | |
0963b4bd | 704 | cmdline[0] = 0xff; /* Signal v2loadimage it's a long command. */ |
e49d4fa6 SS |
705 | |
706 | environ = env; | |
707 | ||
708 | if (v2loadimage (exec_file, cmdline, start_state)) | |
709 | { | |
710 | environ = env_save; | |
711 | printf_unfiltered ("Load failed for image %s\n", exec_file); | |
712 | exit (1); | |
713 | } | |
714 | environ = env_save; | |
12a498f3 | 715 | xfree (cmdline); |
e49d4fa6 SS |
716 | |
717 | edi_init (start_state); | |
53a5351d JM |
718 | #if __DJGPP_MINOR__ < 3 |
719 | save_npx (); | |
720 | #endif | |
e49d4fa6 | 721 | |
39f77062 | 722 | inferior_ptid = pid_to_ptid (SOME_PID); |
6c95b8df | 723 | inf = current_inferior (); |
20176d8f | 724 | inferior_appeared (inf, SOME_PID); |
7f9f62ba | 725 | |
e49d4fa6 | 726 | push_target (&go32_ops); |
444c3224 PA |
727 | |
728 | add_thread_silent (inferior_ptid); | |
729 | ||
e49d4fa6 SS |
730 | clear_proceed_status (); |
731 | insert_breakpoints (); | |
b83266a0 | 732 | prog_has_started = 1; |
e49d4fa6 SS |
733 | } |
734 | ||
735 | static void | |
136d6dae | 736 | go32_mourn_inferior (struct target_ops *ops) |
e49d4fa6 | 737 | { |
67ce33d7 PA |
738 | ptid_t ptid; |
739 | ||
740 | redir_cmdline_delete (&child_cmd); | |
741 | resume_signal = -1; | |
742 | resume_is_step = 0; | |
743 | ||
744 | cleanup_client (); | |
745 | ||
53a5351d JM |
746 | /* We need to make sure all the breakpoint enable bits in the DR7 |
747 | register are reset when the inferior exits. Otherwise, if they | |
748 | rerun the inferior, the uncleared bits may cause random SIGTRAPs, | |
749 | failure to set more watchpoints, and other calamities. It would | |
750 | be nice if GDB itself would take care to remove all breakpoints | |
751 | at all times, but it doesn't, probably under an assumption that | |
752 | the OS cleans up when the debuggee exits. */ | |
e24d4c64 | 753 | i386_cleanup_dregs (); |
67ce33d7 PA |
754 | |
755 | ptid = inferior_ptid; | |
756 | inferior_ptid = null_ptid; | |
757 | delete_thread_silent (ptid); | |
758 | prog_has_started = 0; | |
759 | ||
760 | unpush_target (ops); | |
e49d4fa6 SS |
761 | generic_mourn_inferior (); |
762 | } | |
763 | ||
764 | static int | |
765 | go32_can_run (void) | |
766 | { | |
767 | return 1; | |
768 | } | |
769 | ||
e49d4fa6 SS |
770 | /* Hardware watchpoint support. */ |
771 | ||
e49d4fa6 | 772 | #define D_REGS edi.dr |
e24d4c64 EZ |
773 | #define CONTROL D_REGS[7] |
774 | #define STATUS D_REGS[6] | |
53a5351d | 775 | |
e24d4c64 EZ |
776 | /* Pass the address ADDR to the inferior in the I'th debug register. |
777 | Here we just store the address in D_REGS, the watchpoint will be | |
778 | actually set up when go32_wait runs the debuggee. */ | |
9bb9e8ad | 779 | static void |
e24d4c64 | 780 | go32_set_dr (int i, CORE_ADDR addr) |
e49d4fa6 | 781 | { |
4d277981 EZ |
782 | if (i < 0 || i > 3) |
783 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 784 | _("Invalid register %d in go32_set_dr.\n"), i); |
e24d4c64 | 785 | D_REGS[i] = addr; |
e49d4fa6 SS |
786 | } |
787 | ||
e24d4c64 EZ |
788 | /* Pass the value VAL to the inferior in the DR7 debug control |
789 | register. Here we just store the address in D_REGS, the watchpoint | |
790 | will be actually set up when go32_wait runs the debuggee. */ | |
9bb9e8ad PM |
791 | static void |
792 | go32_set_dr7 (unsigned long val) | |
53a5351d | 793 | { |
e24d4c64 | 794 | CONTROL = val; |
53a5351d JM |
795 | } |
796 | ||
e24d4c64 EZ |
797 | /* Get the value of the DR6 debug status register from the inferior. |
798 | Here we just return the value stored in D_REGS, as we've got it | |
799 | from the last go32_wait call. */ | |
9bb9e8ad | 800 | static unsigned long |
e24d4c64 | 801 | go32_get_dr6 (void) |
e49d4fa6 | 802 | { |
e24d4c64 | 803 | return STATUS; |
e49d4fa6 SS |
804 | } |
805 | ||
7b50312a PA |
806 | /* Get the value of the DR7 debug status register from the inferior. |
807 | Here we just return the value stored in D_REGS, as we've got it | |
808 | from the last go32_wait call. */ | |
809 | ||
810 | static unsigned long | |
811 | go32_get_dr7 (void) | |
812 | { | |
813 | return CONTROL; | |
814 | } | |
815 | ||
816 | /* Get the value of the DR debug register I from the inferior. Here | |
817 | we just return the value stored in D_REGS, as we've got it from the | |
818 | last go32_wait call. */ | |
819 | ||
820 | static CORE_ADDR | |
821 | go32_get_dr (int i) | |
822 | { | |
823 | if (i < 0 || i > 3) | |
824 | internal_error (__FILE__, __LINE__, | |
825 | _("Invalid register %d in go32_get_dr.\n"), i); | |
826 | return D_REGS[i]; | |
827 | } | |
828 | ||
53a5351d JM |
829 | /* Put the device open on handle FD into either raw or cooked |
830 | mode, return 1 if it was in raw mode, zero otherwise. */ | |
831 | ||
832 | static int | |
833 | device_mode (int fd, int raw_p) | |
834 | { | |
835 | int oldmode, newmode; | |
836 | __dpmi_regs regs; | |
837 | ||
838 | regs.x.ax = 0x4400; | |
839 | regs.x.bx = fd; | |
840 | __dpmi_int (0x21, ®s); | |
841 | if (regs.x.flags & 1) | |
842 | return -1; | |
843 | newmode = oldmode = regs.x.dx; | |
844 | ||
845 | if (raw_p) | |
846 | newmode |= 0x20; | |
847 | else | |
848 | newmode &= ~0x20; | |
849 | ||
0963b4bd | 850 | if (oldmode & 0x80) /* Only for character dev. */ |
53a5351d JM |
851 | { |
852 | regs.x.ax = 0x4401; | |
853 | regs.x.bx = fd; | |
0963b4bd | 854 | regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails. */ |
53a5351d JM |
855 | __dpmi_int (0x21, ®s); |
856 | if (regs.x.flags & 1) | |
857 | return -1; | |
858 | } | |
859 | return (oldmode & 0x20) == 0x20; | |
860 | } | |
861 | ||
862 | ||
863 | static int inf_mode_valid = 0; | |
864 | static int inf_terminal_mode; | |
865 | ||
866 | /* This semaphore is needed because, amazingly enough, GDB calls | |
867 | target.to_terminal_ours more than once after the inferior stops. | |
868 | But we need the information from the first call only, since the | |
869 | second call will always see GDB's own cooked terminal. */ | |
870 | static int terminal_is_ours = 1; | |
871 | ||
cce74817 JM |
872 | static void |
873 | go32_terminal_init (void) | |
874 | { | |
0963b4bd | 875 | inf_mode_valid = 0; /* Reinitialize, in case they are restarting child. */ |
53a5351d | 876 | terminal_is_ours = 1; |
cce74817 JM |
877 | } |
878 | ||
879 | static void | |
503ebb2c | 880 | go32_terminal_info (const char *args, int from_tty) |
cce74817 | 881 | { |
53a5351d JM |
882 | printf_unfiltered ("Inferior's terminal is in %s mode.\n", |
883 | !inf_mode_valid | |
884 | ? "default" : inf_terminal_mode ? "raw" : "cooked"); | |
885 | ||
886 | #if __DJGPP_MINOR__ > 2 | |
887 | if (child_cmd.redirection) | |
888 | { | |
889 | int i; | |
890 | ||
891 | for (i = 0; i < DBG_HANDLES; i++) | |
c5aa993b | 892 | { |
53a5351d JM |
893 | if (child_cmd.redirection[i]->file_name) |
894 | printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n", | |
895 | i, child_cmd.redirection[i]->file_name); | |
896 | else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1) | |
897 | printf_unfiltered | |
898 | ("\tFile handle %d appears to be closed by inferior.\n", i); | |
899 | /* Mask off the raw/cooked bit when comparing device info words. */ | |
900 | else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf) | |
901 | != (_get_dev_info (i) & 0xdf)) | |
902 | printf_unfiltered | |
903 | ("\tFile handle %d appears to be redirected by inferior.\n", i); | |
c5aa993b | 904 | } |
53a5351d JM |
905 | } |
906 | #endif | |
907 | } | |
908 | ||
909 | static void | |
910 | go32_terminal_inferior (void) | |
911 | { | |
912 | /* Redirect standard handles as child wants them. */ | |
913 | errno = 0; | |
914 | if (redir_to_child (&child_cmd) == -1) | |
915 | { | |
916 | redir_to_debugger (&child_cmd); | |
8a3fe4f8 | 917 | error (_("Cannot redirect standard handles for program: %s."), |
dc672865 | 918 | safe_strerror (errno)); |
53a5351d | 919 | } |
0963b4bd MS |
920 | /* Set the console device of the inferior to whatever mode |
921 | (raw or cooked) we found it last time. */ | |
53a5351d JM |
922 | if (terminal_is_ours) |
923 | { | |
924 | if (inf_mode_valid) | |
925 | device_mode (0, inf_terminal_mode); | |
926 | terminal_is_ours = 0; | |
927 | } | |
cce74817 JM |
928 | } |
929 | ||
930 | static void | |
931 | go32_terminal_ours (void) | |
932 | { | |
53a5351d | 933 | /* Switch to cooked mode on the gdb terminal and save the inferior |
0963b4bd | 934 | terminal mode to be restored when it is resumed. */ |
53a5351d JM |
935 | if (!terminal_is_ours) |
936 | { | |
937 | inf_terminal_mode = device_mode (0, 0); | |
938 | if (inf_terminal_mode != -1) | |
939 | inf_mode_valid = 1; | |
940 | else | |
941 | /* If device_mode returned -1, we don't know what happens with | |
942 | handle 0 anymore, so make the info invalid. */ | |
943 | inf_mode_valid = 0; | |
944 | terminal_is_ours = 1; | |
945 | ||
946 | /* Restore debugger's standard handles. */ | |
947 | errno = 0; | |
948 | if (redir_to_debugger (&child_cmd) == -1) | |
949 | { | |
950 | redir_to_child (&child_cmd); | |
8a3fe4f8 | 951 | error (_("Cannot redirect standard handles for debugger: %s."), |
dc672865 | 952 | safe_strerror (errno)); |
53a5351d JM |
953 | } |
954 | } | |
cce74817 JM |
955 | } |
956 | ||
444c3224 | 957 | static int |
28439f5e | 958 | go32_thread_alive (struct target_ops *ops, ptid_t ptid) |
444c3224 | 959 | { |
89c9c2ec | 960 | return !ptid_equal (inferior_ptid, null_ptid); |
444c3224 PA |
961 | } |
962 | ||
963 | static char * | |
117de6a9 | 964 | go32_pid_to_str (struct target_ops *ops, ptid_t ptid) |
444c3224 | 965 | { |
89c9c2ec | 966 | return normal_pid_to_str (ptid); |
444c3224 PA |
967 | } |
968 | ||
e49d4fa6 SS |
969 | static void |
970 | init_go32_ops (void) | |
971 | { | |
972 | go32_ops.to_shortname = "djgpp"; | |
973 | go32_ops.to_longname = "djgpp target process"; | |
974 | go32_ops.to_doc = | |
975 | "Program loaded by djgpp, when gdb is used as an external debugger"; | |
976 | go32_ops.to_open = go32_open; | |
977 | go32_ops.to_close = go32_close; | |
53a5351d | 978 | go32_ops.to_attach = go32_attach; |
e49d4fa6 SS |
979 | go32_ops.to_detach = go32_detach; |
980 | go32_ops.to_resume = go32_resume; | |
981 | go32_ops.to_wait = go32_wait; | |
982 | go32_ops.to_fetch_registers = go32_fetch_registers; | |
983 | go32_ops.to_store_registers = go32_store_registers; | |
984 | go32_ops.to_prepare_to_store = go32_prepare_to_store; | |
c8e73a31 | 985 | go32_ops.deprecated_xfer_memory = go32_xfer_memory; |
e49d4fa6 SS |
986 | go32_ops.to_files_info = go32_files_info; |
987 | go32_ops.to_insert_breakpoint = memory_insert_breakpoint; | |
988 | go32_ops.to_remove_breakpoint = memory_remove_breakpoint; | |
cce74817 JM |
989 | go32_ops.to_terminal_init = go32_terminal_init; |
990 | go32_ops.to_terminal_inferior = go32_terminal_inferior; | |
53a5351d | 991 | go32_ops.to_terminal_ours_for_output = go32_terminal_ours; |
cce74817 | 992 | go32_ops.to_terminal_ours = go32_terminal_ours; |
53a5351d | 993 | go32_ops.to_terminal_info = go32_terminal_info; |
e49d4fa6 SS |
994 | go32_ops.to_kill = go32_kill_inferior; |
995 | go32_ops.to_create_inferior = go32_create_inferior; | |
996 | go32_ops.to_mourn_inferior = go32_mourn_inferior; | |
997 | go32_ops.to_can_run = go32_can_run; | |
444c3224 PA |
998 | go32_ops.to_thread_alive = go32_thread_alive; |
999 | go32_ops.to_pid_to_str = go32_pid_to_str; | |
e49d4fa6 | 1000 | go32_ops.to_stratum = process_stratum; |
c35b1492 PA |
1001 | go32_ops.to_has_all_memory = default_child_has_all_memory; |
1002 | go32_ops.to_has_memory = default_child_has_memory; | |
1003 | go32_ops.to_has_stack = default_child_has_stack; | |
1004 | go32_ops.to_has_registers = default_child_has_registers; | |
1005 | go32_ops.to_has_execution = default_child_has_execution; | |
5aca5a82 PM |
1006 | |
1007 | i386_use_watchpoints (&go32_ops); | |
1008 | ||
9bb9e8ad PM |
1009 | |
1010 | i386_dr_low.set_control = go32_set_dr7; | |
1011 | i386_dr_low.set_addr = go32_set_dr; | |
9bb9e8ad | 1012 | i386_dr_low.get_status = go32_get_dr6; |
7b50312a PA |
1013 | i386_dr_low.get_control = go32_get_dr7; |
1014 | i386_dr_low.get_addr = go32_get_dr; | |
9bb9e8ad PM |
1015 | i386_set_debug_register_length (4); |
1016 | ||
e49d4fa6 | 1017 | go32_ops.to_magic = OPS_MAGIC; |
53a5351d | 1018 | |
3a45aed8 EZ |
1019 | /* Initialize child's cwd as empty to be initialized when starting |
1020 | the child. */ | |
1021 | *child_cwd = 0; | |
53a5351d JM |
1022 | |
1023 | /* Initialize child's command line storage. */ | |
1024 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 | 1025 | internal_error (__FILE__, __LINE__, |
0963b4bd MS |
1026 | _("Cannot allocate redirection storage: " |
1027 | "not enough memory.\n")); | |
0fff5247 EZ |
1028 | |
1029 | /* We are always processing GCC-compiled programs. */ | |
1030 | processing_gcc_compilation = 2; | |
e49d4fa6 SS |
1031 | } |
1032 | ||
10085bb5 EZ |
1033 | /* Return the current DOS codepage number. */ |
1034 | static int | |
1035 | dos_codepage (void) | |
1036 | { | |
1037 | __dpmi_regs regs; | |
1038 | ||
1039 | regs.x.ax = 0x6601; | |
1040 | __dpmi_int (0x21, ®s); | |
1041 | if (!(regs.x.flags & 1)) | |
1042 | return regs.x.bx & 0xffff; | |
1043 | else | |
1044 | return 437; /* default */ | |
1045 | } | |
1046 | ||
1047 | /* Limited emulation of `nl_langinfo', for charset.c. */ | |
1048 | char * | |
1049 | nl_langinfo (nl_item item) | |
1050 | { | |
1051 | char *retval; | |
1052 | ||
1053 | switch (item) | |
1054 | { | |
1055 | case CODESET: | |
1056 | { | |
1057 | /* 8 is enough for SHORT_MAX + "CP" + null. */ | |
1058 | char buf[8]; | |
1059 | int blen = sizeof (buf); | |
1060 | int needed = snprintf (buf, blen, "CP%d", dos_codepage ()); | |
1061 | ||
0963b4bd | 1062 | if (needed > blen) /* Should never happen. */ |
10085bb5 EZ |
1063 | buf[0] = 0; |
1064 | retval = xstrdup (buf); | |
1065 | } | |
1066 | break; | |
1067 | default: | |
1068 | retval = xstrdup (""); | |
1069 | break; | |
1070 | } | |
1071 | return retval; | |
1072 | } | |
1073 | ||
10ba702d EZ |
1074 | unsigned short windows_major, windows_minor; |
1075 | ||
1076 | /* Compute the version Windows reports via Int 2Fh/AX=1600h. */ | |
1077 | static void | |
1078 | go32_get_windows_version(void) | |
1079 | { | |
1080 | __dpmi_regs r; | |
1081 | ||
1082 | r.x.ax = 0x1600; | |
1083 | __dpmi_int(0x2f, &r); | |
1084 | if (r.h.al > 2 && r.h.al != 0x80 && r.h.al != 0xff | |
1085 | && (r.h.al > 3 || r.h.ah > 0)) | |
1086 | { | |
1087 | windows_major = r.h.al; | |
1088 | windows_minor = r.h.ah; | |
1089 | } | |
1090 | else | |
1091 | windows_major = 0xff; /* meaning no Windows */ | |
1092 | } | |
1093 | ||
1094 | /* A subroutine of go32_sysinfo to display memory info. */ | |
1095 | static void | |
1096 | print_mem (unsigned long datum, const char *header, int in_pages_p) | |
1097 | { | |
1098 | if (datum != 0xffffffffUL) | |
1099 | { | |
1100 | if (in_pages_p) | |
1101 | datum <<= 12; | |
1102 | puts_filtered (header); | |
1103 | if (datum > 1024) | |
1104 | { | |
1105 | printf_filtered ("%lu KB", datum >> 10); | |
1106 | if (datum > 1024 * 1024) | |
1107 | printf_filtered (" (%lu MB)", datum >> 20); | |
1108 | } | |
1109 | else | |
1110 | printf_filtered ("%lu Bytes", datum); | |
1111 | puts_filtered ("\n"); | |
1112 | } | |
1113 | } | |
1114 | ||
1115 | /* Display assorted information about the underlying OS. */ | |
1116 | static void | |
1117 | go32_sysinfo (char *arg, int from_tty) | |
1118 | { | |
d647eed6 EZ |
1119 | static const char test_pattern[] = |
1120 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf" | |
1121 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf" | |
1122 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeafdeadbeaf"; | |
10ba702d EZ |
1123 | struct utsname u; |
1124 | char cpuid_vendor[13]; | |
1125 | unsigned cpuid_max = 0, cpuid_eax, cpuid_ebx, cpuid_ecx, cpuid_edx; | |
1126 | unsigned true_dos_version = _get_dos_version (1); | |
1127 | unsigned advertized_dos_version = ((unsigned int)_osmajor << 8) | _osminor; | |
1128 | int dpmi_flags; | |
1129 | char dpmi_vendor_info[129]; | |
d647eed6 | 1130 | int dpmi_vendor_available; |
10ba702d EZ |
1131 | __dpmi_version_ret dpmi_version_data; |
1132 | long eflags; | |
1133 | __dpmi_free_mem_info mem_info; | |
1134 | __dpmi_regs regs; | |
1135 | ||
1136 | cpuid_vendor[0] = '\0'; | |
1137 | if (uname (&u)) | |
1138 | strcpy (u.machine, "Unknown x86"); | |
1139 | else if (u.machine[0] == 'i' && u.machine[1] > 4) | |
1140 | { | |
1141 | /* CPUID with EAX = 0 returns the Vendor ID. */ | |
4d157a3d MF |
1142 | #if 0 |
1143 | /* Ideally we would use i386_cpuid(), but it needs someone to run | |
1144 | native tests first to make sure things actually work. They should. | |
1145 | http://sourceware.org/ml/gdb-patches/2013-05/msg00164.html */ | |
1146 | unsigned int eax, ebx, ecx, edx; | |
1147 | ||
1148 | if (i386_cpuid (0, &eax, &ebx, &ecx, &edx)) | |
1149 | { | |
1150 | cpuid_max = eax; | |
1151 | memcpy (&vendor[0], &ebx, 4); | |
1152 | memcpy (&vendor[4], &ecx, 4); | |
1153 | memcpy (&vendor[8], &edx, 4); | |
1154 | cpuid_vendor[12] = '\0'; | |
1155 | } | |
1156 | #else | |
10ba702d EZ |
1157 | __asm__ __volatile__ ("xorl %%ebx, %%ebx;" |
1158 | "xorl %%ecx, %%ecx;" | |
1159 | "xorl %%edx, %%edx;" | |
1160 | "movl $0, %%eax;" | |
1161 | "cpuid;" | |
1162 | "movl %%ebx, %0;" | |
1163 | "movl %%edx, %1;" | |
1164 | "movl %%ecx, %2;" | |
1165 | "movl %%eax, %3;" | |
1166 | : "=m" (cpuid_vendor[0]), | |
1167 | "=m" (cpuid_vendor[4]), | |
1168 | "=m" (cpuid_vendor[8]), | |
1169 | "=m" (cpuid_max) | |
1170 | : | |
1171 | : "%eax", "%ebx", "%ecx", "%edx"); | |
1172 | cpuid_vendor[12] = '\0'; | |
4d157a3d | 1173 | #endif |
10ba702d EZ |
1174 | } |
1175 | ||
1176 | printf_filtered ("CPU Type.......................%s", u.machine); | |
1177 | if (cpuid_vendor[0]) | |
1178 | printf_filtered (" (%s)", cpuid_vendor); | |
1179 | puts_filtered ("\n"); | |
1180 | ||
1181 | /* CPUID with EAX = 1 returns processor signature and features. */ | |
1182 | if (cpuid_max >= 1) | |
1183 | { | |
1184 | static char *brand_name[] = { | |
1185 | "", | |
1186 | " Celeron", | |
1187 | " III", | |
1188 | " III Xeon", | |
1189 | "", "", "", "", | |
1190 | " 4" | |
1191 | }; | |
1192 | char cpu_string[80]; | |
1193 | char cpu_brand[20]; | |
1194 | unsigned brand_idx; | |
1195 | int intel_p = strcmp (cpuid_vendor, "GenuineIntel") == 0; | |
1196 | int amd_p = strcmp (cpuid_vendor, "AuthenticAMD") == 0; | |
1197 | unsigned cpu_family, cpu_model; | |
1198 | ||
4d157a3d MF |
1199 | #if 0 |
1200 | /* See comment above about cpuid usage. */ | |
1201 | i386_cpuid (1, &cpuid_eax, &cpuid_ebx, NULL, &cpuid_edx); | |
1202 | #else | |
10ba702d EZ |
1203 | __asm__ __volatile__ ("movl $1, %%eax;" |
1204 | "cpuid;" | |
1205 | : "=a" (cpuid_eax), | |
1206 | "=b" (cpuid_ebx), | |
1207 | "=d" (cpuid_edx) | |
1208 | : | |
1209 | : "%ecx"); | |
4d157a3d | 1210 | #endif |
10ba702d EZ |
1211 | brand_idx = cpuid_ebx & 0xff; |
1212 | cpu_family = (cpuid_eax >> 8) & 0xf; | |
1213 | cpu_model = (cpuid_eax >> 4) & 0xf; | |
1214 | cpu_brand[0] = '\0'; | |
1215 | if (intel_p) | |
1216 | { | |
1217 | if (brand_idx > 0 | |
1218 | && brand_idx < sizeof(brand_name)/sizeof(brand_name[0]) | |
1219 | && *brand_name[brand_idx]) | |
1220 | strcpy (cpu_brand, brand_name[brand_idx]); | |
1221 | else if (cpu_family == 5) | |
1222 | { | |
1223 | if (((cpuid_eax >> 12) & 3) == 0 && cpu_model == 4) | |
1224 | strcpy (cpu_brand, " MMX"); | |
1225 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 1) | |
1226 | strcpy (cpu_brand, " OverDrive"); | |
1227 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 2) | |
1228 | strcpy (cpu_brand, " Dual"); | |
1229 | } | |
1230 | else if (cpu_family == 6 && cpu_model < 8) | |
1231 | { | |
1232 | switch (cpu_model) | |
1233 | { | |
1234 | case 1: | |
1235 | strcpy (cpu_brand, " Pro"); | |
1236 | break; | |
1237 | case 3: | |
1238 | strcpy (cpu_brand, " II"); | |
1239 | break; | |
1240 | case 5: | |
1241 | strcpy (cpu_brand, " II Xeon"); | |
1242 | break; | |
1243 | case 6: | |
1244 | strcpy (cpu_brand, " Celeron"); | |
1245 | break; | |
1246 | case 7: | |
1247 | strcpy (cpu_brand, " III"); | |
1248 | break; | |
1249 | } | |
1250 | } | |
1251 | } | |
1252 | else if (amd_p) | |
1253 | { | |
1254 | switch (cpu_family) | |
1255 | { | |
1256 | case 4: | |
1257 | strcpy (cpu_brand, "486/5x86"); | |
1258 | break; | |
1259 | case 5: | |
1260 | switch (cpu_model) | |
1261 | { | |
1262 | case 0: | |
1263 | case 1: | |
1264 | case 2: | |
1265 | case 3: | |
1266 | strcpy (cpu_brand, "-K5"); | |
1267 | break; | |
1268 | case 6: | |
1269 | case 7: | |
1270 | strcpy (cpu_brand, "-K6"); | |
1271 | break; | |
1272 | case 8: | |
1273 | strcpy (cpu_brand, "-K6-2"); | |
1274 | break; | |
1275 | case 9: | |
1276 | strcpy (cpu_brand, "-K6-III"); | |
1277 | break; | |
1278 | } | |
1279 | break; | |
1280 | case 6: | |
1281 | switch (cpu_model) | |
1282 | { | |
1283 | case 1: | |
1284 | case 2: | |
1285 | case 4: | |
1286 | strcpy (cpu_brand, " Athlon"); | |
1287 | break; | |
1288 | case 3: | |
1289 | strcpy (cpu_brand, " Duron"); | |
1290 | break; | |
1291 | } | |
1292 | break; | |
1293 | } | |
1294 | } | |
8c042590 PM |
1295 | xsnprintf (cpu_string, sizeof (cpu_string), "%s%s Model %d Stepping %d", |
1296 | intel_p ? "Pentium" : (amd_p ? "AMD" : "ix86"), | |
1297 | cpu_brand, cpu_model, cpuid_eax & 0xf); | |
10ba702d EZ |
1298 | printfi_filtered (31, "%s\n", cpu_string); |
1299 | if (((cpuid_edx & (6 | (0x0d << 23))) != 0) | |
1300 | || ((cpuid_edx & 1) == 0) | |
1301 | || (amd_p && (cpuid_edx & (3 << 30)) != 0)) | |
1302 | { | |
1303 | puts_filtered ("CPU Features..................."); | |
1304 | /* We only list features which might be useful in the DPMI | |
1305 | environment. */ | |
1306 | if ((cpuid_edx & 1) == 0) | |
0963b4bd | 1307 | puts_filtered ("No FPU "); /* It's unusual to not have an FPU. */ |
10ba702d EZ |
1308 | if ((cpuid_edx & (1 << 1)) != 0) |
1309 | puts_filtered ("VME "); | |
1310 | if ((cpuid_edx & (1 << 2)) != 0) | |
1311 | puts_filtered ("DE "); | |
1312 | if ((cpuid_edx & (1 << 4)) != 0) | |
1313 | puts_filtered ("TSC "); | |
1314 | if ((cpuid_edx & (1 << 23)) != 0) | |
1315 | puts_filtered ("MMX "); | |
1316 | if ((cpuid_edx & (1 << 25)) != 0) | |
1317 | puts_filtered ("SSE "); | |
1318 | if ((cpuid_edx & (1 << 26)) != 0) | |
1319 | puts_filtered ("SSE2 "); | |
1320 | if (amd_p) | |
1321 | { | |
1322 | if ((cpuid_edx & (1 << 31)) != 0) | |
1323 | puts_filtered ("3DNow! "); | |
1324 | if ((cpuid_edx & (1 << 30)) != 0) | |
1325 | puts_filtered ("3DNow!Ext"); | |
1326 | } | |
1327 | puts_filtered ("\n"); | |
1328 | } | |
1329 | } | |
1330 | puts_filtered ("\n"); | |
1331 | printf_filtered ("DOS Version....................%s %s.%s", | |
1332 | _os_flavor, u.release, u.version); | |
1333 | if (true_dos_version != advertized_dos_version) | |
1334 | printf_filtered (" (disguised as v%d.%d)", _osmajor, _osminor); | |
1335 | puts_filtered ("\n"); | |
1336 | if (!windows_major) | |
1337 | go32_get_windows_version (); | |
1338 | if (windows_major != 0xff) | |
1339 | { | |
1340 | const char *windows_flavor; | |
1341 | ||
1342 | printf_filtered ("Windows Version................%d.%02d (Windows ", | |
1343 | windows_major, windows_minor); | |
1344 | switch (windows_major) | |
1345 | { | |
1346 | case 3: | |
1347 | windows_flavor = "3.X"; | |
1348 | break; | |
1349 | case 4: | |
1350 | switch (windows_minor) | |
1351 | { | |
1352 | case 0: | |
1353 | windows_flavor = "95, 95A, or 95B"; | |
1354 | break; | |
1355 | case 3: | |
1356 | windows_flavor = "95B OSR2.1 or 95C OSR2.5"; | |
1357 | break; | |
1358 | case 10: | |
1359 | windows_flavor = "98 or 98 SE"; | |
1360 | break; | |
1361 | case 90: | |
1362 | windows_flavor = "ME"; | |
1363 | break; | |
1364 | default: | |
1365 | windows_flavor = "9X"; | |
1366 | break; | |
1367 | } | |
1368 | break; | |
1369 | default: | |
1370 | windows_flavor = "??"; | |
1371 | break; | |
1372 | } | |
1373 | printf_filtered ("%s)\n", windows_flavor); | |
1374 | } | |
1375 | else if (true_dos_version == 0x532 && advertized_dos_version == 0x500) | |
0963b4bd MS |
1376 | printf_filtered ("Windows Version................" |
1377 | "Windows NT family (W2K/XP/W2K3/Vista/W2K8)\n"); | |
10ba702d | 1378 | puts_filtered ("\n"); |
d647eed6 EZ |
1379 | /* On some versions of Windows, __dpmi_get_capabilities returns |
1380 | zero, but the buffer is not filled with info, so we fill the | |
1381 | buffer with a known pattern and test for it afterwards. */ | |
1382 | memcpy (dpmi_vendor_info, test_pattern, sizeof(dpmi_vendor_info)); | |
1383 | dpmi_vendor_available = | |
1384 | __dpmi_get_capabilities (&dpmi_flags, dpmi_vendor_info); | |
1385 | if (dpmi_vendor_available == 0 | |
1386 | && memcmp (dpmi_vendor_info, test_pattern, | |
1387 | sizeof(dpmi_vendor_info)) != 0) | |
10ba702d EZ |
1388 | { |
1389 | /* The DPMI spec says the vendor string should be ASCIIZ, but | |
1390 | I don't trust the vendors to follow that... */ | |
1391 | if (!memchr (&dpmi_vendor_info[2], 0, 126)) | |
1392 | dpmi_vendor_info[128] = '\0'; | |
0963b4bd MS |
1393 | printf_filtered ("DPMI Host......................" |
1394 | "%s v%d.%d (capabilities: %#x)\n", | |
10ba702d EZ |
1395 | &dpmi_vendor_info[2], |
1396 | (unsigned)dpmi_vendor_info[0], | |
1397 | (unsigned)dpmi_vendor_info[1], | |
1398 | ((unsigned)dpmi_flags & 0x7f)); | |
1399 | } | |
d647eed6 EZ |
1400 | else |
1401 | printf_filtered ("DPMI Host......................(Info not available)\n"); | |
10ba702d EZ |
1402 | __dpmi_get_version (&dpmi_version_data); |
1403 | printf_filtered ("DPMI Version...................%d.%02d\n", | |
1404 | dpmi_version_data.major, dpmi_version_data.minor); | |
0963b4bd MS |
1405 | printf_filtered ("DPMI Info......................" |
1406 | "%s-bit DPMI, with%s Virtual Memory support\n", | |
10ba702d EZ |
1407 | (dpmi_version_data.flags & 1) ? "32" : "16", |
1408 | (dpmi_version_data.flags & 4) ? "" : "out"); | |
1409 | printfi_filtered (31, "Interrupts reflected to %s mode\n", | |
1410 | (dpmi_version_data.flags & 2) ? "V86" : "Real"); | |
1411 | printfi_filtered (31, "Processor type: i%d86\n", | |
1412 | dpmi_version_data.cpu); | |
1413 | printfi_filtered (31, "PIC base interrupt: Master: %#x Slave: %#x\n", | |
1414 | dpmi_version_data.master_pic, dpmi_version_data.slave_pic); | |
1415 | ||
1416 | /* a_tss is only initialized when the debuggee is first run. */ | |
1417 | if (prog_has_started) | |
1418 | { | |
1419 | __asm__ __volatile__ ("pushfl ; popl %0" : "=g" (eflags)); | |
0963b4bd MS |
1420 | printf_filtered ("Protection....................." |
1421 | "Ring %d (in %s), with%s I/O protection\n", | |
10ba702d EZ |
1422 | a_tss.tss_cs & 3, (a_tss.tss_cs & 4) ? "LDT" : "GDT", |
1423 | (a_tss.tss_cs & 3) > ((eflags >> 12) & 3) ? "" : "out"); | |
1424 | } | |
1425 | puts_filtered ("\n"); | |
1426 | __dpmi_get_free_memory_information (&mem_info); | |
1427 | print_mem (mem_info.total_number_of_physical_pages, | |
1428 | "DPMI Total Physical Memory.....", 1); | |
1429 | print_mem (mem_info.total_number_of_free_pages, | |
1430 | "DPMI Free Physical Memory......", 1); | |
1431 | print_mem (mem_info.size_of_paging_file_partition_in_pages, | |
1432 | "DPMI Swap Space................", 1); | |
1433 | print_mem (mem_info.linear_address_space_size_in_pages, | |
1434 | "DPMI Total Linear Address Size.", 1); | |
1435 | print_mem (mem_info.free_linear_address_space_in_pages, | |
1436 | "DPMI Free Linear Address Size..", 1); | |
1437 | print_mem (mem_info.largest_available_free_block_in_bytes, | |
1438 | "DPMI Largest Free Memory Block.", 0); | |
1439 | ||
1440 | regs.h.ah = 0x48; | |
1441 | regs.x.bx = 0xffff; | |
1442 | __dpmi_int (0x21, ®s); | |
1443 | print_mem (regs.x.bx << 4, "Free DOS Memory................", 0); | |
1444 | regs.x.ax = 0x5800; | |
1445 | __dpmi_int (0x21, ®s); | |
1446 | if ((regs.x.flags & 1) == 0) | |
1447 | { | |
1448 | static const char *dos_hilo[] = { | |
1449 | "Low", "", "", "", "High", "", "", "", "High, then Low" | |
1450 | }; | |
1451 | static const char *dos_fit[] = { | |
1452 | "First", "Best", "Last" | |
1453 | }; | |
1454 | int hilo_idx = (regs.x.ax >> 4) & 0x0f; | |
1455 | int fit_idx = regs.x.ax & 0x0f; | |
1456 | ||
1457 | if (hilo_idx > 8) | |
1458 | hilo_idx = 0; | |
1459 | if (fit_idx > 2) | |
1460 | fit_idx = 0; | |
1461 | printf_filtered ("DOS Memory Allocation..........%s memory, %s fit\n", | |
1462 | dos_hilo[hilo_idx], dos_fit[fit_idx]); | |
1463 | regs.x.ax = 0x5802; | |
1464 | __dpmi_int (0x21, ®s); | |
1465 | if ((regs.x.flags & 1) != 0) | |
1466 | regs.h.al = 0; | |
1467 | printfi_filtered (31, "UMBs %sin DOS memory chain\n", | |
1468 | regs.h.al == 0 ? "not " : ""); | |
1469 | } | |
1470 | } | |
1471 | ||
1472 | struct seg_descr { | |
9d0b3624 PA |
1473 | unsigned short limit0; |
1474 | unsigned short base0; | |
1475 | unsigned char base1; | |
1476 | unsigned stype:5; | |
1477 | unsigned dpl:2; | |
1478 | unsigned present:1; | |
1479 | unsigned limit1:4; | |
1480 | unsigned available:1; | |
1481 | unsigned dummy:1; | |
1482 | unsigned bit32:1; | |
1483 | unsigned page_granular:1; | |
1484 | unsigned char base2; | |
1485 | } __attribute__ ((packed)); | |
10ba702d EZ |
1486 | |
1487 | struct gate_descr { | |
9d0b3624 PA |
1488 | unsigned short offset0; |
1489 | unsigned short selector; | |
1490 | unsigned param_count:5; | |
1491 | unsigned dummy:3; | |
1492 | unsigned stype:5; | |
1493 | unsigned dpl:2; | |
1494 | unsigned present:1; | |
1495 | unsigned short offset1; | |
1496 | } __attribute__ ((packed)); | |
10ba702d EZ |
1497 | |
1498 | /* Read LEN bytes starting at logical address ADDR, and put the result | |
1499 | into DEST. Return 1 if success, zero if not. */ | |
1500 | static int | |
1501 | read_memory_region (unsigned long addr, void *dest, size_t len) | |
1502 | { | |
1503 | unsigned long dos_ds_limit = __dpmi_get_segment_limit (_dos_ds); | |
9f20bf26 | 1504 | int retval = 1; |
10ba702d EZ |
1505 | |
1506 | /* For the low memory, we can simply use _dos_ds. */ | |
1507 | if (addr <= dos_ds_limit - len) | |
1508 | dosmemget (addr, len, dest); | |
1509 | else | |
1510 | { | |
1511 | /* For memory above 1MB we need to set up a special segment to | |
1512 | be able to access that memory. */ | |
1513 | int sel = __dpmi_allocate_ldt_descriptors (1); | |
1514 | ||
9f20bf26 EZ |
1515 | if (sel <= 0) |
1516 | retval = 0; | |
1517 | else | |
1518 | { | |
1519 | int access_rights = __dpmi_get_descriptor_access_rights (sel); | |
1520 | size_t segment_limit = len - 1; | |
1521 | ||
1522 | /* Make sure the crucial bits in the descriptor access | |
1523 | rights are set correctly. Some DPMI providers might barf | |
1524 | if we set the segment limit to something that is not an | |
1525 | integral multiple of 4KB pages if the granularity bit is | |
1526 | not set to byte-granular, even though the DPMI spec says | |
1527 | it's the host's responsibility to set that bit correctly. */ | |
1528 | if (len > 1024 * 1024) | |
1529 | { | |
1530 | access_rights |= 0x8000; | |
1531 | /* Page-granular segments should have the low 12 bits of | |
1532 | the limit set. */ | |
1533 | segment_limit |= 0xfff; | |
1534 | } | |
1535 | else | |
1536 | access_rights &= ~0x8000; | |
1537 | ||
1538 | if (__dpmi_set_segment_base_address (sel, addr) != -1 | |
1539 | && __dpmi_set_descriptor_access_rights (sel, access_rights) != -1 | |
2033c18a EZ |
1540 | && __dpmi_set_segment_limit (sel, segment_limit) != -1 |
1541 | /* W2K silently fails to set the segment limit, leaving | |
1542 | it at zero; this test avoids the resulting crash. */ | |
1543 | && __dpmi_get_segment_limit (sel) >= segment_limit) | |
9f20bf26 EZ |
1544 | movedata (sel, 0, _my_ds (), (unsigned)dest, len); |
1545 | else | |
1546 | retval = 0; | |
1547 | ||
1548 | __dpmi_free_ldt_descriptor (sel); | |
1549 | } | |
10ba702d | 1550 | } |
9f20bf26 | 1551 | return retval; |
10ba702d EZ |
1552 | } |
1553 | ||
1554 | /* Get a segment descriptor stored at index IDX in the descriptor | |
1555 | table whose base address is TABLE_BASE. Return the descriptor | |
1556 | type, or -1 if failure. */ | |
1557 | static int | |
1558 | get_descriptor (unsigned long table_base, int idx, void *descr) | |
1559 | { | |
1560 | unsigned long addr = table_base + idx * 8; /* 8 bytes per entry */ | |
1561 | ||
1562 | if (read_memory_region (addr, descr, 8)) | |
1563 | return (int)((struct seg_descr *)descr)->stype; | |
1564 | return -1; | |
1565 | } | |
1566 | ||
1567 | struct dtr_reg { | |
1568 | unsigned short limit __attribute__((packed)); | |
1569 | unsigned long base __attribute__((packed)); | |
1570 | }; | |
1571 | ||
1572 | /* Display a segment descriptor stored at index IDX in a descriptor | |
1573 | table whose type is TYPE and whose base address is BASE_ADDR. If | |
1574 | FORCE is non-zero, display even invalid descriptors. */ | |
1575 | static void | |
1576 | display_descriptor (unsigned type, unsigned long base_addr, int idx, int force) | |
1577 | { | |
1578 | struct seg_descr descr; | |
1579 | struct gate_descr gate; | |
1580 | ||
1581 | /* Get the descriptor from the table. */ | |
1582 | if (idx == 0 && type == 0) | |
1583 | puts_filtered ("0x000: null descriptor\n"); | |
1584 | else if (get_descriptor (base_addr, idx, &descr) != -1) | |
1585 | { | |
1586 | /* For each type of descriptor table, this has a bit set if the | |
1587 | corresponding type of selectors is valid in that table. */ | |
1588 | static unsigned allowed_descriptors[] = { | |
1589 | 0xffffdafeL, /* GDT */ | |
1590 | 0x0000c0e0L, /* IDT */ | |
1591 | 0xffffdafaL /* LDT */ | |
1592 | }; | |
1593 | ||
1594 | /* If the program hasn't started yet, assume the debuggee will | |
1595 | have the same CPL as the debugger. */ | |
1596 | int cpl = prog_has_started ? (a_tss.tss_cs & 3) : _my_cs () & 3; | |
1597 | unsigned long limit = (descr.limit1 << 16) | descr.limit0; | |
1598 | ||
1599 | if (descr.present | |
1600 | && (allowed_descriptors[type] & (1 << descr.stype)) != 0) | |
1601 | { | |
1602 | printf_filtered ("0x%03x: ", | |
1603 | type == 1 | |
1604 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); | |
1605 | if (descr.page_granular) | |
1606 | limit = (limit << 12) | 0xfff; /* big segment: low 12 bit set */ | |
1607 | if (descr.stype == 1 || descr.stype == 2 || descr.stype == 3 | |
1608 | || descr.stype == 9 || descr.stype == 11 | |
1609 | || (descr.stype >= 16 && descr.stype < 32)) | |
1610 | printf_filtered ("base=0x%02x%02x%04x limit=0x%08lx", | |
1611 | descr.base2, descr.base1, descr.base0, limit); | |
1612 | ||
1613 | switch (descr.stype) | |
1614 | { | |
1615 | case 1: | |
1616 | case 3: | |
1617 | printf_filtered (" 16-bit TSS (task %sactive)", | |
1618 | descr.stype == 3 ? "" : "in"); | |
1619 | break; | |
1620 | case 2: | |
1621 | puts_filtered (" LDT"); | |
1622 | break; | |
1623 | case 4: | |
1624 | memcpy (&gate, &descr, sizeof gate); | |
1625 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1626 | gate.selector, gate.offset1, gate.offset0); | |
1627 | printf_filtered (" 16-bit Call Gate (params=%d)", | |
1628 | gate.param_count); | |
1629 | break; | |
1630 | case 5: | |
1631 | printf_filtered ("TSS selector=0x%04x", descr.base0); | |
1632 | printfi_filtered (16, "Task Gate"); | |
1633 | break; | |
1634 | case 6: | |
1635 | case 7: | |
1636 | memcpy (&gate, &descr, sizeof gate); | |
1637 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1638 | gate.selector, gate.offset1, gate.offset0); | |
1639 | printf_filtered (" 16-bit %s Gate", | |
1640 | descr.stype == 6 ? "Interrupt" : "Trap"); | |
1641 | break; | |
1642 | case 9: | |
1643 | case 11: | |
1644 | printf_filtered (" 32-bit TSS (task %sactive)", | |
1645 | descr.stype == 3 ? "" : "in"); | |
1646 | break; | |
1647 | case 12: | |
1648 | memcpy (&gate, &descr, sizeof gate); | |
1649 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1650 | gate.selector, gate.offset1, gate.offset0); | |
1651 | printf_filtered (" 32-bit Call Gate (params=%d)", | |
1652 | gate.param_count); | |
1653 | break; | |
1654 | case 14: | |
1655 | case 15: | |
1656 | memcpy (&gate, &descr, sizeof gate); | |
1657 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1658 | gate.selector, gate.offset1, gate.offset0); | |
1659 | printf_filtered (" 32-bit %s Gate", | |
1660 | descr.stype == 14 ? "Interrupt" : "Trap"); | |
1661 | break; | |
1662 | case 16: /* data segments */ | |
1663 | case 17: | |
1664 | case 18: | |
1665 | case 19: | |
1666 | case 20: | |
1667 | case 21: | |
1668 | case 22: | |
1669 | case 23: | |
1670 | printf_filtered (" %s-bit Data (%s Exp-%s%s)", | |
1671 | descr.bit32 ? "32" : "16", | |
0963b4bd MS |
1672 | descr.stype & 2 |
1673 | ? "Read/Write," : "Read-Only, ", | |
10ba702d EZ |
1674 | descr.stype & 4 ? "down" : "up", |
1675 | descr.stype & 1 ? "" : ", N.Acc"); | |
1676 | break; | |
1677 | case 24: /* code segments */ | |
1678 | case 25: | |
1679 | case 26: | |
1680 | case 27: | |
1681 | case 28: | |
1682 | case 29: | |
1683 | case 30: | |
1684 | case 31: | |
1685 | printf_filtered (" %s-bit Code (%s, %sConf%s)", | |
1686 | descr.bit32 ? "32" : "16", | |
1687 | descr.stype & 2 ? "Exec/Read" : "Exec-Only", | |
1688 | descr.stype & 4 ? "" : "N.", | |
1689 | descr.stype & 1 ? "" : ", N.Acc"); | |
1690 | break; | |
1691 | default: | |
1692 | printf_filtered ("Unknown type 0x%02x", descr.stype); | |
1693 | break; | |
1694 | } | |
1695 | puts_filtered ("\n"); | |
1696 | } | |
1697 | else if (force) | |
1698 | { | |
1699 | printf_filtered ("0x%03x: ", | |
1700 | type == 1 | |
1701 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); | |
1702 | if (!descr.present) | |
1703 | puts_filtered ("Segment not present\n"); | |
1704 | else | |
1705 | printf_filtered ("Segment type 0x%02x is invalid in this table\n", | |
1706 | descr.stype); | |
1707 | } | |
1708 | } | |
1709 | else if (force) | |
1710 | printf_filtered ("0x%03x: Cannot read this descriptor\n", idx); | |
1711 | } | |
1712 | ||
1713 | static void | |
1714 | go32_sldt (char *arg, int from_tty) | |
1715 | { | |
1716 | struct dtr_reg gdtr; | |
1717 | unsigned short ldtr = 0; | |
1718 | int ldt_idx; | |
1719 | struct seg_descr ldt_descr; | |
1720 | long ldt_entry = -1L; | |
1721 | int cpl = (prog_has_started ? a_tss.tss_cs : _my_cs ()) & 3; | |
1722 | ||
1723 | if (arg && *arg) | |
1724 | { | |
529480d0 | 1725 | arg = skip_spaces (arg); |
10ba702d EZ |
1726 | |
1727 | if (*arg) | |
1728 | { | |
1729 | ldt_entry = parse_and_eval_long (arg); | |
1730 | if (ldt_entry < 0 | |
1731 | || (ldt_entry & 4) == 0 | |
1732 | || (ldt_entry & 3) != (cpl & 3)) | |
8a3fe4f8 | 1733 | error (_("Invalid LDT entry 0x%03lx."), (unsigned long)ldt_entry); |
10ba702d EZ |
1734 | } |
1735 | } | |
1736 | ||
1737 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1738 | __asm__ __volatile__ ("sldt %0" : "=m" (ldtr) : /* no inputs */ ); | |
1739 | ldt_idx = ldtr / 8; | |
1740 | if (ldt_idx == 0) | |
1741 | puts_filtered ("There is no LDT.\n"); | |
1742 | /* LDT's entry in the GDT must have the type LDT, which is 2. */ | |
1743 | else if (get_descriptor (gdtr.base, ldt_idx, &ldt_descr) != 2) | |
1744 | printf_filtered ("LDT is present (at %#x), but unreadable by GDB.\n", | |
1745 | ldt_descr.base0 | |
1746 | | (ldt_descr.base1 << 16) | |
1747 | | (ldt_descr.base2 << 24)); | |
1748 | else | |
1749 | { | |
1750 | unsigned base = | |
1751 | ldt_descr.base0 | |
1752 | | (ldt_descr.base1 << 16) | |
1753 | | (ldt_descr.base2 << 24); | |
1754 | unsigned limit = ldt_descr.limit0 | (ldt_descr.limit1 << 16); | |
1755 | int max_entry; | |
1756 | ||
1757 | if (ldt_descr.page_granular) | |
1758 | /* Page-granular segments must have the low 12 bits of their | |
1759 | limit set. */ | |
1760 | limit = (limit << 12) | 0xfff; | |
1761 | /* LDT cannot have more than 8K 8-byte entries, i.e. more than | |
1762 | 64KB. */ | |
1763 | if (limit > 0xffff) | |
1764 | limit = 0xffff; | |
1765 | ||
1766 | max_entry = (limit + 1) / 8; | |
1767 | ||
1768 | if (ldt_entry >= 0) | |
1769 | { | |
1770 | if (ldt_entry > limit) | |
8a3fe4f8 | 1771 | error (_("Invalid LDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1772 | (unsigned long)ldt_entry, limit); |
10ba702d EZ |
1773 | |
1774 | display_descriptor (ldt_descr.stype, base, ldt_entry / 8, 1); | |
1775 | } | |
1776 | else | |
1777 | { | |
1778 | int i; | |
1779 | ||
1780 | for (i = 0; i < max_entry; i++) | |
1781 | display_descriptor (ldt_descr.stype, base, i, 0); | |
1782 | } | |
1783 | } | |
1784 | } | |
1785 | ||
1786 | static void | |
1787 | go32_sgdt (char *arg, int from_tty) | |
1788 | { | |
1789 | struct dtr_reg gdtr; | |
1790 | long gdt_entry = -1L; | |
1791 | int max_entry; | |
1792 | ||
1793 | if (arg && *arg) | |
1794 | { | |
529480d0 | 1795 | arg = skip_spaces (arg); |
10ba702d EZ |
1796 | |
1797 | if (*arg) | |
1798 | { | |
1799 | gdt_entry = parse_and_eval_long (arg); | |
1800 | if (gdt_entry < 0 || (gdt_entry & 7) != 0) | |
0963b4bd MS |
1801 | error (_("Invalid GDT entry 0x%03lx: " |
1802 | "not an integral multiple of 8."), | |
ccbc3e6f | 1803 | (unsigned long)gdt_entry); |
10ba702d EZ |
1804 | } |
1805 | } | |
1806 | ||
1807 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1808 | max_entry = (gdtr.limit + 1) / 8; | |
1809 | ||
1810 | if (gdt_entry >= 0) | |
1811 | { | |
1812 | if (gdt_entry > gdtr.limit) | |
8a3fe4f8 | 1813 | error (_("Invalid GDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1814 | (unsigned long)gdt_entry, gdtr.limit); |
10ba702d EZ |
1815 | |
1816 | display_descriptor (0, gdtr.base, gdt_entry / 8, 1); | |
1817 | } | |
1818 | else | |
1819 | { | |
1820 | int i; | |
1821 | ||
1822 | for (i = 0; i < max_entry; i++) | |
1823 | display_descriptor (0, gdtr.base, i, 0); | |
1824 | } | |
1825 | } | |
1826 | ||
1827 | static void | |
1828 | go32_sidt (char *arg, int from_tty) | |
1829 | { | |
1830 | struct dtr_reg idtr; | |
1831 | long idt_entry = -1L; | |
1832 | int max_entry; | |
1833 | ||
1834 | if (arg && *arg) | |
1835 | { | |
529480d0 | 1836 | arg = skip_spaces (arg); |
10ba702d EZ |
1837 | |
1838 | if (*arg) | |
1839 | { | |
1840 | idt_entry = parse_and_eval_long (arg); | |
1841 | if (idt_entry < 0) | |
8a3fe4f8 | 1842 | error (_("Invalid (negative) IDT entry %ld."), idt_entry); |
10ba702d EZ |
1843 | } |
1844 | } | |
1845 | ||
1846 | __asm__ __volatile__ ("sidt %0" : "=m" (idtr) : /* no inputs */ ); | |
1847 | max_entry = (idtr.limit + 1) / 8; | |
0963b4bd | 1848 | if (max_entry > 0x100) /* No more than 256 entries. */ |
10ba702d EZ |
1849 | max_entry = 0x100; |
1850 | ||
1851 | if (idt_entry >= 0) | |
1852 | { | |
1853 | if (idt_entry > idtr.limit) | |
8a3fe4f8 | 1854 | error (_("Invalid IDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1855 | (unsigned long)idt_entry, idtr.limit); |
10ba702d EZ |
1856 | |
1857 | display_descriptor (1, idtr.base, idt_entry, 1); | |
1858 | } | |
1859 | else | |
1860 | { | |
1861 | int i; | |
1862 | ||
1863 | for (i = 0; i < max_entry; i++) | |
1864 | display_descriptor (1, idtr.base, i, 0); | |
1865 | } | |
1866 | } | |
1867 | ||
9f20bf26 EZ |
1868 | /* Cached linear address of the base of the page directory. For |
1869 | now, available only under CWSDPMI. Code based on ideas and | |
1870 | suggestions from Charles Sandmann <sandmann@clio.rice.edu>. */ | |
1871 | static unsigned long pdbr; | |
1872 | ||
1873 | static unsigned long | |
1874 | get_cr3 (void) | |
1875 | { | |
1876 | unsigned offset; | |
1877 | unsigned taskreg; | |
1878 | unsigned long taskbase, cr3; | |
1879 | struct dtr_reg gdtr; | |
1880 | ||
1881 | if (pdbr > 0 && pdbr <= 0xfffff) | |
1882 | return pdbr; | |
1883 | ||
1884 | /* Get the linear address of GDT and the Task Register. */ | |
1885 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1886 | __asm__ __volatile__ ("str %0" : "=m" (taskreg) : /* no inputs */ ); | |
1887 | ||
1888 | /* Task Register is a segment selector for the TSS of the current | |
1889 | task. Therefore, it can be used as an index into the GDT to get | |
1890 | at the segment descriptor for the TSS. To get the index, reset | |
1891 | the low 3 bits of the selector (which give the CPL). Add 2 to the | |
1892 | offset to point to the 3 low bytes of the base address. */ | |
1893 | offset = gdtr.base + (taskreg & 0xfff8) + 2; | |
1894 | ||
1895 | ||
1896 | /* CWSDPMI's task base is always under the 1MB mark. */ | |
1897 | if (offset > 0xfffff) | |
1898 | return 0; | |
1899 | ||
1900 | _farsetsel (_dos_ds); | |
1901 | taskbase = _farnspeekl (offset) & 0xffffffU; | |
1902 | taskbase += _farnspeekl (offset + 2) & 0xff000000U; | |
1903 | if (taskbase > 0xfffff) | |
1904 | return 0; | |
1905 | ||
1906 | /* CR3 (a.k.a. PDBR, the Page Directory Base Register) is stored at | |
1907 | offset 1Ch in the TSS. */ | |
1908 | cr3 = _farnspeekl (taskbase + 0x1c) & ~0xfff; | |
1909 | if (cr3 > 0xfffff) | |
1910 | { | |
0963b4bd | 1911 | #if 0 /* Not fullly supported yet. */ |
9f20bf26 EZ |
1912 | /* The Page Directory is in UMBs. In that case, CWSDPMI puts |
1913 | the first Page Table right below the Page Directory. Thus, | |
1914 | the first Page Table's entry for its own address and the Page | |
1915 | Directory entry for that Page Table will hold the same | |
1916 | physical address. The loop below searches the entire UMB | |
1917 | range of addresses for such an occurence. */ | |
1918 | unsigned long addr, pte_idx; | |
1919 | ||
1920 | for (addr = 0xb0000, pte_idx = 0xb0; | |
1921 | pte_idx < 0xff; | |
1922 | addr += 0x1000, pte_idx++) | |
1923 | { | |
1924 | if (((_farnspeekl (addr + 4 * pte_idx) & 0xfffff027) == | |
1925 | (_farnspeekl (addr + 0x1000) & 0xfffff027)) | |
1926 | && ((_farnspeekl (addr + 4 * pte_idx + 4) & 0xfffff000) == cr3)) | |
1927 | { | |
1928 | cr3 = addr + 0x1000; | |
1929 | break; | |
1930 | } | |
1931 | } | |
a3b9cbb3 | 1932 | #endif |
9f20bf26 EZ |
1933 | |
1934 | if (cr3 > 0xfffff) | |
1935 | cr3 = 0; | |
1936 | } | |
1937 | ||
1938 | return cr3; | |
1939 | } | |
1940 | ||
1941 | /* Return the N'th Page Directory entry. */ | |
1942 | static unsigned long | |
1943 | get_pde (int n) | |
1944 | { | |
1945 | unsigned long pde = 0; | |
1946 | ||
1947 | if (pdbr && n >= 0 && n < 1024) | |
1948 | { | |
1949 | pde = _farpeekl (_dos_ds, pdbr + 4*n); | |
1950 | } | |
1951 | return pde; | |
1952 | } | |
1953 | ||
1954 | /* Return the N'th entry of the Page Table whose Page Directory entry | |
1955 | is PDE. */ | |
1956 | static unsigned long | |
1957 | get_pte (unsigned long pde, int n) | |
1958 | { | |
1959 | unsigned long pte = 0; | |
1960 | ||
1961 | /* pde & 0x80 tests the 4MB page bit. We don't support 4MB | |
1962 | page tables, for now. */ | |
1963 | if ((pde & 1) && !(pde & 0x80) && n >= 0 && n < 1024) | |
1964 | { | |
0963b4bd | 1965 | pde &= ~0xfff; /* Clear non-address bits. */ |
9f20bf26 EZ |
1966 | pte = _farpeekl (_dos_ds, pde + 4*n); |
1967 | } | |
1968 | return pte; | |
1969 | } | |
1970 | ||
1971 | /* Display a Page Directory or Page Table entry. IS_DIR, if non-zero, | |
1972 | says this is a Page Directory entry. If FORCE is non-zero, display | |
1973 | the entry even if its Present flag is off. OFF is the offset of the | |
1974 | address from the page's base address. */ | |
1975 | static void | |
1976 | display_ptable_entry (unsigned long entry, int is_dir, int force, unsigned off) | |
1977 | { | |
1978 | if ((entry & 1) != 0) | |
1979 | { | |
1980 | printf_filtered ("Base=0x%05lx000", entry >> 12); | |
1981 | if ((entry & 0x100) && !is_dir) | |
1982 | puts_filtered (" Global"); | |
1983 | if ((entry & 0x40) && !is_dir) | |
1984 | puts_filtered (" Dirty"); | |
1985 | printf_filtered (" %sAcc.", (entry & 0x20) ? "" : "Not-"); | |
1986 | printf_filtered (" %sCached", (entry & 0x10) ? "" : "Not-"); | |
1987 | printf_filtered (" Write-%s", (entry & 8) ? "Thru" : "Back"); | |
1988 | printf_filtered (" %s", (entry & 4) ? "Usr" : "Sup"); | |
1989 | printf_filtered (" Read-%s", (entry & 2) ? "Write" : "Only"); | |
1990 | if (off) | |
1991 | printf_filtered (" +0x%x", off); | |
1992 | puts_filtered ("\n"); | |
1993 | } | |
1994 | else if (force) | |
1995 | printf_filtered ("Page%s not present or not supported; value=0x%lx.\n", | |
1996 | is_dir ? " Table" : "", entry >> 1); | |
1997 | } | |
1998 | ||
1999 | static void | |
2000 | go32_pde (char *arg, int from_tty) | |
2001 | { | |
2002 | long pde_idx = -1, i; | |
2003 | ||
2004 | if (arg && *arg) | |
2005 | { | |
529480d0 | 2006 | arg = skip_spaces (arg); |
9f20bf26 EZ |
2007 | |
2008 | if (*arg) | |
2009 | { | |
2010 | pde_idx = parse_and_eval_long (arg); | |
2011 | if (pde_idx < 0 || pde_idx >= 1024) | |
8a3fe4f8 | 2012 | error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx); |
9f20bf26 EZ |
2013 | } |
2014 | } | |
2015 | ||
2016 | pdbr = get_cr3 (); | |
2017 | if (!pdbr) | |
0963b4bd MS |
2018 | puts_filtered ("Access to Page Directories is " |
2019 | "not supported on this system.\n"); | |
9f20bf26 EZ |
2020 | else if (pde_idx >= 0) |
2021 | display_ptable_entry (get_pde (pde_idx), 1, 1, 0); | |
2022 | else | |
2023 | for (i = 0; i < 1024; i++) | |
2024 | display_ptable_entry (get_pde (i), 1, 0, 0); | |
2025 | } | |
2026 | ||
2027 | /* A helper function to display entries in a Page Table pointed to by | |
2028 | the N'th entry in the Page Directory. If FORCE is non-zero, say | |
2029 | something even if the Page Table is not accessible. */ | |
2030 | static void | |
2031 | display_page_table (long n, int force) | |
2032 | { | |
2033 | unsigned long pde = get_pde (n); | |
2034 | ||
2035 | if ((pde & 1) != 0) | |
2036 | { | |
2037 | int i; | |
2038 | ||
0963b4bd MS |
2039 | printf_filtered ("Page Table pointed to by " |
2040 | "Page Directory entry 0x%lx:\n", n); | |
9f20bf26 EZ |
2041 | for (i = 0; i < 1024; i++) |
2042 | display_ptable_entry (get_pte (pde, i), 0, 0, 0); | |
2043 | puts_filtered ("\n"); | |
2044 | } | |
2045 | else if (force) | |
2046 | printf_filtered ("Page Table not present; value=0x%lx.\n", pde >> 1); | |
2047 | } | |
2048 | ||
2049 | static void | |
2050 | go32_pte (char *arg, int from_tty) | |
2051 | { | |
ccbc3e6f | 2052 | long pde_idx = -1L, i; |
9f20bf26 EZ |
2053 | |
2054 | if (arg && *arg) | |
2055 | { | |
529480d0 | 2056 | arg = skip_spaces (arg); |
9f20bf26 EZ |
2057 | |
2058 | if (*arg) | |
2059 | { | |
2060 | pde_idx = parse_and_eval_long (arg); | |
2061 | if (pde_idx < 0 || pde_idx >= 1024) | |
8a3fe4f8 | 2062 | error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx); |
9f20bf26 EZ |
2063 | } |
2064 | } | |
2065 | ||
2066 | pdbr = get_cr3 (); | |
2067 | if (!pdbr) | |
2068 | puts_filtered ("Access to Page Tables is not supported on this system.\n"); | |
2069 | else if (pde_idx >= 0) | |
2070 | display_page_table (pde_idx, 1); | |
2071 | else | |
2072 | for (i = 0; i < 1024; i++) | |
2073 | display_page_table (i, 0); | |
2074 | } | |
2075 | ||
2076 | static void | |
2077 | go32_pte_for_address (char *arg, int from_tty) | |
2078 | { | |
2079 | CORE_ADDR addr = 0, i; | |
2080 | ||
2081 | if (arg && *arg) | |
2082 | { | |
529480d0 | 2083 | arg = skip_spaces (arg); |
9f20bf26 EZ |
2084 | |
2085 | if (*arg) | |
2086 | addr = parse_and_eval_address (arg); | |
2087 | } | |
2088 | if (!addr) | |
e2e0b3e5 | 2089 | error_no_arg (_("linear address")); |
9f20bf26 EZ |
2090 | |
2091 | pdbr = get_cr3 (); | |
2092 | if (!pdbr) | |
2093 | puts_filtered ("Access to Page Tables is not supported on this system.\n"); | |
2094 | else | |
2095 | { | |
2096 | int pde_idx = (addr >> 22) & 0x3ff; | |
2097 | int pte_idx = (addr >> 12) & 0x3ff; | |
2098 | unsigned offs = addr & 0xfff; | |
2099 | ||
2244ba2e PM |
2100 | printf_filtered ("Page Table entry for address %s:\n", |
2101 | hex_string(addr)); | |
9f20bf26 EZ |
2102 | display_ptable_entry (get_pte (get_pde (pde_idx), pte_idx), 0, 1, offs); |
2103 | } | |
2104 | } | |
2105 | ||
d8c852a1 EZ |
2106 | static struct cmd_list_element *info_dos_cmdlist = NULL; |
2107 | ||
2108 | static void | |
2109 | go32_info_dos_command (char *args, int from_tty) | |
2110 | { | |
2111 | help_list (info_dos_cmdlist, "info dos ", class_info, gdb_stdout); | |
2112 | } | |
2113 | ||
70976b65 YQ |
2114 | /* -Wmissing-prototypes */ |
2115 | extern initialize_file_ftype _initialize_go32_nat; | |
2116 | ||
e49d4fa6 SS |
2117 | void |
2118 | _initialize_go32_nat (void) | |
2119 | { | |
2120 | init_go32_ops (); | |
2121 | add_target (&go32_ops); | |
10ba702d | 2122 | |
1bedd215 AC |
2123 | add_prefix_cmd ("dos", class_info, go32_info_dos_command, _("\ |
2124 | Print information specific to DJGPP (aka MS-DOS) debugging."), | |
d8c852a1 EZ |
2125 | &info_dos_cmdlist, "info dos ", 0, &infolist); |
2126 | ||
1a966eab AC |
2127 | add_cmd ("sysinfo", class_info, go32_sysinfo, _("\ |
2128 | Display information about the target system, including CPU, OS, DPMI, etc."), | |
d8c852a1 | 2129 | &info_dos_cmdlist); |
1a966eab AC |
2130 | add_cmd ("ldt", class_info, go32_sldt, _("\ |
2131 | Display entries in the LDT (Local Descriptor Table).\n\ | |
2132 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2133 | &info_dos_cmdlist); |
1a966eab AC |
2134 | add_cmd ("gdt", class_info, go32_sgdt, _("\ |
2135 | Display entries in the GDT (Global Descriptor Table).\n\ | |
2136 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2137 | &info_dos_cmdlist); |
1a966eab AC |
2138 | add_cmd ("idt", class_info, go32_sidt, _("\ |
2139 | Display entries in the IDT (Interrupt Descriptor Table).\n\ | |
2140 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2141 | &info_dos_cmdlist); |
1a966eab AC |
2142 | add_cmd ("pde", class_info, go32_pde, _("\ |
2143 | Display entries in the Page Directory.\n\ | |
2144 | Entry number (an expression) as an argument means display only that entry."), | |
9f20bf26 | 2145 | &info_dos_cmdlist); |
1a966eab AC |
2146 | add_cmd ("pte", class_info, go32_pte, _("\ |
2147 | Display entries in Page Tables.\n\ | |
2148 | Entry number (an expression) as an argument means display only entries\n\ | |
2149 | from the Page Table pointed to by the specified Page Directory entry."), | |
9f20bf26 | 2150 | &info_dos_cmdlist); |
1a966eab AC |
2151 | add_cmd ("address-pte", class_info, go32_pte_for_address, _("\ |
2152 | Display a Page Table entry for a linear address.\n\ | |
2153 | The address argument must be a linear address, after adding to\n\ | |
2154 | it the base address of the appropriate segment.\n\ | |
2155 | The base address of variables and functions in the debuggee's data\n\ | |
2156 | or code segment is stored in the variable __djgpp_base_address,\n\ | |
2157 | so use `__djgpp_base_address + (char *)&var' as the argument.\n\ | |
2158 | For other segments, look up their base address in the output of\n\ | |
2159 | the `info dos ldt' command."), | |
9f20bf26 | 2160 | &info_dos_cmdlist); |
e49d4fa6 | 2161 | } |
53a5351d JM |
2162 | |
2163 | pid_t | |
2164 | tcgetpgrp (int fd) | |
2165 | { | |
2166 | if (isatty (fd)) | |
2167 | return SOME_PID; | |
2168 | errno = ENOTTY; | |
2169 | return -1; | |
2170 | } | |
2171 | ||
2172 | int | |
2173 | tcsetpgrp (int fd, pid_t pgid) | |
2174 | { | |
2175 | if (isatty (fd) && pgid == SOME_PID) | |
2176 | return 0; | |
2177 | errno = pgid == SOME_PID ? ENOTTY : ENOSYS; | |
2178 | return -1; | |
2179 | } |