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e49d4fa6 | 1 | /* Native debugging support for Intel x86 running DJGPP. |
ecd75fc8 | 2 | Copyright (C) 1997-2014 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" |
0e9f083f | 102 | #include <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; |
136d6dae | 237 | static void go32_mourn_inferior (struct target_ops *ops); |
b83266a0 SS |
238 | |
239 | static struct target_ops go32_ops; | |
e49d4fa6 | 240 | |
53a5351d | 241 | #define r_ofs(x) (offsetof(TSS,x)) |
e49d4fa6 SS |
242 | |
243 | static struct | |
244 | { | |
53a5351d JM |
245 | size_t tss_ofs; |
246 | size_t size; | |
e49d4fa6 SS |
247 | } |
248 | regno_mapping[] = | |
249 | { | |
0fff5247 EZ |
250 | {r_ofs (tss_eax), 4}, /* normal registers, from a_tss */ |
251 | {r_ofs (tss_ecx), 4}, | |
252 | {r_ofs (tss_edx), 4}, | |
253 | {r_ofs (tss_ebx), 4}, | |
254 | {r_ofs (tss_esp), 4}, | |
255 | {r_ofs (tss_ebp), 4}, | |
256 | {r_ofs (tss_esi), 4}, | |
257 | {r_ofs (tss_edi), 4}, | |
258 | {r_ofs (tss_eip), 4}, | |
259 | {r_ofs (tss_eflags), 4}, | |
260 | {r_ofs (tss_cs), 2}, | |
261 | {r_ofs (tss_ss), 2}, | |
262 | {r_ofs (tss_ds), 2}, | |
263 | {r_ofs (tss_es), 2}, | |
264 | {r_ofs (tss_fs), 2}, | |
265 | {r_ofs (tss_gs), 2}, | |
266 | {0, 10}, /* 8 FP registers, from npx.reg[] */ | |
267 | {1, 10}, | |
268 | {2, 10}, | |
269 | {3, 10}, | |
270 | {4, 10}, | |
271 | {5, 10}, | |
272 | {6, 10}, | |
273 | {7, 10}, | |
53a5351d | 274 | /* The order of the next 7 registers must be consistent |
0fff5247 EZ |
275 | with their numbering in config/i386/tm-i386.h, which see. */ |
276 | {0, 2}, /* control word, from npx */ | |
277 | {4, 2}, /* status word, from npx */ | |
278 | {8, 2}, /* tag word, from npx */ | |
279 | {16, 2}, /* last FP exception CS from npx */ | |
280 | {12, 4}, /* last FP exception EIP from npx */ | |
281 | {24, 2}, /* last FP exception operand selector from npx */ | |
282 | {20, 4}, /* last FP exception operand offset from npx */ | |
283 | {18, 2} /* last FP opcode from npx */ | |
e49d4fa6 SS |
284 | }; |
285 | ||
286 | static struct | |
287 | { | |
288 | int go32_sig; | |
2ea28649 | 289 | enum gdb_signal gdb_sig; |
e49d4fa6 SS |
290 | } |
291 | sig_map[] = | |
292 | { | |
a493e3e2 PA |
293 | {0, GDB_SIGNAL_FPE}, |
294 | {1, GDB_SIGNAL_TRAP}, | |
53a5351d JM |
295 | /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL, |
296 | but I think SIGBUS is better, since the NMI is usually activated | |
297 | as a result of a memory parity check failure. */ | |
a493e3e2 PA |
298 | {2, GDB_SIGNAL_BUS}, |
299 | {3, GDB_SIGNAL_TRAP}, | |
300 | {4, GDB_SIGNAL_FPE}, | |
301 | {5, GDB_SIGNAL_SEGV}, | |
302 | {6, GDB_SIGNAL_ILL}, | |
303 | {7, GDB_SIGNAL_EMT}, /* no-coprocessor exception */ | |
304 | {8, GDB_SIGNAL_SEGV}, | |
305 | {9, GDB_SIGNAL_SEGV}, | |
306 | {10, GDB_SIGNAL_BUS}, | |
307 | {11, GDB_SIGNAL_SEGV}, | |
308 | {12, GDB_SIGNAL_SEGV}, | |
309 | {13, GDB_SIGNAL_SEGV}, | |
310 | {14, GDB_SIGNAL_SEGV}, | |
311 | {16, GDB_SIGNAL_FPE}, | |
312 | {17, GDB_SIGNAL_BUS}, | |
313 | {31, GDB_SIGNAL_ILL}, | |
314 | {0x1b, GDB_SIGNAL_INT}, | |
315 | {0x75, GDB_SIGNAL_FPE}, | |
316 | {0x78, GDB_SIGNAL_ALRM}, | |
317 | {0x79, GDB_SIGNAL_INT}, | |
318 | {0x7a, GDB_SIGNAL_QUIT}, | |
319 | {-1, GDB_SIGNAL_LAST} | |
e49d4fa6 SS |
320 | }; |
321 | ||
53a5351d | 322 | static struct { |
2ea28649 | 323 | enum gdb_signal gdb_sig; |
53a5351d JM |
324 | int djgpp_excepno; |
325 | } excepn_map[] = { | |
a493e3e2 PA |
326 | {GDB_SIGNAL_0, -1}, |
327 | {GDB_SIGNAL_ILL, 6}, /* Invalid Opcode */ | |
328 | {GDB_SIGNAL_EMT, 7}, /* triggers SIGNOFP */ | |
329 | {GDB_SIGNAL_SEGV, 13}, /* GPF */ | |
330 | {GDB_SIGNAL_BUS, 17}, /* Alignment Check */ | |
53a5351d JM |
331 | /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for |
332 | details. */ | |
a493e3e2 PA |
333 | {GDB_SIGNAL_TERM, 0x1b}, /* triggers Ctrl-Break type of SIGINT */ |
334 | {GDB_SIGNAL_FPE, 0x75}, | |
335 | {GDB_SIGNAL_INT, 0x79}, | |
336 | {GDB_SIGNAL_QUIT, 0x7a}, | |
337 | {GDB_SIGNAL_ALRM, 0x78}, /* triggers SIGTIMR */ | |
338 | {GDB_SIGNAL_PROF, 0x78}, | |
339 | {GDB_SIGNAL_LAST, -1} | |
53a5351d JM |
340 | }; |
341 | ||
e49d4fa6 | 342 | static void |
4d277981 | 343 | go32_open (char *name, int from_tty) |
e49d4fa6 | 344 | { |
53a5351d | 345 | printf_unfiltered ("Done. Use the \"run\" command to run the program.\n"); |
e49d4fa6 SS |
346 | } |
347 | ||
348 | static void | |
de90e03d | 349 | go32_close (struct target_ops *self) |
e49d4fa6 SS |
350 | { |
351 | } | |
352 | ||
353 | static void | |
136d6dae | 354 | go32_attach (struct target_ops *ops, char *args, int from_tty) |
e49d4fa6 | 355 | { |
8a3fe4f8 | 356 | error (_("\ |
53a5351d | 357 | You cannot attach to a running program on this platform.\n\ |
8a3fe4f8 | 358 | Use the `run' command to run DJGPP programs.")); |
e49d4fa6 SS |
359 | } |
360 | ||
361 | static void | |
52554a0e | 362 | go32_detach (struct target_ops *ops, const char *args, int from_tty) |
e49d4fa6 SS |
363 | { |
364 | } | |
365 | ||
366 | static int resume_is_step; | |
53a5351d | 367 | static int resume_signal = -1; |
e49d4fa6 SS |
368 | |
369 | static void | |
28439f5e | 370 | go32_resume (struct target_ops *ops, |
2ea28649 | 371 | ptid_t ptid, int step, enum gdb_signal siggnal) |
c5aa993b | 372 | { |
53a5351d JM |
373 | int i; |
374 | ||
c5aa993b | 375 | resume_is_step = step; |
53a5351d | 376 | |
a493e3e2 | 377 | if (siggnal != GDB_SIGNAL_0 && siggnal != GDB_SIGNAL_TRAP) |
53a5351d | 378 | { |
0fff5247 | 379 | for (i = 0, resume_signal = -1; |
a493e3e2 | 380 | excepn_map[i].gdb_sig != GDB_SIGNAL_LAST; i++) |
53a5351d JM |
381 | if (excepn_map[i].gdb_sig == siggnal) |
382 | { | |
383 | resume_signal = excepn_map[i].djgpp_excepno; | |
384 | break; | |
385 | } | |
386 | if (resume_signal == -1) | |
387 | printf_unfiltered ("Cannot deliver signal %s on this platform.\n", | |
2ea28649 | 388 | gdb_signal_to_name (siggnal)); |
53a5351d | 389 | } |
c5aa993b | 390 | } |
e49d4fa6 | 391 | |
53a5351d JM |
392 | static char child_cwd[FILENAME_MAX]; |
393 | ||
31616044 | 394 | static ptid_t |
117de6a9 | 395 | go32_wait (struct target_ops *ops, |
47608cb1 | 396 | ptid_t ptid, struct target_waitstatus *status, int options) |
e49d4fa6 SS |
397 | { |
398 | int i; | |
53a5351d | 399 | unsigned char saved_opcode; |
0fff5247 | 400 | unsigned long INT3_addr = 0; |
53a5351d | 401 | int stepping_over_INT = 0; |
e49d4fa6 | 402 | |
0963b4bd | 403 | a_tss.tss_eflags &= 0xfeff; /* Reset the single-step flag (TF). */ |
e49d4fa6 | 404 | if (resume_is_step) |
53a5351d JM |
405 | { |
406 | /* If the next instruction is INT xx or INTO, we need to handle | |
407 | them specially. Intel manuals say that these instructions | |
408 | reset the single-step flag (a.k.a. TF). However, it seems | |
409 | that, at least in the DPMI environment, and at least when | |
410 | stepping over the DPMI interrupt 31h, the problem is having | |
411 | TF set at all when INT 31h is executed: the debuggee either | |
412 | crashes (and takes the system with it) or is killed by a | |
413 | SIGTRAP. | |
414 | ||
415 | So we need to emulate single-step mode: we put an INT3 opcode | |
416 | right after the INT xx instruction, let the debuggee run | |
417 | until it hits INT3 and stops, then restore the original | |
418 | instruction which we overwrote with the INT3 opcode, and back | |
419 | up the debuggee's EIP to that instruction. */ | |
420 | read_child (a_tss.tss_eip, &saved_opcode, 1); | |
421 | if (saved_opcode == 0xCD || saved_opcode == 0xCE) | |
422 | { | |
423 | unsigned char INT3_opcode = 0xCC; | |
424 | ||
425 | INT3_addr | |
426 | = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1; | |
427 | stepping_over_INT = 1; | |
428 | read_child (INT3_addr, &saved_opcode, 1); | |
429 | write_child (INT3_addr, &INT3_opcode, 1); | |
430 | } | |
431 | else | |
432 | a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */ | |
433 | } | |
434 | ||
435 | /* The special value FFFFh in tss_trap indicates to run_child that | |
436 | tss_irqn holds a signal to be delivered to the debuggee. */ | |
437 | if (resume_signal <= -1) | |
438 | { | |
439 | a_tss.tss_trap = 0; | |
440 | a_tss.tss_irqn = 0xff; | |
441 | } | |
e49d4fa6 | 442 | else |
53a5351d | 443 | { |
0963b4bd | 444 | a_tss.tss_trap = 0xffff; /* run_child looks for this. */ |
53a5351d JM |
445 | a_tss.tss_irqn = resume_signal; |
446 | } | |
447 | ||
448 | /* The child might change working directory behind our back. The | |
449 | GDB users won't like the side effects of that when they work with | |
450 | relative file names, and GDB might be confused by its current | |
451 | directory not being in sync with the truth. So we always make a | |
452 | point of changing back to where GDB thinks is its cwd, when we | |
453 | return control to the debugger, but restore child's cwd before we | |
454 | run it. */ | |
3a45aed8 EZ |
455 | /* Initialize child_cwd, before the first call to run_child and not |
456 | in the initialization, so the child get also the changed directory | |
0963b4bd | 457 | set with the gdb-command "cd ..." */ |
3a45aed8 EZ |
458 | if (!*child_cwd) |
459 | /* Initialize child's cwd with the current one. */ | |
460 | getcwd (child_cwd, sizeof (child_cwd)); | |
4d277981 | 461 | |
53a5351d | 462 | chdir (child_cwd); |
e49d4fa6 | 463 | |
b83266a0 | 464 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 465 | load_npx (); |
b83266a0 | 466 | #endif |
e49d4fa6 | 467 | run_child (); |
b83266a0 | 468 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 469 | save_npx (); |
b83266a0 | 470 | #endif |
e49d4fa6 | 471 | |
53a5351d JM |
472 | /* Did we step over an INT xx instruction? */ |
473 | if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1) | |
474 | { | |
475 | /* Restore the original opcode. */ | |
0963b4bd | 476 | a_tss.tss_eip--; /* EIP points *after* the INT3 instruction. */ |
53a5351d JM |
477 | write_child (a_tss.tss_eip, &saved_opcode, 1); |
478 | /* Simulate a TRAP exception. */ | |
479 | a_tss.tss_irqn = 1; | |
480 | a_tss.tss_eflags |= 0x0100; | |
481 | } | |
482 | ||
483 | getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */ | |
484 | chdir (current_directory); | |
485 | ||
e49d4fa6 SS |
486 | if (a_tss.tss_irqn == 0x21) |
487 | { | |
488 | status->kind = TARGET_WAITKIND_EXITED; | |
489 | status->value.integer = a_tss.tss_eax & 0xff; | |
490 | } | |
491 | else | |
492 | { | |
a493e3e2 | 493 | status->value.sig = GDB_SIGNAL_UNKNOWN; |
e49d4fa6 SS |
494 | status->kind = TARGET_WAITKIND_STOPPED; |
495 | for (i = 0; sig_map[i].go32_sig != -1; i++) | |
496 | { | |
497 | if (a_tss.tss_irqn == sig_map[i].go32_sig) | |
498 | { | |
53a5351d | 499 | #if __DJGPP_MINOR__ < 3 |
e49d4fa6 | 500 | if ((status->value.sig = sig_map[i].gdb_sig) != |
a493e3e2 | 501 | GDB_SIGNAL_TRAP) |
e49d4fa6 | 502 | status->kind = TARGET_WAITKIND_SIGNALLED; |
53a5351d JM |
503 | #else |
504 | status->value.sig = sig_map[i].gdb_sig; | |
505 | #endif | |
e49d4fa6 SS |
506 | break; |
507 | } | |
508 | } | |
509 | } | |
31616044 | 510 | return pid_to_ptid (SOME_PID); |
e49d4fa6 SS |
511 | } |
512 | ||
513 | static void | |
56be3814 | 514 | fetch_register (struct regcache *regcache, int regno) |
e49d4fa6 | 515 | { |
9d0b3624 PA |
516 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
517 | if (regno < gdbarch_fp0_regnum (gdbarch)) | |
56be3814 | 518 | regcache_raw_supply (regcache, regno, |
23a6d369 | 519 | (char *) &a_tss + regno_mapping[regno].tss_ofs); |
0963b4bd MS |
520 | else if (i386_fp_regnum_p (gdbarch, regno) || i386_fpc_regnum_p (gdbarch, |
521 | regno)) | |
56be3814 | 522 | i387_supply_fsave (regcache, regno, &npx); |
89dea5aa EZ |
523 | else |
524 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 525 | _("Invalid register no. %d in fetch_register."), regno); |
89dea5aa | 526 | } |
e49d4fa6 | 527 | |
89dea5aa | 528 | static void |
28439f5e PA |
529 | go32_fetch_registers (struct target_ops *ops, |
530 | struct regcache *regcache, int regno) | |
89dea5aa EZ |
531 | { |
532 | if (regno >= 0) | |
56be3814 | 533 | fetch_register (regcache, regno); |
89dea5aa | 534 | else |
e49d4fa6 | 535 | { |
7067c689 UW |
536 | for (regno = 0; |
537 | regno < gdbarch_fp0_regnum (get_regcache_arch (regcache)); | |
538 | regno++) | |
56be3814 UW |
539 | fetch_register (regcache, regno); |
540 | i387_supply_fsave (regcache, -1, &npx); | |
e49d4fa6 SS |
541 | } |
542 | } | |
543 | ||
544 | static void | |
56be3814 | 545 | store_register (const struct regcache *regcache, int regno) |
e49d4fa6 | 546 | { |
9d0b3624 PA |
547 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
548 | if (regno < gdbarch_fp0_regnum (gdbarch)) | |
56be3814 | 549 | regcache_raw_collect (regcache, regno, |
822c9732 | 550 | (char *) &a_tss + regno_mapping[regno].tss_ofs); |
0963b4bd MS |
551 | else if (i386_fp_regnum_p (gdbarch, regno) || i386_fpc_regnum_p (gdbarch, |
552 | regno)) | |
56be3814 | 553 | i387_collect_fsave (regcache, regno, &npx); |
e49d4fa6 | 554 | else |
8e65ff28 | 555 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 556 | _("Invalid register no. %d in store_register."), regno); |
e49d4fa6 SS |
557 | } |
558 | ||
559 | static void | |
28439f5e PA |
560 | go32_store_registers (struct target_ops *ops, |
561 | struct regcache *regcache, int regno) | |
e49d4fa6 | 562 | { |
0fff5247 | 563 | unsigned r; |
e49d4fa6 SS |
564 | |
565 | if (regno >= 0) | |
56be3814 | 566 | store_register (regcache, regno); |
e49d4fa6 SS |
567 | else |
568 | { | |
7067c689 | 569 | for (r = 0; r < gdbarch_fp0_regnum (get_regcache_arch (regcache)); r++) |
56be3814 UW |
570 | store_register (regcache, r); |
571 | i387_collect_fsave (regcache, -1, &npx); | |
e49d4fa6 SS |
572 | } |
573 | } | |
574 | ||
575 | static void | |
f32dbf8c | 576 | go32_prepare_to_store (struct target_ops *self, struct regcache *regcache) |
e49d4fa6 SS |
577 | { |
578 | } | |
579 | ||
bd265cd0 PA |
580 | |
581 | /* Const-correct version of DJGPP's write_child, which unfortunately | |
582 | takes a non-const buffer pointer. */ | |
583 | ||
e49d4fa6 | 584 | static int |
bd265cd0 | 585 | my_write_child (unsigned child_addr, const void *buf, unsigned len) |
e49d4fa6 | 586 | { |
bd265cd0 PA |
587 | static void *buffer = NULL; |
588 | static unsigned buffer_len = 0; | |
589 | int res; | |
590 | ||
591 | if (buffer_len < len) | |
e49d4fa6 | 592 | { |
bd265cd0 PA |
593 | buffer = xrealloc (buffer, len); |
594 | buffer_len = len; | |
e49d4fa6 | 595 | } |
bd265cd0 PA |
596 | |
597 | memcpy (buffer, buf, len); | |
598 | res = write_child (child_addr, buffer, len); | |
599 | return res; | |
600 | } | |
601 | ||
602 | /* Helper for go32_xfer_partial that handles memory transfers. | |
603 | Arguments are like target_xfer_partial. */ | |
604 | ||
605 | static enum target_xfer_status | |
606 | go32_xfer_memory (gdb_byte *readbuf, const gdb_byte *writebuf, | |
607 | ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len) | |
608 | { | |
609 | int res; | |
610 | ||
611 | if (writebuf != NULL) | |
612 | res = my_write_child (memaddr, writebuf, len); | |
e49d4fa6 | 613 | else |
bd265cd0 PA |
614 | res = read_child (memaddr, readbuf, len); |
615 | ||
616 | if (res <= 0) | |
617 | return TARGET_XFER_E_IO; | |
618 | ||
619 | *xfered_len = res; | |
620 | return TARGET_XFER_OK; | |
621 | } | |
622 | ||
623 | /* Target to_xfer_partial implementation. */ | |
624 | ||
625 | static enum target_xfer_status | |
626 | go32_xfer_partial (struct target_ops *ops, enum target_object object, | |
627 | const char *annex, gdb_byte *readbuf, | |
628 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, | |
629 | ULONGEST *xfered_len) | |
630 | { | |
631 | switch (object) | |
e49d4fa6 | 632 | { |
bd265cd0 PA |
633 | case TARGET_OBJECT_MEMORY: |
634 | return go32_xfer_memory (readbuf, writebuf, offset, len, xfered_len); | |
635 | ||
636 | default: | |
637 | return ops->beneath->to_xfer_partial (ops->beneath, object, annex, | |
638 | readbuf, writebuf, offset, len, | |
639 | xfered_len); | |
e49d4fa6 SS |
640 | } |
641 | } | |
642 | ||
0963b4bd | 643 | static cmdline_t child_cmd; /* Parsed child's command line kept here. */ |
53a5351d | 644 | |
e49d4fa6 | 645 | static void |
4d277981 | 646 | go32_files_info (struct target_ops *target) |
e49d4fa6 | 647 | { |
53a5351d | 648 | printf_unfiltered ("You are running a DJGPP V2 program.\n"); |
e49d4fa6 SS |
649 | } |
650 | ||
e49d4fa6 | 651 | static void |
7d85a9c0 | 652 | go32_kill_inferior (struct target_ops *ops) |
e49d4fa6 | 653 | { |
67ce33d7 | 654 | go32_mourn_inferior (ops); |
e49d4fa6 SS |
655 | } |
656 | ||
657 | static void | |
267fbcde JB |
658 | go32_create_inferior (struct target_ops *ops, char *exec_file, |
659 | char *args, char **env, int from_tty) | |
e49d4fa6 | 660 | { |
4d277981 | 661 | extern char **environ; |
e49d4fa6 SS |
662 | jmp_buf start_state; |
663 | char *cmdline; | |
664 | char **env_save = environ; | |
150985e3 | 665 | size_t cmdlen; |
6c95b8df | 666 | struct inferior *inf; |
e49d4fa6 | 667 | |
0fff5247 EZ |
668 | /* If no exec file handed to us, get it from the exec-file command -- with |
669 | a good, common error message if none is specified. */ | |
670 | if (exec_file == 0) | |
671 | exec_file = get_exec_file (1); | |
672 | ||
53a5351d JM |
673 | resume_signal = -1; |
674 | resume_is_step = 0; | |
3a45aed8 EZ |
675 | |
676 | /* Initialize child's cwd as empty to be initialized when starting | |
677 | the child. */ | |
678 | *child_cwd = 0; | |
679 | ||
53a5351d JM |
680 | /* Init command line storage. */ |
681 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 | 682 | internal_error (__FILE__, __LINE__, |
0963b4bd MS |
683 | _("Cannot allocate redirection storage: " |
684 | "not enough memory.\n")); | |
53a5351d JM |
685 | |
686 | /* Parse the command line and create redirections. */ | |
687 | if (strpbrk (args, "<>")) | |
688 | { | |
689 | if (redir_cmdline_parse (args, &child_cmd) == 0) | |
690 | args = child_cmd.command; | |
691 | else | |
8a3fe4f8 | 692 | error (_("Syntax error in command line.")); |
53a5351d JM |
693 | } |
694 | else | |
c2d11a7d | 695 | child_cmd.command = xstrdup (args); |
e49d4fa6 | 696 | |
150985e3 EZ |
697 | cmdlen = strlen (args); |
698 | /* v2loadimage passes command lines via DOS memory, so it cannot | |
699 | possibly handle commands longer than 1MB. */ | |
700 | if (cmdlen > 1024*1024) | |
8a3fe4f8 | 701 | error (_("Command line too long.")); |
150985e3 EZ |
702 | |
703 | cmdline = xmalloc (cmdlen + 4); | |
e49d4fa6 | 704 | strcpy (cmdline + 1, args); |
150985e3 EZ |
705 | /* If the command-line length fits into DOS 126-char limits, use the |
706 | DOS command tail format; otherwise, tell v2loadimage to pass it | |
707 | through a buffer in conventional memory. */ | |
708 | if (cmdlen < 127) | |
709 | { | |
710 | cmdline[0] = strlen (args); | |
711 | cmdline[cmdlen + 1] = 13; | |
712 | } | |
713 | else | |
0963b4bd | 714 | cmdline[0] = 0xff; /* Signal v2loadimage it's a long command. */ |
e49d4fa6 SS |
715 | |
716 | environ = env; | |
717 | ||
718 | if (v2loadimage (exec_file, cmdline, start_state)) | |
719 | { | |
720 | environ = env_save; | |
721 | printf_unfiltered ("Load failed for image %s\n", exec_file); | |
722 | exit (1); | |
723 | } | |
724 | environ = env_save; | |
12a498f3 | 725 | xfree (cmdline); |
e49d4fa6 SS |
726 | |
727 | edi_init (start_state); | |
53a5351d JM |
728 | #if __DJGPP_MINOR__ < 3 |
729 | save_npx (); | |
730 | #endif | |
e49d4fa6 | 731 | |
39f77062 | 732 | inferior_ptid = pid_to_ptid (SOME_PID); |
6c95b8df | 733 | inf = current_inferior (); |
20176d8f | 734 | inferior_appeared (inf, SOME_PID); |
7f9f62ba | 735 | |
e49d4fa6 | 736 | push_target (&go32_ops); |
444c3224 PA |
737 | |
738 | add_thread_silent (inferior_ptid); | |
739 | ||
e49d4fa6 SS |
740 | clear_proceed_status (); |
741 | insert_breakpoints (); | |
b83266a0 | 742 | prog_has_started = 1; |
e49d4fa6 SS |
743 | } |
744 | ||
745 | static void | |
136d6dae | 746 | go32_mourn_inferior (struct target_ops *ops) |
e49d4fa6 | 747 | { |
67ce33d7 PA |
748 | ptid_t ptid; |
749 | ||
750 | redir_cmdline_delete (&child_cmd); | |
751 | resume_signal = -1; | |
752 | resume_is_step = 0; | |
753 | ||
754 | cleanup_client (); | |
755 | ||
53a5351d JM |
756 | /* We need to make sure all the breakpoint enable bits in the DR7 |
757 | register are reset when the inferior exits. Otherwise, if they | |
758 | rerun the inferior, the uncleared bits may cause random SIGTRAPs, | |
759 | failure to set more watchpoints, and other calamities. It would | |
760 | be nice if GDB itself would take care to remove all breakpoints | |
761 | at all times, but it doesn't, probably under an assumption that | |
762 | the OS cleans up when the debuggee exits. */ | |
e24d4c64 | 763 | i386_cleanup_dregs (); |
67ce33d7 PA |
764 | |
765 | ptid = inferior_ptid; | |
766 | inferior_ptid = null_ptid; | |
767 | delete_thread_silent (ptid); | |
768 | prog_has_started = 0; | |
769 | ||
770 | unpush_target (ops); | |
e49d4fa6 SS |
771 | generic_mourn_inferior (); |
772 | } | |
773 | ||
774 | static int | |
da82bd6b | 775 | go32_can_run (struct target_ops *self) |
e49d4fa6 SS |
776 | { |
777 | return 1; | |
778 | } | |
779 | ||
e49d4fa6 SS |
780 | /* Hardware watchpoint support. */ |
781 | ||
e49d4fa6 | 782 | #define D_REGS edi.dr |
e24d4c64 EZ |
783 | #define CONTROL D_REGS[7] |
784 | #define STATUS D_REGS[6] | |
53a5351d | 785 | |
e24d4c64 EZ |
786 | /* Pass the address ADDR to the inferior in the I'th debug register. |
787 | Here we just store the address in D_REGS, the watchpoint will be | |
788 | actually set up when go32_wait runs the debuggee. */ | |
9bb9e8ad | 789 | static void |
e24d4c64 | 790 | go32_set_dr (int i, CORE_ADDR addr) |
e49d4fa6 | 791 | { |
4d277981 EZ |
792 | if (i < 0 || i > 3) |
793 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 794 | _("Invalid register %d in go32_set_dr.\n"), i); |
e24d4c64 | 795 | D_REGS[i] = addr; |
e49d4fa6 SS |
796 | } |
797 | ||
e24d4c64 EZ |
798 | /* Pass the value VAL to the inferior in the DR7 debug control |
799 | register. Here we just store the address in D_REGS, the watchpoint | |
800 | will be actually set up when go32_wait runs the debuggee. */ | |
9bb9e8ad PM |
801 | static void |
802 | go32_set_dr7 (unsigned long val) | |
53a5351d | 803 | { |
e24d4c64 | 804 | CONTROL = val; |
53a5351d JM |
805 | } |
806 | ||
e24d4c64 EZ |
807 | /* Get the value of the DR6 debug status register from the inferior. |
808 | Here we just return the value stored in D_REGS, as we've got it | |
809 | from the last go32_wait call. */ | |
9bb9e8ad | 810 | static unsigned long |
e24d4c64 | 811 | go32_get_dr6 (void) |
e49d4fa6 | 812 | { |
e24d4c64 | 813 | return STATUS; |
e49d4fa6 SS |
814 | } |
815 | ||
7b50312a PA |
816 | /* Get the value of the DR7 debug status register from the inferior. |
817 | Here we just return the value stored in D_REGS, as we've got it | |
818 | from the last go32_wait call. */ | |
819 | ||
820 | static unsigned long | |
821 | go32_get_dr7 (void) | |
822 | { | |
823 | return CONTROL; | |
824 | } | |
825 | ||
826 | /* Get the value of the DR debug register I from the inferior. Here | |
827 | we just return the value stored in D_REGS, as we've got it from the | |
828 | last go32_wait call. */ | |
829 | ||
830 | static CORE_ADDR | |
831 | go32_get_dr (int i) | |
832 | { | |
833 | if (i < 0 || i > 3) | |
834 | internal_error (__FILE__, __LINE__, | |
835 | _("Invalid register %d in go32_get_dr.\n"), i); | |
836 | return D_REGS[i]; | |
837 | } | |
838 | ||
53a5351d JM |
839 | /* Put the device open on handle FD into either raw or cooked |
840 | mode, return 1 if it was in raw mode, zero otherwise. */ | |
841 | ||
842 | static int | |
843 | device_mode (int fd, int raw_p) | |
844 | { | |
845 | int oldmode, newmode; | |
846 | __dpmi_regs regs; | |
847 | ||
848 | regs.x.ax = 0x4400; | |
849 | regs.x.bx = fd; | |
850 | __dpmi_int (0x21, ®s); | |
851 | if (regs.x.flags & 1) | |
852 | return -1; | |
853 | newmode = oldmode = regs.x.dx; | |
854 | ||
855 | if (raw_p) | |
856 | newmode |= 0x20; | |
857 | else | |
858 | newmode &= ~0x20; | |
859 | ||
0963b4bd | 860 | if (oldmode & 0x80) /* Only for character dev. */ |
53a5351d JM |
861 | { |
862 | regs.x.ax = 0x4401; | |
863 | regs.x.bx = fd; | |
0963b4bd | 864 | regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails. */ |
53a5351d JM |
865 | __dpmi_int (0x21, ®s); |
866 | if (regs.x.flags & 1) | |
867 | return -1; | |
868 | } | |
869 | return (oldmode & 0x20) == 0x20; | |
870 | } | |
871 | ||
872 | ||
873 | static int inf_mode_valid = 0; | |
874 | static int inf_terminal_mode; | |
875 | ||
876 | /* This semaphore is needed because, amazingly enough, GDB calls | |
877 | target.to_terminal_ours more than once after the inferior stops. | |
878 | But we need the information from the first call only, since the | |
879 | second call will always see GDB's own cooked terminal. */ | |
880 | static int terminal_is_ours = 1; | |
881 | ||
cce74817 | 882 | static void |
c42bf286 | 883 | go32_terminal_init (struct target_ops *self) |
cce74817 | 884 | { |
0963b4bd | 885 | inf_mode_valid = 0; /* Reinitialize, in case they are restarting child. */ |
53a5351d | 886 | terminal_is_ours = 1; |
cce74817 JM |
887 | } |
888 | ||
889 | static void | |
0a4f40a2 | 890 | go32_terminal_info (struct target_ops *self, const char *args, int from_tty) |
cce74817 | 891 | { |
53a5351d JM |
892 | printf_unfiltered ("Inferior's terminal is in %s mode.\n", |
893 | !inf_mode_valid | |
894 | ? "default" : inf_terminal_mode ? "raw" : "cooked"); | |
895 | ||
896 | #if __DJGPP_MINOR__ > 2 | |
897 | if (child_cmd.redirection) | |
898 | { | |
899 | int i; | |
900 | ||
901 | for (i = 0; i < DBG_HANDLES; i++) | |
c5aa993b | 902 | { |
53a5351d JM |
903 | if (child_cmd.redirection[i]->file_name) |
904 | printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n", | |
905 | i, child_cmd.redirection[i]->file_name); | |
906 | else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1) | |
907 | printf_unfiltered | |
908 | ("\tFile handle %d appears to be closed by inferior.\n", i); | |
909 | /* Mask off the raw/cooked bit when comparing device info words. */ | |
910 | else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf) | |
911 | != (_get_dev_info (i) & 0xdf)) | |
912 | printf_unfiltered | |
913 | ("\tFile handle %d appears to be redirected by inferior.\n", i); | |
c5aa993b | 914 | } |
53a5351d JM |
915 | } |
916 | #endif | |
917 | } | |
918 | ||
919 | static void | |
d2f640d4 | 920 | go32_terminal_inferior (struct target_ops *self) |
53a5351d JM |
921 | { |
922 | /* Redirect standard handles as child wants them. */ | |
923 | errno = 0; | |
924 | if (redir_to_child (&child_cmd) == -1) | |
925 | { | |
926 | redir_to_debugger (&child_cmd); | |
8a3fe4f8 | 927 | error (_("Cannot redirect standard handles for program: %s."), |
dc672865 | 928 | safe_strerror (errno)); |
53a5351d | 929 | } |
0963b4bd MS |
930 | /* Set the console device of the inferior to whatever mode |
931 | (raw or cooked) we found it last time. */ | |
53a5351d JM |
932 | if (terminal_is_ours) |
933 | { | |
934 | if (inf_mode_valid) | |
935 | device_mode (0, inf_terminal_mode); | |
936 | terminal_is_ours = 0; | |
937 | } | |
cce74817 JM |
938 | } |
939 | ||
940 | static void | |
e3594fd1 | 941 | go32_terminal_ours (struct target_ops *self) |
cce74817 | 942 | { |
53a5351d | 943 | /* Switch to cooked mode on the gdb terminal and save the inferior |
0963b4bd | 944 | terminal mode to be restored when it is resumed. */ |
53a5351d JM |
945 | if (!terminal_is_ours) |
946 | { | |
947 | inf_terminal_mode = device_mode (0, 0); | |
948 | if (inf_terminal_mode != -1) | |
949 | inf_mode_valid = 1; | |
950 | else | |
951 | /* If device_mode returned -1, we don't know what happens with | |
952 | handle 0 anymore, so make the info invalid. */ | |
953 | inf_mode_valid = 0; | |
954 | terminal_is_ours = 1; | |
955 | ||
956 | /* Restore debugger's standard handles. */ | |
957 | errno = 0; | |
958 | if (redir_to_debugger (&child_cmd) == -1) | |
959 | { | |
960 | redir_to_child (&child_cmd); | |
8a3fe4f8 | 961 | error (_("Cannot redirect standard handles for debugger: %s."), |
dc672865 | 962 | safe_strerror (errno)); |
53a5351d JM |
963 | } |
964 | } | |
cce74817 JM |
965 | } |
966 | ||
444c3224 | 967 | static int |
28439f5e | 968 | go32_thread_alive (struct target_ops *ops, ptid_t ptid) |
444c3224 | 969 | { |
89c9c2ec | 970 | return !ptid_equal (inferior_ptid, null_ptid); |
444c3224 PA |
971 | } |
972 | ||
973 | static char * | |
117de6a9 | 974 | go32_pid_to_str (struct target_ops *ops, ptid_t ptid) |
444c3224 | 975 | { |
89c9c2ec | 976 | return normal_pid_to_str (ptid); |
444c3224 PA |
977 | } |
978 | ||
e49d4fa6 SS |
979 | static void |
980 | init_go32_ops (void) | |
981 | { | |
982 | go32_ops.to_shortname = "djgpp"; | |
983 | go32_ops.to_longname = "djgpp target process"; | |
984 | go32_ops.to_doc = | |
985 | "Program loaded by djgpp, when gdb is used as an external debugger"; | |
986 | go32_ops.to_open = go32_open; | |
987 | go32_ops.to_close = go32_close; | |
53a5351d | 988 | go32_ops.to_attach = go32_attach; |
e49d4fa6 SS |
989 | go32_ops.to_detach = go32_detach; |
990 | go32_ops.to_resume = go32_resume; | |
991 | go32_ops.to_wait = go32_wait; | |
992 | go32_ops.to_fetch_registers = go32_fetch_registers; | |
993 | go32_ops.to_store_registers = go32_store_registers; | |
994 | go32_ops.to_prepare_to_store = go32_prepare_to_store; | |
bd265cd0 | 995 | go32_ops.to_xfer_partial = go32_xfer_partial; |
e49d4fa6 SS |
996 | go32_ops.to_files_info = go32_files_info; |
997 | go32_ops.to_insert_breakpoint = memory_insert_breakpoint; | |
998 | go32_ops.to_remove_breakpoint = memory_remove_breakpoint; | |
cce74817 JM |
999 | go32_ops.to_terminal_init = go32_terminal_init; |
1000 | go32_ops.to_terminal_inferior = go32_terminal_inferior; | |
53a5351d | 1001 | go32_ops.to_terminal_ours_for_output = go32_terminal_ours; |
cce74817 | 1002 | go32_ops.to_terminal_ours = go32_terminal_ours; |
53a5351d | 1003 | go32_ops.to_terminal_info = go32_terminal_info; |
e49d4fa6 SS |
1004 | go32_ops.to_kill = go32_kill_inferior; |
1005 | go32_ops.to_create_inferior = go32_create_inferior; | |
1006 | go32_ops.to_mourn_inferior = go32_mourn_inferior; | |
1007 | go32_ops.to_can_run = go32_can_run; | |
444c3224 PA |
1008 | go32_ops.to_thread_alive = go32_thread_alive; |
1009 | go32_ops.to_pid_to_str = go32_pid_to_str; | |
e49d4fa6 | 1010 | go32_ops.to_stratum = process_stratum; |
c35b1492 PA |
1011 | go32_ops.to_has_all_memory = default_child_has_all_memory; |
1012 | go32_ops.to_has_memory = default_child_has_memory; | |
1013 | go32_ops.to_has_stack = default_child_has_stack; | |
1014 | go32_ops.to_has_registers = default_child_has_registers; | |
1015 | go32_ops.to_has_execution = default_child_has_execution; | |
5aca5a82 PM |
1016 | |
1017 | i386_use_watchpoints (&go32_ops); | |
1018 | ||
9bb9e8ad PM |
1019 | |
1020 | i386_dr_low.set_control = go32_set_dr7; | |
1021 | i386_dr_low.set_addr = go32_set_dr; | |
9bb9e8ad | 1022 | i386_dr_low.get_status = go32_get_dr6; |
7b50312a PA |
1023 | i386_dr_low.get_control = go32_get_dr7; |
1024 | i386_dr_low.get_addr = go32_get_dr; | |
9bb9e8ad PM |
1025 | i386_set_debug_register_length (4); |
1026 | ||
e49d4fa6 | 1027 | go32_ops.to_magic = OPS_MAGIC; |
53a5351d | 1028 | |
3a45aed8 EZ |
1029 | /* Initialize child's cwd as empty to be initialized when starting |
1030 | the child. */ | |
1031 | *child_cwd = 0; | |
53a5351d JM |
1032 | |
1033 | /* Initialize child's command line storage. */ | |
1034 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 | 1035 | internal_error (__FILE__, __LINE__, |
0963b4bd MS |
1036 | _("Cannot allocate redirection storage: " |
1037 | "not enough memory.\n")); | |
0fff5247 EZ |
1038 | |
1039 | /* We are always processing GCC-compiled programs. */ | |
1040 | processing_gcc_compilation = 2; | |
e49d4fa6 SS |
1041 | } |
1042 | ||
10085bb5 EZ |
1043 | /* Return the current DOS codepage number. */ |
1044 | static int | |
1045 | dos_codepage (void) | |
1046 | { | |
1047 | __dpmi_regs regs; | |
1048 | ||
1049 | regs.x.ax = 0x6601; | |
1050 | __dpmi_int (0x21, ®s); | |
1051 | if (!(regs.x.flags & 1)) | |
1052 | return regs.x.bx & 0xffff; | |
1053 | else | |
1054 | return 437; /* default */ | |
1055 | } | |
1056 | ||
1057 | /* Limited emulation of `nl_langinfo', for charset.c. */ | |
1058 | char * | |
1059 | nl_langinfo (nl_item item) | |
1060 | { | |
1061 | char *retval; | |
1062 | ||
1063 | switch (item) | |
1064 | { | |
1065 | case CODESET: | |
1066 | { | |
1067 | /* 8 is enough for SHORT_MAX + "CP" + null. */ | |
1068 | char buf[8]; | |
1069 | int blen = sizeof (buf); | |
1070 | int needed = snprintf (buf, blen, "CP%d", dos_codepage ()); | |
1071 | ||
0963b4bd | 1072 | if (needed > blen) /* Should never happen. */ |
10085bb5 EZ |
1073 | buf[0] = 0; |
1074 | retval = xstrdup (buf); | |
1075 | } | |
1076 | break; | |
1077 | default: | |
1078 | retval = xstrdup (""); | |
1079 | break; | |
1080 | } | |
1081 | return retval; | |
1082 | } | |
1083 | ||
10ba702d EZ |
1084 | unsigned short windows_major, windows_minor; |
1085 | ||
1086 | /* Compute the version Windows reports via Int 2Fh/AX=1600h. */ | |
1087 | static void | |
1088 | go32_get_windows_version(void) | |
1089 | { | |
1090 | __dpmi_regs r; | |
1091 | ||
1092 | r.x.ax = 0x1600; | |
1093 | __dpmi_int(0x2f, &r); | |
1094 | if (r.h.al > 2 && r.h.al != 0x80 && r.h.al != 0xff | |
1095 | && (r.h.al > 3 || r.h.ah > 0)) | |
1096 | { | |
1097 | windows_major = r.h.al; | |
1098 | windows_minor = r.h.ah; | |
1099 | } | |
1100 | else | |
1101 | windows_major = 0xff; /* meaning no Windows */ | |
1102 | } | |
1103 | ||
1104 | /* A subroutine of go32_sysinfo to display memory info. */ | |
1105 | static void | |
1106 | print_mem (unsigned long datum, const char *header, int in_pages_p) | |
1107 | { | |
1108 | if (datum != 0xffffffffUL) | |
1109 | { | |
1110 | if (in_pages_p) | |
1111 | datum <<= 12; | |
1112 | puts_filtered (header); | |
1113 | if (datum > 1024) | |
1114 | { | |
1115 | printf_filtered ("%lu KB", datum >> 10); | |
1116 | if (datum > 1024 * 1024) | |
1117 | printf_filtered (" (%lu MB)", datum >> 20); | |
1118 | } | |
1119 | else | |
1120 | printf_filtered ("%lu Bytes", datum); | |
1121 | puts_filtered ("\n"); | |
1122 | } | |
1123 | } | |
1124 | ||
1125 | /* Display assorted information about the underlying OS. */ | |
1126 | static void | |
1127 | go32_sysinfo (char *arg, int from_tty) | |
1128 | { | |
d647eed6 EZ |
1129 | static const char test_pattern[] = |
1130 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf" | |
1131 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf" | |
1132 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeafdeadbeaf"; | |
10ba702d EZ |
1133 | struct utsname u; |
1134 | char cpuid_vendor[13]; | |
1135 | unsigned cpuid_max = 0, cpuid_eax, cpuid_ebx, cpuid_ecx, cpuid_edx; | |
1136 | unsigned true_dos_version = _get_dos_version (1); | |
1137 | unsigned advertized_dos_version = ((unsigned int)_osmajor << 8) | _osminor; | |
1138 | int dpmi_flags; | |
1139 | char dpmi_vendor_info[129]; | |
d647eed6 | 1140 | int dpmi_vendor_available; |
10ba702d EZ |
1141 | __dpmi_version_ret dpmi_version_data; |
1142 | long eflags; | |
1143 | __dpmi_free_mem_info mem_info; | |
1144 | __dpmi_regs regs; | |
1145 | ||
1146 | cpuid_vendor[0] = '\0'; | |
1147 | if (uname (&u)) | |
1148 | strcpy (u.machine, "Unknown x86"); | |
1149 | else if (u.machine[0] == 'i' && u.machine[1] > 4) | |
1150 | { | |
1151 | /* CPUID with EAX = 0 returns the Vendor ID. */ | |
4d157a3d MF |
1152 | #if 0 |
1153 | /* Ideally we would use i386_cpuid(), but it needs someone to run | |
1154 | native tests first to make sure things actually work. They should. | |
1155 | http://sourceware.org/ml/gdb-patches/2013-05/msg00164.html */ | |
1156 | unsigned int eax, ebx, ecx, edx; | |
1157 | ||
1158 | if (i386_cpuid (0, &eax, &ebx, &ecx, &edx)) | |
1159 | { | |
1160 | cpuid_max = eax; | |
1161 | memcpy (&vendor[0], &ebx, 4); | |
1162 | memcpy (&vendor[4], &ecx, 4); | |
1163 | memcpy (&vendor[8], &edx, 4); | |
1164 | cpuid_vendor[12] = '\0'; | |
1165 | } | |
1166 | #else | |
10ba702d EZ |
1167 | __asm__ __volatile__ ("xorl %%ebx, %%ebx;" |
1168 | "xorl %%ecx, %%ecx;" | |
1169 | "xorl %%edx, %%edx;" | |
1170 | "movl $0, %%eax;" | |
1171 | "cpuid;" | |
1172 | "movl %%ebx, %0;" | |
1173 | "movl %%edx, %1;" | |
1174 | "movl %%ecx, %2;" | |
1175 | "movl %%eax, %3;" | |
1176 | : "=m" (cpuid_vendor[0]), | |
1177 | "=m" (cpuid_vendor[4]), | |
1178 | "=m" (cpuid_vendor[8]), | |
1179 | "=m" (cpuid_max) | |
1180 | : | |
1181 | : "%eax", "%ebx", "%ecx", "%edx"); | |
1182 | cpuid_vendor[12] = '\0'; | |
4d157a3d | 1183 | #endif |
10ba702d EZ |
1184 | } |
1185 | ||
1186 | printf_filtered ("CPU Type.......................%s", u.machine); | |
1187 | if (cpuid_vendor[0]) | |
1188 | printf_filtered (" (%s)", cpuid_vendor); | |
1189 | puts_filtered ("\n"); | |
1190 | ||
1191 | /* CPUID with EAX = 1 returns processor signature and features. */ | |
1192 | if (cpuid_max >= 1) | |
1193 | { | |
1194 | static char *brand_name[] = { | |
1195 | "", | |
1196 | " Celeron", | |
1197 | " III", | |
1198 | " III Xeon", | |
1199 | "", "", "", "", | |
1200 | " 4" | |
1201 | }; | |
1202 | char cpu_string[80]; | |
1203 | char cpu_brand[20]; | |
1204 | unsigned brand_idx; | |
1205 | int intel_p = strcmp (cpuid_vendor, "GenuineIntel") == 0; | |
1206 | int amd_p = strcmp (cpuid_vendor, "AuthenticAMD") == 0; | |
1207 | unsigned cpu_family, cpu_model; | |
1208 | ||
4d157a3d MF |
1209 | #if 0 |
1210 | /* See comment above about cpuid usage. */ | |
1211 | i386_cpuid (1, &cpuid_eax, &cpuid_ebx, NULL, &cpuid_edx); | |
1212 | #else | |
10ba702d EZ |
1213 | __asm__ __volatile__ ("movl $1, %%eax;" |
1214 | "cpuid;" | |
1215 | : "=a" (cpuid_eax), | |
1216 | "=b" (cpuid_ebx), | |
1217 | "=d" (cpuid_edx) | |
1218 | : | |
1219 | : "%ecx"); | |
4d157a3d | 1220 | #endif |
10ba702d EZ |
1221 | brand_idx = cpuid_ebx & 0xff; |
1222 | cpu_family = (cpuid_eax >> 8) & 0xf; | |
1223 | cpu_model = (cpuid_eax >> 4) & 0xf; | |
1224 | cpu_brand[0] = '\0'; | |
1225 | if (intel_p) | |
1226 | { | |
1227 | if (brand_idx > 0 | |
1228 | && brand_idx < sizeof(brand_name)/sizeof(brand_name[0]) | |
1229 | && *brand_name[brand_idx]) | |
1230 | strcpy (cpu_brand, brand_name[brand_idx]); | |
1231 | else if (cpu_family == 5) | |
1232 | { | |
1233 | if (((cpuid_eax >> 12) & 3) == 0 && cpu_model == 4) | |
1234 | strcpy (cpu_brand, " MMX"); | |
1235 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 1) | |
1236 | strcpy (cpu_brand, " OverDrive"); | |
1237 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 2) | |
1238 | strcpy (cpu_brand, " Dual"); | |
1239 | } | |
1240 | else if (cpu_family == 6 && cpu_model < 8) | |
1241 | { | |
1242 | switch (cpu_model) | |
1243 | { | |
1244 | case 1: | |
1245 | strcpy (cpu_brand, " Pro"); | |
1246 | break; | |
1247 | case 3: | |
1248 | strcpy (cpu_brand, " II"); | |
1249 | break; | |
1250 | case 5: | |
1251 | strcpy (cpu_brand, " II Xeon"); | |
1252 | break; | |
1253 | case 6: | |
1254 | strcpy (cpu_brand, " Celeron"); | |
1255 | break; | |
1256 | case 7: | |
1257 | strcpy (cpu_brand, " III"); | |
1258 | break; | |
1259 | } | |
1260 | } | |
1261 | } | |
1262 | else if (amd_p) | |
1263 | { | |
1264 | switch (cpu_family) | |
1265 | { | |
1266 | case 4: | |
1267 | strcpy (cpu_brand, "486/5x86"); | |
1268 | break; | |
1269 | case 5: | |
1270 | switch (cpu_model) | |
1271 | { | |
1272 | case 0: | |
1273 | case 1: | |
1274 | case 2: | |
1275 | case 3: | |
1276 | strcpy (cpu_brand, "-K5"); | |
1277 | break; | |
1278 | case 6: | |
1279 | case 7: | |
1280 | strcpy (cpu_brand, "-K6"); | |
1281 | break; | |
1282 | case 8: | |
1283 | strcpy (cpu_brand, "-K6-2"); | |
1284 | break; | |
1285 | case 9: | |
1286 | strcpy (cpu_brand, "-K6-III"); | |
1287 | break; | |
1288 | } | |
1289 | break; | |
1290 | case 6: | |
1291 | switch (cpu_model) | |
1292 | { | |
1293 | case 1: | |
1294 | case 2: | |
1295 | case 4: | |
1296 | strcpy (cpu_brand, " Athlon"); | |
1297 | break; | |
1298 | case 3: | |
1299 | strcpy (cpu_brand, " Duron"); | |
1300 | break; | |
1301 | } | |
1302 | break; | |
1303 | } | |
1304 | } | |
8c042590 PM |
1305 | xsnprintf (cpu_string, sizeof (cpu_string), "%s%s Model %d Stepping %d", |
1306 | intel_p ? "Pentium" : (amd_p ? "AMD" : "ix86"), | |
1307 | cpu_brand, cpu_model, cpuid_eax & 0xf); | |
10ba702d EZ |
1308 | printfi_filtered (31, "%s\n", cpu_string); |
1309 | if (((cpuid_edx & (6 | (0x0d << 23))) != 0) | |
1310 | || ((cpuid_edx & 1) == 0) | |
1311 | || (amd_p && (cpuid_edx & (3 << 30)) != 0)) | |
1312 | { | |
1313 | puts_filtered ("CPU Features..................."); | |
1314 | /* We only list features which might be useful in the DPMI | |
1315 | environment. */ | |
1316 | if ((cpuid_edx & 1) == 0) | |
0963b4bd | 1317 | puts_filtered ("No FPU "); /* It's unusual to not have an FPU. */ |
10ba702d EZ |
1318 | if ((cpuid_edx & (1 << 1)) != 0) |
1319 | puts_filtered ("VME "); | |
1320 | if ((cpuid_edx & (1 << 2)) != 0) | |
1321 | puts_filtered ("DE "); | |
1322 | if ((cpuid_edx & (1 << 4)) != 0) | |
1323 | puts_filtered ("TSC "); | |
1324 | if ((cpuid_edx & (1 << 23)) != 0) | |
1325 | puts_filtered ("MMX "); | |
1326 | if ((cpuid_edx & (1 << 25)) != 0) | |
1327 | puts_filtered ("SSE "); | |
1328 | if ((cpuid_edx & (1 << 26)) != 0) | |
1329 | puts_filtered ("SSE2 "); | |
1330 | if (amd_p) | |
1331 | { | |
1332 | if ((cpuid_edx & (1 << 31)) != 0) | |
1333 | puts_filtered ("3DNow! "); | |
1334 | if ((cpuid_edx & (1 << 30)) != 0) | |
1335 | puts_filtered ("3DNow!Ext"); | |
1336 | } | |
1337 | puts_filtered ("\n"); | |
1338 | } | |
1339 | } | |
1340 | puts_filtered ("\n"); | |
1341 | printf_filtered ("DOS Version....................%s %s.%s", | |
1342 | _os_flavor, u.release, u.version); | |
1343 | if (true_dos_version != advertized_dos_version) | |
1344 | printf_filtered (" (disguised as v%d.%d)", _osmajor, _osminor); | |
1345 | puts_filtered ("\n"); | |
1346 | if (!windows_major) | |
1347 | go32_get_windows_version (); | |
1348 | if (windows_major != 0xff) | |
1349 | { | |
1350 | const char *windows_flavor; | |
1351 | ||
1352 | printf_filtered ("Windows Version................%d.%02d (Windows ", | |
1353 | windows_major, windows_minor); | |
1354 | switch (windows_major) | |
1355 | { | |
1356 | case 3: | |
1357 | windows_flavor = "3.X"; | |
1358 | break; | |
1359 | case 4: | |
1360 | switch (windows_minor) | |
1361 | { | |
1362 | case 0: | |
1363 | windows_flavor = "95, 95A, or 95B"; | |
1364 | break; | |
1365 | case 3: | |
1366 | windows_flavor = "95B OSR2.1 or 95C OSR2.5"; | |
1367 | break; | |
1368 | case 10: | |
1369 | windows_flavor = "98 or 98 SE"; | |
1370 | break; | |
1371 | case 90: | |
1372 | windows_flavor = "ME"; | |
1373 | break; | |
1374 | default: | |
1375 | windows_flavor = "9X"; | |
1376 | break; | |
1377 | } | |
1378 | break; | |
1379 | default: | |
1380 | windows_flavor = "??"; | |
1381 | break; | |
1382 | } | |
1383 | printf_filtered ("%s)\n", windows_flavor); | |
1384 | } | |
1385 | else if (true_dos_version == 0x532 && advertized_dos_version == 0x500) | |
0963b4bd MS |
1386 | printf_filtered ("Windows Version................" |
1387 | "Windows NT family (W2K/XP/W2K3/Vista/W2K8)\n"); | |
10ba702d | 1388 | puts_filtered ("\n"); |
d647eed6 EZ |
1389 | /* On some versions of Windows, __dpmi_get_capabilities returns |
1390 | zero, but the buffer is not filled with info, so we fill the | |
1391 | buffer with a known pattern and test for it afterwards. */ | |
1392 | memcpy (dpmi_vendor_info, test_pattern, sizeof(dpmi_vendor_info)); | |
1393 | dpmi_vendor_available = | |
1394 | __dpmi_get_capabilities (&dpmi_flags, dpmi_vendor_info); | |
1395 | if (dpmi_vendor_available == 0 | |
1396 | && memcmp (dpmi_vendor_info, test_pattern, | |
1397 | sizeof(dpmi_vendor_info)) != 0) | |
10ba702d EZ |
1398 | { |
1399 | /* The DPMI spec says the vendor string should be ASCIIZ, but | |
1400 | I don't trust the vendors to follow that... */ | |
1401 | if (!memchr (&dpmi_vendor_info[2], 0, 126)) | |
1402 | dpmi_vendor_info[128] = '\0'; | |
0963b4bd MS |
1403 | printf_filtered ("DPMI Host......................" |
1404 | "%s v%d.%d (capabilities: %#x)\n", | |
10ba702d EZ |
1405 | &dpmi_vendor_info[2], |
1406 | (unsigned)dpmi_vendor_info[0], | |
1407 | (unsigned)dpmi_vendor_info[1], | |
1408 | ((unsigned)dpmi_flags & 0x7f)); | |
1409 | } | |
d647eed6 EZ |
1410 | else |
1411 | printf_filtered ("DPMI Host......................(Info not available)\n"); | |
10ba702d EZ |
1412 | __dpmi_get_version (&dpmi_version_data); |
1413 | printf_filtered ("DPMI Version...................%d.%02d\n", | |
1414 | dpmi_version_data.major, dpmi_version_data.minor); | |
0963b4bd MS |
1415 | printf_filtered ("DPMI Info......................" |
1416 | "%s-bit DPMI, with%s Virtual Memory support\n", | |
10ba702d EZ |
1417 | (dpmi_version_data.flags & 1) ? "32" : "16", |
1418 | (dpmi_version_data.flags & 4) ? "" : "out"); | |
1419 | printfi_filtered (31, "Interrupts reflected to %s mode\n", | |
1420 | (dpmi_version_data.flags & 2) ? "V86" : "Real"); | |
1421 | printfi_filtered (31, "Processor type: i%d86\n", | |
1422 | dpmi_version_data.cpu); | |
1423 | printfi_filtered (31, "PIC base interrupt: Master: %#x Slave: %#x\n", | |
1424 | dpmi_version_data.master_pic, dpmi_version_data.slave_pic); | |
1425 | ||
1426 | /* a_tss is only initialized when the debuggee is first run. */ | |
1427 | if (prog_has_started) | |
1428 | { | |
1429 | __asm__ __volatile__ ("pushfl ; popl %0" : "=g" (eflags)); | |
0963b4bd MS |
1430 | printf_filtered ("Protection....................." |
1431 | "Ring %d (in %s), with%s I/O protection\n", | |
10ba702d EZ |
1432 | a_tss.tss_cs & 3, (a_tss.tss_cs & 4) ? "LDT" : "GDT", |
1433 | (a_tss.tss_cs & 3) > ((eflags >> 12) & 3) ? "" : "out"); | |
1434 | } | |
1435 | puts_filtered ("\n"); | |
1436 | __dpmi_get_free_memory_information (&mem_info); | |
1437 | print_mem (mem_info.total_number_of_physical_pages, | |
1438 | "DPMI Total Physical Memory.....", 1); | |
1439 | print_mem (mem_info.total_number_of_free_pages, | |
1440 | "DPMI Free Physical Memory......", 1); | |
1441 | print_mem (mem_info.size_of_paging_file_partition_in_pages, | |
1442 | "DPMI Swap Space................", 1); | |
1443 | print_mem (mem_info.linear_address_space_size_in_pages, | |
1444 | "DPMI Total Linear Address Size.", 1); | |
1445 | print_mem (mem_info.free_linear_address_space_in_pages, | |
1446 | "DPMI Free Linear Address Size..", 1); | |
1447 | print_mem (mem_info.largest_available_free_block_in_bytes, | |
1448 | "DPMI Largest Free Memory Block.", 0); | |
1449 | ||
1450 | regs.h.ah = 0x48; | |
1451 | regs.x.bx = 0xffff; | |
1452 | __dpmi_int (0x21, ®s); | |
1453 | print_mem (regs.x.bx << 4, "Free DOS Memory................", 0); | |
1454 | regs.x.ax = 0x5800; | |
1455 | __dpmi_int (0x21, ®s); | |
1456 | if ((regs.x.flags & 1) == 0) | |
1457 | { | |
1458 | static const char *dos_hilo[] = { | |
1459 | "Low", "", "", "", "High", "", "", "", "High, then Low" | |
1460 | }; | |
1461 | static const char *dos_fit[] = { | |
1462 | "First", "Best", "Last" | |
1463 | }; | |
1464 | int hilo_idx = (regs.x.ax >> 4) & 0x0f; | |
1465 | int fit_idx = regs.x.ax & 0x0f; | |
1466 | ||
1467 | if (hilo_idx > 8) | |
1468 | hilo_idx = 0; | |
1469 | if (fit_idx > 2) | |
1470 | fit_idx = 0; | |
1471 | printf_filtered ("DOS Memory Allocation..........%s memory, %s fit\n", | |
1472 | dos_hilo[hilo_idx], dos_fit[fit_idx]); | |
1473 | regs.x.ax = 0x5802; | |
1474 | __dpmi_int (0x21, ®s); | |
1475 | if ((regs.x.flags & 1) != 0) | |
1476 | regs.h.al = 0; | |
1477 | printfi_filtered (31, "UMBs %sin DOS memory chain\n", | |
1478 | regs.h.al == 0 ? "not " : ""); | |
1479 | } | |
1480 | } | |
1481 | ||
1482 | struct seg_descr { | |
9d0b3624 PA |
1483 | unsigned short limit0; |
1484 | unsigned short base0; | |
1485 | unsigned char base1; | |
1486 | unsigned stype:5; | |
1487 | unsigned dpl:2; | |
1488 | unsigned present:1; | |
1489 | unsigned limit1:4; | |
1490 | unsigned available:1; | |
1491 | unsigned dummy:1; | |
1492 | unsigned bit32:1; | |
1493 | unsigned page_granular:1; | |
1494 | unsigned char base2; | |
1495 | } __attribute__ ((packed)); | |
10ba702d EZ |
1496 | |
1497 | struct gate_descr { | |
9d0b3624 PA |
1498 | unsigned short offset0; |
1499 | unsigned short selector; | |
1500 | unsigned param_count:5; | |
1501 | unsigned dummy:3; | |
1502 | unsigned stype:5; | |
1503 | unsigned dpl:2; | |
1504 | unsigned present:1; | |
1505 | unsigned short offset1; | |
1506 | } __attribute__ ((packed)); | |
10ba702d EZ |
1507 | |
1508 | /* Read LEN bytes starting at logical address ADDR, and put the result | |
1509 | into DEST. Return 1 if success, zero if not. */ | |
1510 | static int | |
1511 | read_memory_region (unsigned long addr, void *dest, size_t len) | |
1512 | { | |
1513 | unsigned long dos_ds_limit = __dpmi_get_segment_limit (_dos_ds); | |
9f20bf26 | 1514 | int retval = 1; |
10ba702d EZ |
1515 | |
1516 | /* For the low memory, we can simply use _dos_ds. */ | |
1517 | if (addr <= dos_ds_limit - len) | |
1518 | dosmemget (addr, len, dest); | |
1519 | else | |
1520 | { | |
1521 | /* For memory above 1MB we need to set up a special segment to | |
1522 | be able to access that memory. */ | |
1523 | int sel = __dpmi_allocate_ldt_descriptors (1); | |
1524 | ||
9f20bf26 EZ |
1525 | if (sel <= 0) |
1526 | retval = 0; | |
1527 | else | |
1528 | { | |
1529 | int access_rights = __dpmi_get_descriptor_access_rights (sel); | |
1530 | size_t segment_limit = len - 1; | |
1531 | ||
1532 | /* Make sure the crucial bits in the descriptor access | |
1533 | rights are set correctly. Some DPMI providers might barf | |
1534 | if we set the segment limit to something that is not an | |
1535 | integral multiple of 4KB pages if the granularity bit is | |
1536 | not set to byte-granular, even though the DPMI spec says | |
1537 | it's the host's responsibility to set that bit correctly. */ | |
1538 | if (len > 1024 * 1024) | |
1539 | { | |
1540 | access_rights |= 0x8000; | |
1541 | /* Page-granular segments should have the low 12 bits of | |
1542 | the limit set. */ | |
1543 | segment_limit |= 0xfff; | |
1544 | } | |
1545 | else | |
1546 | access_rights &= ~0x8000; | |
1547 | ||
1548 | if (__dpmi_set_segment_base_address (sel, addr) != -1 | |
1549 | && __dpmi_set_descriptor_access_rights (sel, access_rights) != -1 | |
2033c18a EZ |
1550 | && __dpmi_set_segment_limit (sel, segment_limit) != -1 |
1551 | /* W2K silently fails to set the segment limit, leaving | |
1552 | it at zero; this test avoids the resulting crash. */ | |
1553 | && __dpmi_get_segment_limit (sel) >= segment_limit) | |
9f20bf26 EZ |
1554 | movedata (sel, 0, _my_ds (), (unsigned)dest, len); |
1555 | else | |
1556 | retval = 0; | |
1557 | ||
1558 | __dpmi_free_ldt_descriptor (sel); | |
1559 | } | |
10ba702d | 1560 | } |
9f20bf26 | 1561 | return retval; |
10ba702d EZ |
1562 | } |
1563 | ||
1564 | /* Get a segment descriptor stored at index IDX in the descriptor | |
1565 | table whose base address is TABLE_BASE. Return the descriptor | |
1566 | type, or -1 if failure. */ | |
1567 | static int | |
1568 | get_descriptor (unsigned long table_base, int idx, void *descr) | |
1569 | { | |
1570 | unsigned long addr = table_base + idx * 8; /* 8 bytes per entry */ | |
1571 | ||
1572 | if (read_memory_region (addr, descr, 8)) | |
1573 | return (int)((struct seg_descr *)descr)->stype; | |
1574 | return -1; | |
1575 | } | |
1576 | ||
1577 | struct dtr_reg { | |
1578 | unsigned short limit __attribute__((packed)); | |
1579 | unsigned long base __attribute__((packed)); | |
1580 | }; | |
1581 | ||
1582 | /* Display a segment descriptor stored at index IDX in a descriptor | |
1583 | table whose type is TYPE and whose base address is BASE_ADDR. If | |
1584 | FORCE is non-zero, display even invalid descriptors. */ | |
1585 | static void | |
1586 | display_descriptor (unsigned type, unsigned long base_addr, int idx, int force) | |
1587 | { | |
1588 | struct seg_descr descr; | |
1589 | struct gate_descr gate; | |
1590 | ||
1591 | /* Get the descriptor from the table. */ | |
1592 | if (idx == 0 && type == 0) | |
1593 | puts_filtered ("0x000: null descriptor\n"); | |
1594 | else if (get_descriptor (base_addr, idx, &descr) != -1) | |
1595 | { | |
1596 | /* For each type of descriptor table, this has a bit set if the | |
1597 | corresponding type of selectors is valid in that table. */ | |
1598 | static unsigned allowed_descriptors[] = { | |
1599 | 0xffffdafeL, /* GDT */ | |
1600 | 0x0000c0e0L, /* IDT */ | |
1601 | 0xffffdafaL /* LDT */ | |
1602 | }; | |
1603 | ||
1604 | /* If the program hasn't started yet, assume the debuggee will | |
1605 | have the same CPL as the debugger. */ | |
1606 | int cpl = prog_has_started ? (a_tss.tss_cs & 3) : _my_cs () & 3; | |
1607 | unsigned long limit = (descr.limit1 << 16) | descr.limit0; | |
1608 | ||
1609 | if (descr.present | |
1610 | && (allowed_descriptors[type] & (1 << descr.stype)) != 0) | |
1611 | { | |
1612 | printf_filtered ("0x%03x: ", | |
1613 | type == 1 | |
1614 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); | |
1615 | if (descr.page_granular) | |
1616 | limit = (limit << 12) | 0xfff; /* big segment: low 12 bit set */ | |
1617 | if (descr.stype == 1 || descr.stype == 2 || descr.stype == 3 | |
1618 | || descr.stype == 9 || descr.stype == 11 | |
1619 | || (descr.stype >= 16 && descr.stype < 32)) | |
1620 | printf_filtered ("base=0x%02x%02x%04x limit=0x%08lx", | |
1621 | descr.base2, descr.base1, descr.base0, limit); | |
1622 | ||
1623 | switch (descr.stype) | |
1624 | { | |
1625 | case 1: | |
1626 | case 3: | |
1627 | printf_filtered (" 16-bit TSS (task %sactive)", | |
1628 | descr.stype == 3 ? "" : "in"); | |
1629 | break; | |
1630 | case 2: | |
1631 | puts_filtered (" LDT"); | |
1632 | break; | |
1633 | case 4: | |
1634 | memcpy (&gate, &descr, sizeof gate); | |
1635 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1636 | gate.selector, gate.offset1, gate.offset0); | |
1637 | printf_filtered (" 16-bit Call Gate (params=%d)", | |
1638 | gate.param_count); | |
1639 | break; | |
1640 | case 5: | |
1641 | printf_filtered ("TSS selector=0x%04x", descr.base0); | |
1642 | printfi_filtered (16, "Task Gate"); | |
1643 | break; | |
1644 | case 6: | |
1645 | case 7: | |
1646 | memcpy (&gate, &descr, sizeof gate); | |
1647 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1648 | gate.selector, gate.offset1, gate.offset0); | |
1649 | printf_filtered (" 16-bit %s Gate", | |
1650 | descr.stype == 6 ? "Interrupt" : "Trap"); | |
1651 | break; | |
1652 | case 9: | |
1653 | case 11: | |
1654 | printf_filtered (" 32-bit TSS (task %sactive)", | |
1655 | descr.stype == 3 ? "" : "in"); | |
1656 | break; | |
1657 | case 12: | |
1658 | memcpy (&gate, &descr, sizeof gate); | |
1659 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1660 | gate.selector, gate.offset1, gate.offset0); | |
1661 | printf_filtered (" 32-bit Call Gate (params=%d)", | |
1662 | gate.param_count); | |
1663 | break; | |
1664 | case 14: | |
1665 | case 15: | |
1666 | memcpy (&gate, &descr, sizeof gate); | |
1667 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1668 | gate.selector, gate.offset1, gate.offset0); | |
1669 | printf_filtered (" 32-bit %s Gate", | |
1670 | descr.stype == 14 ? "Interrupt" : "Trap"); | |
1671 | break; | |
1672 | case 16: /* data segments */ | |
1673 | case 17: | |
1674 | case 18: | |
1675 | case 19: | |
1676 | case 20: | |
1677 | case 21: | |
1678 | case 22: | |
1679 | case 23: | |
1680 | printf_filtered (" %s-bit Data (%s Exp-%s%s)", | |
1681 | descr.bit32 ? "32" : "16", | |
0963b4bd MS |
1682 | descr.stype & 2 |
1683 | ? "Read/Write," : "Read-Only, ", | |
10ba702d EZ |
1684 | descr.stype & 4 ? "down" : "up", |
1685 | descr.stype & 1 ? "" : ", N.Acc"); | |
1686 | break; | |
1687 | case 24: /* code segments */ | |
1688 | case 25: | |
1689 | case 26: | |
1690 | case 27: | |
1691 | case 28: | |
1692 | case 29: | |
1693 | case 30: | |
1694 | case 31: | |
1695 | printf_filtered (" %s-bit Code (%s, %sConf%s)", | |
1696 | descr.bit32 ? "32" : "16", | |
1697 | descr.stype & 2 ? "Exec/Read" : "Exec-Only", | |
1698 | descr.stype & 4 ? "" : "N.", | |
1699 | descr.stype & 1 ? "" : ", N.Acc"); | |
1700 | break; | |
1701 | default: | |
1702 | printf_filtered ("Unknown type 0x%02x", descr.stype); | |
1703 | break; | |
1704 | } | |
1705 | puts_filtered ("\n"); | |
1706 | } | |
1707 | else if (force) | |
1708 | { | |
1709 | printf_filtered ("0x%03x: ", | |
1710 | type == 1 | |
1711 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); | |
1712 | if (!descr.present) | |
1713 | puts_filtered ("Segment not present\n"); | |
1714 | else | |
1715 | printf_filtered ("Segment type 0x%02x is invalid in this table\n", | |
1716 | descr.stype); | |
1717 | } | |
1718 | } | |
1719 | else if (force) | |
1720 | printf_filtered ("0x%03x: Cannot read this descriptor\n", idx); | |
1721 | } | |
1722 | ||
1723 | static void | |
1724 | go32_sldt (char *arg, int from_tty) | |
1725 | { | |
1726 | struct dtr_reg gdtr; | |
1727 | unsigned short ldtr = 0; | |
1728 | int ldt_idx; | |
1729 | struct seg_descr ldt_descr; | |
1730 | long ldt_entry = -1L; | |
1731 | int cpl = (prog_has_started ? a_tss.tss_cs : _my_cs ()) & 3; | |
1732 | ||
1733 | if (arg && *arg) | |
1734 | { | |
529480d0 | 1735 | arg = skip_spaces (arg); |
10ba702d EZ |
1736 | |
1737 | if (*arg) | |
1738 | { | |
1739 | ldt_entry = parse_and_eval_long (arg); | |
1740 | if (ldt_entry < 0 | |
1741 | || (ldt_entry & 4) == 0 | |
1742 | || (ldt_entry & 3) != (cpl & 3)) | |
8a3fe4f8 | 1743 | error (_("Invalid LDT entry 0x%03lx."), (unsigned long)ldt_entry); |
10ba702d EZ |
1744 | } |
1745 | } | |
1746 | ||
1747 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1748 | __asm__ __volatile__ ("sldt %0" : "=m" (ldtr) : /* no inputs */ ); | |
1749 | ldt_idx = ldtr / 8; | |
1750 | if (ldt_idx == 0) | |
1751 | puts_filtered ("There is no LDT.\n"); | |
1752 | /* LDT's entry in the GDT must have the type LDT, which is 2. */ | |
1753 | else if (get_descriptor (gdtr.base, ldt_idx, &ldt_descr) != 2) | |
1754 | printf_filtered ("LDT is present (at %#x), but unreadable by GDB.\n", | |
1755 | ldt_descr.base0 | |
1756 | | (ldt_descr.base1 << 16) | |
1757 | | (ldt_descr.base2 << 24)); | |
1758 | else | |
1759 | { | |
1760 | unsigned base = | |
1761 | ldt_descr.base0 | |
1762 | | (ldt_descr.base1 << 16) | |
1763 | | (ldt_descr.base2 << 24); | |
1764 | unsigned limit = ldt_descr.limit0 | (ldt_descr.limit1 << 16); | |
1765 | int max_entry; | |
1766 | ||
1767 | if (ldt_descr.page_granular) | |
1768 | /* Page-granular segments must have the low 12 bits of their | |
1769 | limit set. */ | |
1770 | limit = (limit << 12) | 0xfff; | |
1771 | /* LDT cannot have more than 8K 8-byte entries, i.e. more than | |
1772 | 64KB. */ | |
1773 | if (limit > 0xffff) | |
1774 | limit = 0xffff; | |
1775 | ||
1776 | max_entry = (limit + 1) / 8; | |
1777 | ||
1778 | if (ldt_entry >= 0) | |
1779 | { | |
1780 | if (ldt_entry > limit) | |
8a3fe4f8 | 1781 | error (_("Invalid LDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1782 | (unsigned long)ldt_entry, limit); |
10ba702d EZ |
1783 | |
1784 | display_descriptor (ldt_descr.stype, base, ldt_entry / 8, 1); | |
1785 | } | |
1786 | else | |
1787 | { | |
1788 | int i; | |
1789 | ||
1790 | for (i = 0; i < max_entry; i++) | |
1791 | display_descriptor (ldt_descr.stype, base, i, 0); | |
1792 | } | |
1793 | } | |
1794 | } | |
1795 | ||
1796 | static void | |
1797 | go32_sgdt (char *arg, int from_tty) | |
1798 | { | |
1799 | struct dtr_reg gdtr; | |
1800 | long gdt_entry = -1L; | |
1801 | int max_entry; | |
1802 | ||
1803 | if (arg && *arg) | |
1804 | { | |
529480d0 | 1805 | arg = skip_spaces (arg); |
10ba702d EZ |
1806 | |
1807 | if (*arg) | |
1808 | { | |
1809 | gdt_entry = parse_and_eval_long (arg); | |
1810 | if (gdt_entry < 0 || (gdt_entry & 7) != 0) | |
0963b4bd MS |
1811 | error (_("Invalid GDT entry 0x%03lx: " |
1812 | "not an integral multiple of 8."), | |
ccbc3e6f | 1813 | (unsigned long)gdt_entry); |
10ba702d EZ |
1814 | } |
1815 | } | |
1816 | ||
1817 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1818 | max_entry = (gdtr.limit + 1) / 8; | |
1819 | ||
1820 | if (gdt_entry >= 0) | |
1821 | { | |
1822 | if (gdt_entry > gdtr.limit) | |
8a3fe4f8 | 1823 | error (_("Invalid GDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1824 | (unsigned long)gdt_entry, gdtr.limit); |
10ba702d EZ |
1825 | |
1826 | display_descriptor (0, gdtr.base, gdt_entry / 8, 1); | |
1827 | } | |
1828 | else | |
1829 | { | |
1830 | int i; | |
1831 | ||
1832 | for (i = 0; i < max_entry; i++) | |
1833 | display_descriptor (0, gdtr.base, i, 0); | |
1834 | } | |
1835 | } | |
1836 | ||
1837 | static void | |
1838 | go32_sidt (char *arg, int from_tty) | |
1839 | { | |
1840 | struct dtr_reg idtr; | |
1841 | long idt_entry = -1L; | |
1842 | int max_entry; | |
1843 | ||
1844 | if (arg && *arg) | |
1845 | { | |
529480d0 | 1846 | arg = skip_spaces (arg); |
10ba702d EZ |
1847 | |
1848 | if (*arg) | |
1849 | { | |
1850 | idt_entry = parse_and_eval_long (arg); | |
1851 | if (idt_entry < 0) | |
8a3fe4f8 | 1852 | error (_("Invalid (negative) IDT entry %ld."), idt_entry); |
10ba702d EZ |
1853 | } |
1854 | } | |
1855 | ||
1856 | __asm__ __volatile__ ("sidt %0" : "=m" (idtr) : /* no inputs */ ); | |
1857 | max_entry = (idtr.limit + 1) / 8; | |
0963b4bd | 1858 | if (max_entry > 0x100) /* No more than 256 entries. */ |
10ba702d EZ |
1859 | max_entry = 0x100; |
1860 | ||
1861 | if (idt_entry >= 0) | |
1862 | { | |
1863 | if (idt_entry > idtr.limit) | |
8a3fe4f8 | 1864 | error (_("Invalid IDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1865 | (unsigned long)idt_entry, idtr.limit); |
10ba702d EZ |
1866 | |
1867 | display_descriptor (1, idtr.base, idt_entry, 1); | |
1868 | } | |
1869 | else | |
1870 | { | |
1871 | int i; | |
1872 | ||
1873 | for (i = 0; i < max_entry; i++) | |
1874 | display_descriptor (1, idtr.base, i, 0); | |
1875 | } | |
1876 | } | |
1877 | ||
9f20bf26 EZ |
1878 | /* Cached linear address of the base of the page directory. For |
1879 | now, available only under CWSDPMI. Code based on ideas and | |
1880 | suggestions from Charles Sandmann <sandmann@clio.rice.edu>. */ | |
1881 | static unsigned long pdbr; | |
1882 | ||
1883 | static unsigned long | |
1884 | get_cr3 (void) | |
1885 | { | |
1886 | unsigned offset; | |
1887 | unsigned taskreg; | |
1888 | unsigned long taskbase, cr3; | |
1889 | struct dtr_reg gdtr; | |
1890 | ||
1891 | if (pdbr > 0 && pdbr <= 0xfffff) | |
1892 | return pdbr; | |
1893 | ||
1894 | /* Get the linear address of GDT and the Task Register. */ | |
1895 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1896 | __asm__ __volatile__ ("str %0" : "=m" (taskreg) : /* no inputs */ ); | |
1897 | ||
1898 | /* Task Register is a segment selector for the TSS of the current | |
1899 | task. Therefore, it can be used as an index into the GDT to get | |
1900 | at the segment descriptor for the TSS. To get the index, reset | |
1901 | the low 3 bits of the selector (which give the CPL). Add 2 to the | |
1902 | offset to point to the 3 low bytes of the base address. */ | |
1903 | offset = gdtr.base + (taskreg & 0xfff8) + 2; | |
1904 | ||
1905 | ||
1906 | /* CWSDPMI's task base is always under the 1MB mark. */ | |
1907 | if (offset > 0xfffff) | |
1908 | return 0; | |
1909 | ||
1910 | _farsetsel (_dos_ds); | |
1911 | taskbase = _farnspeekl (offset) & 0xffffffU; | |
1912 | taskbase += _farnspeekl (offset + 2) & 0xff000000U; | |
1913 | if (taskbase > 0xfffff) | |
1914 | return 0; | |
1915 | ||
1916 | /* CR3 (a.k.a. PDBR, the Page Directory Base Register) is stored at | |
1917 | offset 1Ch in the TSS. */ | |
1918 | cr3 = _farnspeekl (taskbase + 0x1c) & ~0xfff; | |
1919 | if (cr3 > 0xfffff) | |
1920 | { | |
0963b4bd | 1921 | #if 0 /* Not fullly supported yet. */ |
9f20bf26 EZ |
1922 | /* The Page Directory is in UMBs. In that case, CWSDPMI puts |
1923 | the first Page Table right below the Page Directory. Thus, | |
1924 | the first Page Table's entry for its own address and the Page | |
1925 | Directory entry for that Page Table will hold the same | |
1926 | physical address. The loop below searches the entire UMB | |
1927 | range of addresses for such an occurence. */ | |
1928 | unsigned long addr, pte_idx; | |
1929 | ||
1930 | for (addr = 0xb0000, pte_idx = 0xb0; | |
1931 | pte_idx < 0xff; | |
1932 | addr += 0x1000, pte_idx++) | |
1933 | { | |
1934 | if (((_farnspeekl (addr + 4 * pte_idx) & 0xfffff027) == | |
1935 | (_farnspeekl (addr + 0x1000) & 0xfffff027)) | |
1936 | && ((_farnspeekl (addr + 4 * pte_idx + 4) & 0xfffff000) == cr3)) | |
1937 | { | |
1938 | cr3 = addr + 0x1000; | |
1939 | break; | |
1940 | } | |
1941 | } | |
a3b9cbb3 | 1942 | #endif |
9f20bf26 EZ |
1943 | |
1944 | if (cr3 > 0xfffff) | |
1945 | cr3 = 0; | |
1946 | } | |
1947 | ||
1948 | return cr3; | |
1949 | } | |
1950 | ||
1951 | /* Return the N'th Page Directory entry. */ | |
1952 | static unsigned long | |
1953 | get_pde (int n) | |
1954 | { | |
1955 | unsigned long pde = 0; | |
1956 | ||
1957 | if (pdbr && n >= 0 && n < 1024) | |
1958 | { | |
1959 | pde = _farpeekl (_dos_ds, pdbr + 4*n); | |
1960 | } | |
1961 | return pde; | |
1962 | } | |
1963 | ||
1964 | /* Return the N'th entry of the Page Table whose Page Directory entry | |
1965 | is PDE. */ | |
1966 | static unsigned long | |
1967 | get_pte (unsigned long pde, int n) | |
1968 | { | |
1969 | unsigned long pte = 0; | |
1970 | ||
1971 | /* pde & 0x80 tests the 4MB page bit. We don't support 4MB | |
1972 | page tables, for now. */ | |
1973 | if ((pde & 1) && !(pde & 0x80) && n >= 0 && n < 1024) | |
1974 | { | |
0963b4bd | 1975 | pde &= ~0xfff; /* Clear non-address bits. */ |
9f20bf26 EZ |
1976 | pte = _farpeekl (_dos_ds, pde + 4*n); |
1977 | } | |
1978 | return pte; | |
1979 | } | |
1980 | ||
1981 | /* Display a Page Directory or Page Table entry. IS_DIR, if non-zero, | |
1982 | says this is a Page Directory entry. If FORCE is non-zero, display | |
1983 | the entry even if its Present flag is off. OFF is the offset of the | |
1984 | address from the page's base address. */ | |
1985 | static void | |
1986 | display_ptable_entry (unsigned long entry, int is_dir, int force, unsigned off) | |
1987 | { | |
1988 | if ((entry & 1) != 0) | |
1989 | { | |
1990 | printf_filtered ("Base=0x%05lx000", entry >> 12); | |
1991 | if ((entry & 0x100) && !is_dir) | |
1992 | puts_filtered (" Global"); | |
1993 | if ((entry & 0x40) && !is_dir) | |
1994 | puts_filtered (" Dirty"); | |
1995 | printf_filtered (" %sAcc.", (entry & 0x20) ? "" : "Not-"); | |
1996 | printf_filtered (" %sCached", (entry & 0x10) ? "" : "Not-"); | |
1997 | printf_filtered (" Write-%s", (entry & 8) ? "Thru" : "Back"); | |
1998 | printf_filtered (" %s", (entry & 4) ? "Usr" : "Sup"); | |
1999 | printf_filtered (" Read-%s", (entry & 2) ? "Write" : "Only"); | |
2000 | if (off) | |
2001 | printf_filtered (" +0x%x", off); | |
2002 | puts_filtered ("\n"); | |
2003 | } | |
2004 | else if (force) | |
2005 | printf_filtered ("Page%s not present or not supported; value=0x%lx.\n", | |
2006 | is_dir ? " Table" : "", entry >> 1); | |
2007 | } | |
2008 | ||
2009 | static void | |
2010 | go32_pde (char *arg, int from_tty) | |
2011 | { | |
2012 | long pde_idx = -1, i; | |
2013 | ||
2014 | if (arg && *arg) | |
2015 | { | |
529480d0 | 2016 | arg = skip_spaces (arg); |
9f20bf26 EZ |
2017 | |
2018 | if (*arg) | |
2019 | { | |
2020 | pde_idx = parse_and_eval_long (arg); | |
2021 | if (pde_idx < 0 || pde_idx >= 1024) | |
8a3fe4f8 | 2022 | error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx); |
9f20bf26 EZ |
2023 | } |
2024 | } | |
2025 | ||
2026 | pdbr = get_cr3 (); | |
2027 | if (!pdbr) | |
0963b4bd MS |
2028 | puts_filtered ("Access to Page Directories is " |
2029 | "not supported on this system.\n"); | |
9f20bf26 EZ |
2030 | else if (pde_idx >= 0) |
2031 | display_ptable_entry (get_pde (pde_idx), 1, 1, 0); | |
2032 | else | |
2033 | for (i = 0; i < 1024; i++) | |
2034 | display_ptable_entry (get_pde (i), 1, 0, 0); | |
2035 | } | |
2036 | ||
2037 | /* A helper function to display entries in a Page Table pointed to by | |
2038 | the N'th entry in the Page Directory. If FORCE is non-zero, say | |
2039 | something even if the Page Table is not accessible. */ | |
2040 | static void | |
2041 | display_page_table (long n, int force) | |
2042 | { | |
2043 | unsigned long pde = get_pde (n); | |
2044 | ||
2045 | if ((pde & 1) != 0) | |
2046 | { | |
2047 | int i; | |
2048 | ||
0963b4bd MS |
2049 | printf_filtered ("Page Table pointed to by " |
2050 | "Page Directory entry 0x%lx:\n", n); | |
9f20bf26 EZ |
2051 | for (i = 0; i < 1024; i++) |
2052 | display_ptable_entry (get_pte (pde, i), 0, 0, 0); | |
2053 | puts_filtered ("\n"); | |
2054 | } | |
2055 | else if (force) | |
2056 | printf_filtered ("Page Table not present; value=0x%lx.\n", pde >> 1); | |
2057 | } | |
2058 | ||
2059 | static void | |
2060 | go32_pte (char *arg, int from_tty) | |
2061 | { | |
ccbc3e6f | 2062 | long pde_idx = -1L, i; |
9f20bf26 EZ |
2063 | |
2064 | if (arg && *arg) | |
2065 | { | |
529480d0 | 2066 | arg = skip_spaces (arg); |
9f20bf26 EZ |
2067 | |
2068 | if (*arg) | |
2069 | { | |
2070 | pde_idx = parse_and_eval_long (arg); | |
2071 | if (pde_idx < 0 || pde_idx >= 1024) | |
8a3fe4f8 | 2072 | error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx); |
9f20bf26 EZ |
2073 | } |
2074 | } | |
2075 | ||
2076 | pdbr = get_cr3 (); | |
2077 | if (!pdbr) | |
2078 | puts_filtered ("Access to Page Tables is not supported on this system.\n"); | |
2079 | else if (pde_idx >= 0) | |
2080 | display_page_table (pde_idx, 1); | |
2081 | else | |
2082 | for (i = 0; i < 1024; i++) | |
2083 | display_page_table (i, 0); | |
2084 | } | |
2085 | ||
2086 | static void | |
2087 | go32_pte_for_address (char *arg, int from_tty) | |
2088 | { | |
2089 | CORE_ADDR addr = 0, i; | |
2090 | ||
2091 | if (arg && *arg) | |
2092 | { | |
529480d0 | 2093 | arg = skip_spaces (arg); |
9f20bf26 EZ |
2094 | |
2095 | if (*arg) | |
2096 | addr = parse_and_eval_address (arg); | |
2097 | } | |
2098 | if (!addr) | |
e2e0b3e5 | 2099 | error_no_arg (_("linear address")); |
9f20bf26 EZ |
2100 | |
2101 | pdbr = get_cr3 (); | |
2102 | if (!pdbr) | |
2103 | puts_filtered ("Access to Page Tables is not supported on this system.\n"); | |
2104 | else | |
2105 | { | |
2106 | int pde_idx = (addr >> 22) & 0x3ff; | |
2107 | int pte_idx = (addr >> 12) & 0x3ff; | |
2108 | unsigned offs = addr & 0xfff; | |
2109 | ||
2244ba2e PM |
2110 | printf_filtered ("Page Table entry for address %s:\n", |
2111 | hex_string(addr)); | |
9f20bf26 EZ |
2112 | display_ptable_entry (get_pte (get_pde (pde_idx), pte_idx), 0, 1, offs); |
2113 | } | |
2114 | } | |
2115 | ||
d8c852a1 EZ |
2116 | static struct cmd_list_element *info_dos_cmdlist = NULL; |
2117 | ||
2118 | static void | |
2119 | go32_info_dos_command (char *args, int from_tty) | |
2120 | { | |
2121 | help_list (info_dos_cmdlist, "info dos ", class_info, gdb_stdout); | |
2122 | } | |
2123 | ||
70976b65 YQ |
2124 | /* -Wmissing-prototypes */ |
2125 | extern initialize_file_ftype _initialize_go32_nat; | |
2126 | ||
e49d4fa6 SS |
2127 | void |
2128 | _initialize_go32_nat (void) | |
2129 | { | |
2130 | init_go32_ops (); | |
2131 | add_target (&go32_ops); | |
10ba702d | 2132 | |
1bedd215 AC |
2133 | add_prefix_cmd ("dos", class_info, go32_info_dos_command, _("\ |
2134 | Print information specific to DJGPP (aka MS-DOS) debugging."), | |
d8c852a1 EZ |
2135 | &info_dos_cmdlist, "info dos ", 0, &infolist); |
2136 | ||
1a966eab AC |
2137 | add_cmd ("sysinfo", class_info, go32_sysinfo, _("\ |
2138 | Display information about the target system, including CPU, OS, DPMI, etc."), | |
d8c852a1 | 2139 | &info_dos_cmdlist); |
1a966eab AC |
2140 | add_cmd ("ldt", class_info, go32_sldt, _("\ |
2141 | Display entries in the LDT (Local Descriptor Table).\n\ | |
2142 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2143 | &info_dos_cmdlist); |
1a966eab AC |
2144 | add_cmd ("gdt", class_info, go32_sgdt, _("\ |
2145 | Display entries in the GDT (Global Descriptor Table).\n\ | |
2146 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2147 | &info_dos_cmdlist); |
1a966eab AC |
2148 | add_cmd ("idt", class_info, go32_sidt, _("\ |
2149 | Display entries in the IDT (Interrupt Descriptor Table).\n\ | |
2150 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2151 | &info_dos_cmdlist); |
1a966eab AC |
2152 | add_cmd ("pde", class_info, go32_pde, _("\ |
2153 | Display entries in the Page Directory.\n\ | |
2154 | Entry number (an expression) as an argument means display only that entry."), | |
9f20bf26 | 2155 | &info_dos_cmdlist); |
1a966eab AC |
2156 | add_cmd ("pte", class_info, go32_pte, _("\ |
2157 | Display entries in Page Tables.\n\ | |
2158 | Entry number (an expression) as an argument means display only entries\n\ | |
2159 | from the Page Table pointed to by the specified Page Directory entry."), | |
9f20bf26 | 2160 | &info_dos_cmdlist); |
1a966eab AC |
2161 | add_cmd ("address-pte", class_info, go32_pte_for_address, _("\ |
2162 | Display a Page Table entry for a linear address.\n\ | |
2163 | The address argument must be a linear address, after adding to\n\ | |
2164 | it the base address of the appropriate segment.\n\ | |
2165 | The base address of variables and functions in the debuggee's data\n\ | |
2166 | or code segment is stored in the variable __djgpp_base_address,\n\ | |
2167 | so use `__djgpp_base_address + (char *)&var' as the argument.\n\ | |
2168 | For other segments, look up their base address in the output of\n\ | |
2169 | the `info dos ldt' command."), | |
9f20bf26 | 2170 | &info_dos_cmdlist); |
e49d4fa6 | 2171 | } |
53a5351d JM |
2172 | |
2173 | pid_t | |
2174 | tcgetpgrp (int fd) | |
2175 | { | |
2176 | if (isatty (fd)) | |
2177 | return SOME_PID; | |
2178 | errno = ENOTTY; | |
2179 | return -1; | |
2180 | } | |
2181 | ||
2182 | int | |
2183 | tcsetpgrp (int fd, pid_t pgid) | |
2184 | { | |
2185 | if (isatty (fd) && pgid == SOME_PID) | |
2186 | return 0; | |
2187 | errno = pgid == SOME_PID ? ENOTTY : ENOSYS; | |
2188 | return -1; | |
2189 | } |