Commit | Line | Data |
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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" |
c1a7b7c6 | 105 | #include "inf-child.h" |
e49d4fa6 | 106 | |
10ba702d | 107 | #include <stdio.h> /* might be required for __DJGPP_MINOR__ */ |
e49d4fa6 | 108 | #include <stdlib.h> |
10ba702d | 109 | #include <ctype.h> |
53a5351d | 110 | #include <errno.h> |
c2c6d25f | 111 | #include <unistd.h> |
10ba702d | 112 | #include <sys/utsname.h> |
53a5351d | 113 | #include <io.h> |
10ba702d | 114 | #include <dos.h> |
53a5351d | 115 | #include <dpmi.h> |
10ba702d | 116 | #include <go32.h> |
9f20bf26 | 117 | #include <sys/farptr.h> |
e49d4fa6 SS |
118 | #include <debug/v2load.h> |
119 | #include <debug/dbgcom.h> | |
53a5351d JM |
120 | #if __DJGPP_MINOR__ > 2 |
121 | #include <debug/redir.h> | |
122 | #endif | |
e49d4fa6 | 123 | |
10085bb5 EZ |
124 | #include <langinfo.h> |
125 | ||
b83266a0 | 126 | #if __DJGPP_MINOR__ < 3 |
0963b4bd MS |
127 | /* This code will be provided from DJGPP 2.03 on. Until then I code it |
128 | here. */ | |
c5aa993b JM |
129 | typedef struct |
130 | { | |
131 | unsigned short sig0; | |
132 | unsigned short sig1; | |
133 | unsigned short sig2; | |
134 | unsigned short sig3; | |
135 | unsigned short exponent:15; | |
136 | unsigned short sign:1; | |
137 | } | |
138 | NPXREG; | |
139 | ||
140 | typedef struct | |
141 | { | |
142 | unsigned int control; | |
143 | unsigned int status; | |
144 | unsigned int tag; | |
145 | unsigned int eip; | |
146 | unsigned int cs; | |
147 | unsigned int dataptr; | |
148 | unsigned int datasel; | |
149 | NPXREG reg[8]; | |
150 | } | |
151 | NPX; | |
b83266a0 SS |
152 | |
153 | static NPX npx; | |
154 | ||
0963b4bd MS |
155 | static void save_npx (void); /* Save the FPU of the debugged program. */ |
156 | static void load_npx (void); /* Restore the FPU of the debugged program. */ | |
b83266a0 SS |
157 | |
158 | /* ------------------------------------------------------------------------- */ | |
159 | /* Store the contents of the NPX in the global variable `npx'. */ | |
c5aa993b | 160 | /* *INDENT-OFF* */ |
b83266a0 SS |
161 | |
162 | static void | |
163 | save_npx (void) | |
164 | { | |
1f5dc670 EZ |
165 | asm ("inb $0xa0, %%al \n\ |
166 | testb $0x20, %%al \n\ | |
167 | jz 1f \n\ | |
82cc5033 EZ |
168 | xorb %%al, %%al \n\ |
169 | outb %%al, $0xf0 \n\ | |
1f5dc670 | 170 | movb $0x20, %%al \n\ |
82cc5033 EZ |
171 | outb %%al, $0xa0 \n\ |
172 | outb %%al, $0x20 \n\ | |
1f5dc670 | 173 | 1: \n\ |
82cc5033 | 174 | fnsave %0 \n\ |
c5aa993b JM |
175 | fwait " |
176 | : "=m" (npx) | |
177 | : /* No input */ | |
178 | : "%eax"); | |
b83266a0 | 179 | } |
c5aa993b JM |
180 | |
181 | /* *INDENT-ON* */ | |
182 | ||
183 | ||
b83266a0 SS |
184 | /* ------------------------------------------------------------------------- */ |
185 | /* Reload the contents of the NPX from the global variable `npx'. */ | |
186 | ||
187 | static void | |
188 | load_npx (void) | |
189 | { | |
ba8629a9 | 190 | asm ("frstor %0":"=m" (npx)); |
b83266a0 | 191 | } |
53a5351d JM |
192 | /* ------------------------------------------------------------------------- */ |
193 | /* Stubs for the missing redirection functions. */ | |
194 | typedef struct { | |
195 | char *command; | |
196 | int redirected; | |
197 | } cmdline_t; | |
198 | ||
4d277981 | 199 | void |
ba8629a9 EZ |
200 | redir_cmdline_delete (cmdline_t *ptr) |
201 | { | |
202 | ptr->redirected = 0; | |
203 | } | |
4d277981 EZ |
204 | |
205 | int | |
206 | redir_cmdline_parse (const char *args, cmdline_t *ptr) | |
53a5351d JM |
207 | { |
208 | return -1; | |
209 | } | |
ba8629a9 | 210 | |
4d277981 EZ |
211 | int |
212 | redir_to_child (cmdline_t *ptr) | |
53a5351d JM |
213 | { |
214 | return 1; | |
215 | } | |
ba8629a9 | 216 | |
4d277981 EZ |
217 | int |
218 | redir_to_debugger (cmdline_t *ptr) | |
53a5351d JM |
219 | { |
220 | return 1; | |
221 | } | |
ba8629a9 | 222 | |
4d277981 | 223 | int |
ba8629a9 EZ |
224 | redir_debug_init (cmdline_t *ptr) |
225 | { | |
226 | return 0; | |
227 | } | |
b83266a0 SS |
228 | #endif /* __DJGPP_MINOR < 3 */ |
229 | ||
53a5351d JM |
230 | typedef enum { wp_insert, wp_remove, wp_count } wp_op; |
231 | ||
232 | /* This holds the current reference counts for each debug register. */ | |
233 | static int dr_ref_count[4]; | |
234 | ||
e49d4fa6 SS |
235 | #define SOME_PID 42 |
236 | ||
e49d4fa6 | 237 | static int prog_has_started = 0; |
136d6dae | 238 | static void go32_mourn_inferior (struct target_ops *ops); |
b83266a0 | 239 | |
53a5351d | 240 | #define r_ofs(x) (offsetof(TSS,x)) |
e49d4fa6 SS |
241 | |
242 | static struct | |
243 | { | |
53a5351d JM |
244 | size_t tss_ofs; |
245 | size_t size; | |
e49d4fa6 SS |
246 | } |
247 | regno_mapping[] = | |
248 | { | |
0fff5247 EZ |
249 | {r_ofs (tss_eax), 4}, /* normal registers, from a_tss */ |
250 | {r_ofs (tss_ecx), 4}, | |
251 | {r_ofs (tss_edx), 4}, | |
252 | {r_ofs (tss_ebx), 4}, | |
253 | {r_ofs (tss_esp), 4}, | |
254 | {r_ofs (tss_ebp), 4}, | |
255 | {r_ofs (tss_esi), 4}, | |
256 | {r_ofs (tss_edi), 4}, | |
257 | {r_ofs (tss_eip), 4}, | |
258 | {r_ofs (tss_eflags), 4}, | |
259 | {r_ofs (tss_cs), 2}, | |
260 | {r_ofs (tss_ss), 2}, | |
261 | {r_ofs (tss_ds), 2}, | |
262 | {r_ofs (tss_es), 2}, | |
263 | {r_ofs (tss_fs), 2}, | |
264 | {r_ofs (tss_gs), 2}, | |
265 | {0, 10}, /* 8 FP registers, from npx.reg[] */ | |
266 | {1, 10}, | |
267 | {2, 10}, | |
268 | {3, 10}, | |
269 | {4, 10}, | |
270 | {5, 10}, | |
271 | {6, 10}, | |
272 | {7, 10}, | |
53a5351d | 273 | /* The order of the next 7 registers must be consistent |
0fff5247 EZ |
274 | with their numbering in config/i386/tm-i386.h, which see. */ |
275 | {0, 2}, /* control word, from npx */ | |
276 | {4, 2}, /* status word, from npx */ | |
277 | {8, 2}, /* tag word, from npx */ | |
278 | {16, 2}, /* last FP exception CS from npx */ | |
279 | {12, 4}, /* last FP exception EIP from npx */ | |
280 | {24, 2}, /* last FP exception operand selector from npx */ | |
281 | {20, 4}, /* last FP exception operand offset from npx */ | |
282 | {18, 2} /* last FP opcode from npx */ | |
e49d4fa6 SS |
283 | }; |
284 | ||
285 | static struct | |
286 | { | |
287 | int go32_sig; | |
2ea28649 | 288 | enum gdb_signal gdb_sig; |
e49d4fa6 SS |
289 | } |
290 | sig_map[] = | |
291 | { | |
a493e3e2 PA |
292 | {0, GDB_SIGNAL_FPE}, |
293 | {1, GDB_SIGNAL_TRAP}, | |
53a5351d JM |
294 | /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL, |
295 | but I think SIGBUS is better, since the NMI is usually activated | |
296 | as a result of a memory parity check failure. */ | |
a493e3e2 PA |
297 | {2, GDB_SIGNAL_BUS}, |
298 | {3, GDB_SIGNAL_TRAP}, | |
299 | {4, GDB_SIGNAL_FPE}, | |
300 | {5, GDB_SIGNAL_SEGV}, | |
301 | {6, GDB_SIGNAL_ILL}, | |
302 | {7, GDB_SIGNAL_EMT}, /* no-coprocessor exception */ | |
303 | {8, GDB_SIGNAL_SEGV}, | |
304 | {9, GDB_SIGNAL_SEGV}, | |
305 | {10, GDB_SIGNAL_BUS}, | |
306 | {11, GDB_SIGNAL_SEGV}, | |
307 | {12, GDB_SIGNAL_SEGV}, | |
308 | {13, GDB_SIGNAL_SEGV}, | |
309 | {14, GDB_SIGNAL_SEGV}, | |
310 | {16, GDB_SIGNAL_FPE}, | |
311 | {17, GDB_SIGNAL_BUS}, | |
312 | {31, GDB_SIGNAL_ILL}, | |
313 | {0x1b, GDB_SIGNAL_INT}, | |
314 | {0x75, GDB_SIGNAL_FPE}, | |
315 | {0x78, GDB_SIGNAL_ALRM}, | |
316 | {0x79, GDB_SIGNAL_INT}, | |
317 | {0x7a, GDB_SIGNAL_QUIT}, | |
318 | {-1, GDB_SIGNAL_LAST} | |
e49d4fa6 SS |
319 | }; |
320 | ||
53a5351d | 321 | static struct { |
2ea28649 | 322 | enum gdb_signal gdb_sig; |
53a5351d JM |
323 | int djgpp_excepno; |
324 | } excepn_map[] = { | |
a493e3e2 PA |
325 | {GDB_SIGNAL_0, -1}, |
326 | {GDB_SIGNAL_ILL, 6}, /* Invalid Opcode */ | |
327 | {GDB_SIGNAL_EMT, 7}, /* triggers SIGNOFP */ | |
328 | {GDB_SIGNAL_SEGV, 13}, /* GPF */ | |
329 | {GDB_SIGNAL_BUS, 17}, /* Alignment Check */ | |
53a5351d JM |
330 | /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for |
331 | details. */ | |
a493e3e2 PA |
332 | {GDB_SIGNAL_TERM, 0x1b}, /* triggers Ctrl-Break type of SIGINT */ |
333 | {GDB_SIGNAL_FPE, 0x75}, | |
334 | {GDB_SIGNAL_INT, 0x79}, | |
335 | {GDB_SIGNAL_QUIT, 0x7a}, | |
336 | {GDB_SIGNAL_ALRM, 0x78}, /* triggers SIGTIMR */ | |
337 | {GDB_SIGNAL_PROF, 0x78}, | |
338 | {GDB_SIGNAL_LAST, -1} | |
53a5351d JM |
339 | }; |
340 | ||
e49d4fa6 | 341 | static void |
4d277981 | 342 | go32_open (char *name, int from_tty) |
e49d4fa6 | 343 | { |
53a5351d | 344 | printf_unfiltered ("Done. Use the \"run\" command to run the program.\n"); |
e49d4fa6 SS |
345 | } |
346 | ||
e49d4fa6 | 347 | static void |
136d6dae | 348 | go32_attach (struct target_ops *ops, char *args, int from_tty) |
e49d4fa6 | 349 | { |
8a3fe4f8 | 350 | error (_("\ |
53a5351d | 351 | You cannot attach to a running program on this platform.\n\ |
8a3fe4f8 | 352 | Use the `run' command to run DJGPP programs.")); |
e49d4fa6 SS |
353 | } |
354 | ||
e49d4fa6 | 355 | static int resume_is_step; |
53a5351d | 356 | static int resume_signal = -1; |
e49d4fa6 SS |
357 | |
358 | static void | |
28439f5e | 359 | go32_resume (struct target_ops *ops, |
2ea28649 | 360 | ptid_t ptid, int step, enum gdb_signal siggnal) |
c5aa993b | 361 | { |
53a5351d JM |
362 | int i; |
363 | ||
c5aa993b | 364 | resume_is_step = step; |
53a5351d | 365 | |
a493e3e2 | 366 | if (siggnal != GDB_SIGNAL_0 && siggnal != GDB_SIGNAL_TRAP) |
53a5351d | 367 | { |
0fff5247 | 368 | for (i = 0, resume_signal = -1; |
a493e3e2 | 369 | excepn_map[i].gdb_sig != GDB_SIGNAL_LAST; i++) |
53a5351d JM |
370 | if (excepn_map[i].gdb_sig == siggnal) |
371 | { | |
372 | resume_signal = excepn_map[i].djgpp_excepno; | |
373 | break; | |
374 | } | |
375 | if (resume_signal == -1) | |
376 | printf_unfiltered ("Cannot deliver signal %s on this platform.\n", | |
2ea28649 | 377 | gdb_signal_to_name (siggnal)); |
53a5351d | 378 | } |
c5aa993b | 379 | } |
e49d4fa6 | 380 | |
53a5351d JM |
381 | static char child_cwd[FILENAME_MAX]; |
382 | ||
31616044 | 383 | static ptid_t |
117de6a9 | 384 | go32_wait (struct target_ops *ops, |
47608cb1 | 385 | ptid_t ptid, struct target_waitstatus *status, int options) |
e49d4fa6 SS |
386 | { |
387 | int i; | |
53a5351d | 388 | unsigned char saved_opcode; |
0fff5247 | 389 | unsigned long INT3_addr = 0; |
53a5351d | 390 | int stepping_over_INT = 0; |
e49d4fa6 | 391 | |
0963b4bd | 392 | a_tss.tss_eflags &= 0xfeff; /* Reset the single-step flag (TF). */ |
e49d4fa6 | 393 | if (resume_is_step) |
53a5351d JM |
394 | { |
395 | /* If the next instruction is INT xx or INTO, we need to handle | |
396 | them specially. Intel manuals say that these instructions | |
397 | reset the single-step flag (a.k.a. TF). However, it seems | |
398 | that, at least in the DPMI environment, and at least when | |
399 | stepping over the DPMI interrupt 31h, the problem is having | |
400 | TF set at all when INT 31h is executed: the debuggee either | |
401 | crashes (and takes the system with it) or is killed by a | |
402 | SIGTRAP. | |
403 | ||
404 | So we need to emulate single-step mode: we put an INT3 opcode | |
405 | right after the INT xx instruction, let the debuggee run | |
406 | until it hits INT3 and stops, then restore the original | |
407 | instruction which we overwrote with the INT3 opcode, and back | |
408 | up the debuggee's EIP to that instruction. */ | |
409 | read_child (a_tss.tss_eip, &saved_opcode, 1); | |
410 | if (saved_opcode == 0xCD || saved_opcode == 0xCE) | |
411 | { | |
412 | unsigned char INT3_opcode = 0xCC; | |
413 | ||
414 | INT3_addr | |
415 | = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1; | |
416 | stepping_over_INT = 1; | |
417 | read_child (INT3_addr, &saved_opcode, 1); | |
418 | write_child (INT3_addr, &INT3_opcode, 1); | |
419 | } | |
420 | else | |
421 | a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */ | |
422 | } | |
423 | ||
424 | /* The special value FFFFh in tss_trap indicates to run_child that | |
425 | tss_irqn holds a signal to be delivered to the debuggee. */ | |
426 | if (resume_signal <= -1) | |
427 | { | |
428 | a_tss.tss_trap = 0; | |
429 | a_tss.tss_irqn = 0xff; | |
430 | } | |
e49d4fa6 | 431 | else |
53a5351d | 432 | { |
0963b4bd | 433 | a_tss.tss_trap = 0xffff; /* run_child looks for this. */ |
53a5351d JM |
434 | a_tss.tss_irqn = resume_signal; |
435 | } | |
436 | ||
437 | /* The child might change working directory behind our back. The | |
438 | GDB users won't like the side effects of that when they work with | |
439 | relative file names, and GDB might be confused by its current | |
440 | directory not being in sync with the truth. So we always make a | |
441 | point of changing back to where GDB thinks is its cwd, when we | |
442 | return control to the debugger, but restore child's cwd before we | |
443 | run it. */ | |
3a45aed8 EZ |
444 | /* Initialize child_cwd, before the first call to run_child and not |
445 | in the initialization, so the child get also the changed directory | |
0963b4bd | 446 | set with the gdb-command "cd ..." */ |
3a45aed8 EZ |
447 | if (!*child_cwd) |
448 | /* Initialize child's cwd with the current one. */ | |
449 | getcwd (child_cwd, sizeof (child_cwd)); | |
4d277981 | 450 | |
53a5351d | 451 | chdir (child_cwd); |
e49d4fa6 | 452 | |
b83266a0 | 453 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 454 | load_npx (); |
b83266a0 | 455 | #endif |
e49d4fa6 | 456 | run_child (); |
b83266a0 | 457 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 458 | save_npx (); |
b83266a0 | 459 | #endif |
e49d4fa6 | 460 | |
53a5351d JM |
461 | /* Did we step over an INT xx instruction? */ |
462 | if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1) | |
463 | { | |
464 | /* Restore the original opcode. */ | |
0963b4bd | 465 | a_tss.tss_eip--; /* EIP points *after* the INT3 instruction. */ |
53a5351d JM |
466 | write_child (a_tss.tss_eip, &saved_opcode, 1); |
467 | /* Simulate a TRAP exception. */ | |
468 | a_tss.tss_irqn = 1; | |
469 | a_tss.tss_eflags |= 0x0100; | |
470 | } | |
471 | ||
472 | getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */ | |
473 | chdir (current_directory); | |
474 | ||
e49d4fa6 SS |
475 | if (a_tss.tss_irqn == 0x21) |
476 | { | |
477 | status->kind = TARGET_WAITKIND_EXITED; | |
478 | status->value.integer = a_tss.tss_eax & 0xff; | |
479 | } | |
480 | else | |
481 | { | |
a493e3e2 | 482 | status->value.sig = GDB_SIGNAL_UNKNOWN; |
e49d4fa6 SS |
483 | status->kind = TARGET_WAITKIND_STOPPED; |
484 | for (i = 0; sig_map[i].go32_sig != -1; i++) | |
485 | { | |
486 | if (a_tss.tss_irqn == sig_map[i].go32_sig) | |
487 | { | |
53a5351d | 488 | #if __DJGPP_MINOR__ < 3 |
e49d4fa6 | 489 | if ((status->value.sig = sig_map[i].gdb_sig) != |
a493e3e2 | 490 | GDB_SIGNAL_TRAP) |
e49d4fa6 | 491 | status->kind = TARGET_WAITKIND_SIGNALLED; |
53a5351d JM |
492 | #else |
493 | status->value.sig = sig_map[i].gdb_sig; | |
494 | #endif | |
e49d4fa6 SS |
495 | break; |
496 | } | |
497 | } | |
498 | } | |
31616044 | 499 | return pid_to_ptid (SOME_PID); |
e49d4fa6 SS |
500 | } |
501 | ||
502 | static void | |
56be3814 | 503 | fetch_register (struct regcache *regcache, int regno) |
e49d4fa6 | 504 | { |
9d0b3624 PA |
505 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
506 | if (regno < gdbarch_fp0_regnum (gdbarch)) | |
56be3814 | 507 | regcache_raw_supply (regcache, regno, |
23a6d369 | 508 | (char *) &a_tss + regno_mapping[regno].tss_ofs); |
0963b4bd MS |
509 | else if (i386_fp_regnum_p (gdbarch, regno) || i386_fpc_regnum_p (gdbarch, |
510 | regno)) | |
56be3814 | 511 | i387_supply_fsave (regcache, regno, &npx); |
89dea5aa EZ |
512 | else |
513 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 514 | _("Invalid register no. %d in fetch_register."), regno); |
89dea5aa | 515 | } |
e49d4fa6 | 516 | |
89dea5aa | 517 | static void |
28439f5e PA |
518 | go32_fetch_registers (struct target_ops *ops, |
519 | struct regcache *regcache, int regno) | |
89dea5aa EZ |
520 | { |
521 | if (regno >= 0) | |
56be3814 | 522 | fetch_register (regcache, regno); |
89dea5aa | 523 | else |
e49d4fa6 | 524 | { |
7067c689 UW |
525 | for (regno = 0; |
526 | regno < gdbarch_fp0_regnum (get_regcache_arch (regcache)); | |
527 | regno++) | |
56be3814 UW |
528 | fetch_register (regcache, regno); |
529 | i387_supply_fsave (regcache, -1, &npx); | |
e49d4fa6 SS |
530 | } |
531 | } | |
532 | ||
533 | static void | |
56be3814 | 534 | store_register (const struct regcache *regcache, int regno) |
e49d4fa6 | 535 | { |
9d0b3624 PA |
536 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
537 | if (regno < gdbarch_fp0_regnum (gdbarch)) | |
56be3814 | 538 | regcache_raw_collect (regcache, regno, |
822c9732 | 539 | (char *) &a_tss + regno_mapping[regno].tss_ofs); |
0963b4bd MS |
540 | else if (i386_fp_regnum_p (gdbarch, regno) || i386_fpc_regnum_p (gdbarch, |
541 | regno)) | |
56be3814 | 542 | i387_collect_fsave (regcache, regno, &npx); |
e49d4fa6 | 543 | else |
8e65ff28 | 544 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 545 | _("Invalid register no. %d in store_register."), regno); |
e49d4fa6 SS |
546 | } |
547 | ||
548 | static void | |
28439f5e PA |
549 | go32_store_registers (struct target_ops *ops, |
550 | struct regcache *regcache, int regno) | |
e49d4fa6 | 551 | { |
0fff5247 | 552 | unsigned r; |
e49d4fa6 SS |
553 | |
554 | if (regno >= 0) | |
56be3814 | 555 | store_register (regcache, regno); |
e49d4fa6 SS |
556 | else |
557 | { | |
7067c689 | 558 | for (r = 0; r < gdbarch_fp0_regnum (get_regcache_arch (regcache)); r++) |
56be3814 UW |
559 | store_register (regcache, r); |
560 | i387_collect_fsave (regcache, -1, &npx); | |
e49d4fa6 SS |
561 | } |
562 | } | |
563 | ||
bd265cd0 PA |
564 | /* Const-correct version of DJGPP's write_child, which unfortunately |
565 | takes a non-const buffer pointer. */ | |
566 | ||
e49d4fa6 | 567 | static int |
bd265cd0 | 568 | my_write_child (unsigned child_addr, const void *buf, unsigned len) |
e49d4fa6 | 569 | { |
bd265cd0 PA |
570 | static void *buffer = NULL; |
571 | static unsigned buffer_len = 0; | |
572 | int res; | |
573 | ||
574 | if (buffer_len < len) | |
e49d4fa6 | 575 | { |
bd265cd0 PA |
576 | buffer = xrealloc (buffer, len); |
577 | buffer_len = len; | |
e49d4fa6 | 578 | } |
bd265cd0 PA |
579 | |
580 | memcpy (buffer, buf, len); | |
581 | res = write_child (child_addr, buffer, len); | |
582 | return res; | |
583 | } | |
584 | ||
585 | /* Helper for go32_xfer_partial that handles memory transfers. | |
586 | Arguments are like target_xfer_partial. */ | |
587 | ||
588 | static enum target_xfer_status | |
589 | go32_xfer_memory (gdb_byte *readbuf, const gdb_byte *writebuf, | |
590 | ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len) | |
591 | { | |
592 | int res; | |
593 | ||
594 | if (writebuf != NULL) | |
595 | res = my_write_child (memaddr, writebuf, len); | |
e49d4fa6 | 596 | else |
bd265cd0 PA |
597 | res = read_child (memaddr, readbuf, len); |
598 | ||
599 | if (res <= 0) | |
600 | return TARGET_XFER_E_IO; | |
601 | ||
602 | *xfered_len = res; | |
603 | return TARGET_XFER_OK; | |
604 | } | |
605 | ||
606 | /* Target to_xfer_partial implementation. */ | |
607 | ||
608 | static enum target_xfer_status | |
609 | go32_xfer_partial (struct target_ops *ops, enum target_object object, | |
610 | const char *annex, gdb_byte *readbuf, | |
611 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, | |
612 | ULONGEST *xfered_len) | |
613 | { | |
614 | switch (object) | |
e49d4fa6 | 615 | { |
bd265cd0 PA |
616 | case TARGET_OBJECT_MEMORY: |
617 | return go32_xfer_memory (readbuf, writebuf, offset, len, xfered_len); | |
618 | ||
619 | default: | |
620 | return ops->beneath->to_xfer_partial (ops->beneath, object, annex, | |
621 | readbuf, writebuf, offset, len, | |
622 | xfered_len); | |
e49d4fa6 SS |
623 | } |
624 | } | |
625 | ||
0963b4bd | 626 | static cmdline_t child_cmd; /* Parsed child's command line kept here. */ |
53a5351d | 627 | |
e49d4fa6 | 628 | static void |
4d277981 | 629 | go32_files_info (struct target_ops *target) |
e49d4fa6 | 630 | { |
53a5351d | 631 | printf_unfiltered ("You are running a DJGPP V2 program.\n"); |
e49d4fa6 SS |
632 | } |
633 | ||
e49d4fa6 | 634 | static void |
7d85a9c0 | 635 | go32_kill_inferior (struct target_ops *ops) |
e49d4fa6 | 636 | { |
67ce33d7 | 637 | go32_mourn_inferior (ops); |
e49d4fa6 SS |
638 | } |
639 | ||
640 | static void | |
267fbcde JB |
641 | go32_create_inferior (struct target_ops *ops, char *exec_file, |
642 | char *args, char **env, int from_tty) | |
e49d4fa6 | 643 | { |
4d277981 | 644 | extern char **environ; |
e49d4fa6 SS |
645 | jmp_buf start_state; |
646 | char *cmdline; | |
647 | char **env_save = environ; | |
150985e3 | 648 | size_t cmdlen; |
6c95b8df | 649 | struct inferior *inf; |
e49d4fa6 | 650 | |
0fff5247 EZ |
651 | /* If no exec file handed to us, get it from the exec-file command -- with |
652 | a good, common error message if none is specified. */ | |
653 | if (exec_file == 0) | |
654 | exec_file = get_exec_file (1); | |
655 | ||
53a5351d JM |
656 | resume_signal = -1; |
657 | resume_is_step = 0; | |
3a45aed8 EZ |
658 | |
659 | /* Initialize child's cwd as empty to be initialized when starting | |
660 | the child. */ | |
661 | *child_cwd = 0; | |
662 | ||
53a5351d JM |
663 | /* Init command line storage. */ |
664 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 | 665 | internal_error (__FILE__, __LINE__, |
0963b4bd MS |
666 | _("Cannot allocate redirection storage: " |
667 | "not enough memory.\n")); | |
53a5351d JM |
668 | |
669 | /* Parse the command line and create redirections. */ | |
670 | if (strpbrk (args, "<>")) | |
671 | { | |
672 | if (redir_cmdline_parse (args, &child_cmd) == 0) | |
673 | args = child_cmd.command; | |
674 | else | |
8a3fe4f8 | 675 | error (_("Syntax error in command line.")); |
53a5351d JM |
676 | } |
677 | else | |
c2d11a7d | 678 | child_cmd.command = xstrdup (args); |
e49d4fa6 | 679 | |
150985e3 EZ |
680 | cmdlen = strlen (args); |
681 | /* v2loadimage passes command lines via DOS memory, so it cannot | |
682 | possibly handle commands longer than 1MB. */ | |
683 | if (cmdlen > 1024*1024) | |
8a3fe4f8 | 684 | error (_("Command line too long.")); |
150985e3 EZ |
685 | |
686 | cmdline = xmalloc (cmdlen + 4); | |
e49d4fa6 | 687 | strcpy (cmdline + 1, args); |
150985e3 EZ |
688 | /* If the command-line length fits into DOS 126-char limits, use the |
689 | DOS command tail format; otherwise, tell v2loadimage to pass it | |
690 | through a buffer in conventional memory. */ | |
691 | if (cmdlen < 127) | |
692 | { | |
693 | cmdline[0] = strlen (args); | |
694 | cmdline[cmdlen + 1] = 13; | |
695 | } | |
696 | else | |
0963b4bd | 697 | cmdline[0] = 0xff; /* Signal v2loadimage it's a long command. */ |
e49d4fa6 SS |
698 | |
699 | environ = env; | |
700 | ||
701 | if (v2loadimage (exec_file, cmdline, start_state)) | |
702 | { | |
703 | environ = env_save; | |
704 | printf_unfiltered ("Load failed for image %s\n", exec_file); | |
705 | exit (1); | |
706 | } | |
707 | environ = env_save; | |
12a498f3 | 708 | xfree (cmdline); |
e49d4fa6 SS |
709 | |
710 | edi_init (start_state); | |
53a5351d JM |
711 | #if __DJGPP_MINOR__ < 3 |
712 | save_npx (); | |
713 | #endif | |
e49d4fa6 | 714 | |
39f77062 | 715 | inferior_ptid = pid_to_ptid (SOME_PID); |
6c95b8df | 716 | inf = current_inferior (); |
20176d8f | 717 | inferior_appeared (inf, SOME_PID); |
7f9f62ba | 718 | |
c1a7b7c6 | 719 | push_target (ops); |
444c3224 PA |
720 | |
721 | add_thread_silent (inferior_ptid); | |
722 | ||
e49d4fa6 SS |
723 | clear_proceed_status (); |
724 | insert_breakpoints (); | |
b83266a0 | 725 | prog_has_started = 1; |
e49d4fa6 SS |
726 | } |
727 | ||
728 | static void | |
136d6dae | 729 | go32_mourn_inferior (struct target_ops *ops) |
e49d4fa6 | 730 | { |
67ce33d7 PA |
731 | ptid_t ptid; |
732 | ||
733 | redir_cmdline_delete (&child_cmd); | |
734 | resume_signal = -1; | |
735 | resume_is_step = 0; | |
736 | ||
737 | cleanup_client (); | |
738 | ||
53a5351d JM |
739 | /* We need to make sure all the breakpoint enable bits in the DR7 |
740 | register are reset when the inferior exits. Otherwise, if they | |
741 | rerun the inferior, the uncleared bits may cause random SIGTRAPs, | |
742 | failure to set more watchpoints, and other calamities. It would | |
743 | be nice if GDB itself would take care to remove all breakpoints | |
744 | at all times, but it doesn't, probably under an assumption that | |
745 | the OS cleans up when the debuggee exits. */ | |
e24d4c64 | 746 | i386_cleanup_dregs (); |
67ce33d7 PA |
747 | |
748 | ptid = inferior_ptid; | |
749 | inferior_ptid = null_ptid; | |
750 | delete_thread_silent (ptid); | |
751 | prog_has_started = 0; | |
752 | ||
753 | unpush_target (ops); | |
e49d4fa6 SS |
754 | generic_mourn_inferior (); |
755 | } | |
756 | ||
e49d4fa6 SS |
757 | /* Hardware watchpoint support. */ |
758 | ||
e49d4fa6 | 759 | #define D_REGS edi.dr |
e24d4c64 EZ |
760 | #define CONTROL D_REGS[7] |
761 | #define STATUS D_REGS[6] | |
53a5351d | 762 | |
e24d4c64 EZ |
763 | /* Pass the address ADDR to the inferior in the I'th debug register. |
764 | Here we just store the address in D_REGS, the watchpoint will be | |
765 | actually set up when go32_wait runs the debuggee. */ | |
9bb9e8ad | 766 | static void |
e24d4c64 | 767 | go32_set_dr (int i, CORE_ADDR addr) |
e49d4fa6 | 768 | { |
4d277981 EZ |
769 | if (i < 0 || i > 3) |
770 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 771 | _("Invalid register %d in go32_set_dr.\n"), i); |
e24d4c64 | 772 | D_REGS[i] = addr; |
e49d4fa6 SS |
773 | } |
774 | ||
e24d4c64 EZ |
775 | /* Pass the value VAL to the inferior in the DR7 debug control |
776 | register. Here we just store the address in D_REGS, the watchpoint | |
777 | will be actually set up when go32_wait runs the debuggee. */ | |
9bb9e8ad PM |
778 | static void |
779 | go32_set_dr7 (unsigned long val) | |
53a5351d | 780 | { |
e24d4c64 | 781 | CONTROL = val; |
53a5351d JM |
782 | } |
783 | ||
e24d4c64 EZ |
784 | /* Get the value of the DR6 debug status register from the inferior. |
785 | Here we just return the value stored in D_REGS, as we've got it | |
786 | from the last go32_wait call. */ | |
9bb9e8ad | 787 | static unsigned long |
e24d4c64 | 788 | go32_get_dr6 (void) |
e49d4fa6 | 789 | { |
e24d4c64 | 790 | return STATUS; |
e49d4fa6 SS |
791 | } |
792 | ||
7b50312a PA |
793 | /* Get the value of the DR7 debug status register from the inferior. |
794 | Here we just return the value stored in D_REGS, as we've got it | |
795 | from the last go32_wait call. */ | |
796 | ||
797 | static unsigned long | |
798 | go32_get_dr7 (void) | |
799 | { | |
800 | return CONTROL; | |
801 | } | |
802 | ||
803 | /* Get the value of the DR debug register I from the inferior. Here | |
804 | we just return the value stored in D_REGS, as we've got it from the | |
805 | last go32_wait call. */ | |
806 | ||
807 | static CORE_ADDR | |
808 | go32_get_dr (int i) | |
809 | { | |
810 | if (i < 0 || i > 3) | |
811 | internal_error (__FILE__, __LINE__, | |
812 | _("Invalid register %d in go32_get_dr.\n"), i); | |
813 | return D_REGS[i]; | |
814 | } | |
815 | ||
53a5351d JM |
816 | /* Put the device open on handle FD into either raw or cooked |
817 | mode, return 1 if it was in raw mode, zero otherwise. */ | |
818 | ||
819 | static int | |
820 | device_mode (int fd, int raw_p) | |
821 | { | |
822 | int oldmode, newmode; | |
823 | __dpmi_regs regs; | |
824 | ||
825 | regs.x.ax = 0x4400; | |
826 | regs.x.bx = fd; | |
827 | __dpmi_int (0x21, ®s); | |
828 | if (regs.x.flags & 1) | |
829 | return -1; | |
830 | newmode = oldmode = regs.x.dx; | |
831 | ||
832 | if (raw_p) | |
833 | newmode |= 0x20; | |
834 | else | |
835 | newmode &= ~0x20; | |
836 | ||
0963b4bd | 837 | if (oldmode & 0x80) /* Only for character dev. */ |
53a5351d JM |
838 | { |
839 | regs.x.ax = 0x4401; | |
840 | regs.x.bx = fd; | |
0963b4bd | 841 | regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails. */ |
53a5351d JM |
842 | __dpmi_int (0x21, ®s); |
843 | if (regs.x.flags & 1) | |
844 | return -1; | |
845 | } | |
846 | return (oldmode & 0x20) == 0x20; | |
847 | } | |
848 | ||
849 | ||
850 | static int inf_mode_valid = 0; | |
851 | static int inf_terminal_mode; | |
852 | ||
853 | /* This semaphore is needed because, amazingly enough, GDB calls | |
854 | target.to_terminal_ours more than once after the inferior stops. | |
855 | But we need the information from the first call only, since the | |
856 | second call will always see GDB's own cooked terminal. */ | |
857 | static int terminal_is_ours = 1; | |
858 | ||
cce74817 | 859 | static void |
c42bf286 | 860 | go32_terminal_init (struct target_ops *self) |
cce74817 | 861 | { |
0963b4bd | 862 | inf_mode_valid = 0; /* Reinitialize, in case they are restarting child. */ |
53a5351d | 863 | terminal_is_ours = 1; |
cce74817 JM |
864 | } |
865 | ||
866 | static void | |
0a4f40a2 | 867 | go32_terminal_info (struct target_ops *self, const char *args, int from_tty) |
cce74817 | 868 | { |
53a5351d JM |
869 | printf_unfiltered ("Inferior's terminal is in %s mode.\n", |
870 | !inf_mode_valid | |
871 | ? "default" : inf_terminal_mode ? "raw" : "cooked"); | |
872 | ||
873 | #if __DJGPP_MINOR__ > 2 | |
874 | if (child_cmd.redirection) | |
875 | { | |
876 | int i; | |
877 | ||
878 | for (i = 0; i < DBG_HANDLES; i++) | |
c5aa993b | 879 | { |
53a5351d JM |
880 | if (child_cmd.redirection[i]->file_name) |
881 | printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n", | |
882 | i, child_cmd.redirection[i]->file_name); | |
883 | else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1) | |
884 | printf_unfiltered | |
885 | ("\tFile handle %d appears to be closed by inferior.\n", i); | |
886 | /* Mask off the raw/cooked bit when comparing device info words. */ | |
887 | else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf) | |
888 | != (_get_dev_info (i) & 0xdf)) | |
889 | printf_unfiltered | |
890 | ("\tFile handle %d appears to be redirected by inferior.\n", i); | |
c5aa993b | 891 | } |
53a5351d JM |
892 | } |
893 | #endif | |
894 | } | |
895 | ||
896 | static void | |
d2f640d4 | 897 | go32_terminal_inferior (struct target_ops *self) |
53a5351d JM |
898 | { |
899 | /* Redirect standard handles as child wants them. */ | |
900 | errno = 0; | |
901 | if (redir_to_child (&child_cmd) == -1) | |
902 | { | |
903 | redir_to_debugger (&child_cmd); | |
8a3fe4f8 | 904 | error (_("Cannot redirect standard handles for program: %s."), |
dc672865 | 905 | safe_strerror (errno)); |
53a5351d | 906 | } |
0963b4bd MS |
907 | /* Set the console device of the inferior to whatever mode |
908 | (raw or cooked) we found it last time. */ | |
53a5351d JM |
909 | if (terminal_is_ours) |
910 | { | |
911 | if (inf_mode_valid) | |
912 | device_mode (0, inf_terminal_mode); | |
913 | terminal_is_ours = 0; | |
914 | } | |
cce74817 JM |
915 | } |
916 | ||
917 | static void | |
e3594fd1 | 918 | go32_terminal_ours (struct target_ops *self) |
cce74817 | 919 | { |
53a5351d | 920 | /* Switch to cooked mode on the gdb terminal and save the inferior |
0963b4bd | 921 | terminal mode to be restored when it is resumed. */ |
53a5351d JM |
922 | if (!terminal_is_ours) |
923 | { | |
924 | inf_terminal_mode = device_mode (0, 0); | |
925 | if (inf_terminal_mode != -1) | |
926 | inf_mode_valid = 1; | |
927 | else | |
928 | /* If device_mode returned -1, we don't know what happens with | |
929 | handle 0 anymore, so make the info invalid. */ | |
930 | inf_mode_valid = 0; | |
931 | terminal_is_ours = 1; | |
932 | ||
933 | /* Restore debugger's standard handles. */ | |
934 | errno = 0; | |
935 | if (redir_to_debugger (&child_cmd) == -1) | |
936 | { | |
937 | redir_to_child (&child_cmd); | |
8a3fe4f8 | 938 | error (_("Cannot redirect standard handles for debugger: %s."), |
dc672865 | 939 | safe_strerror (errno)); |
53a5351d JM |
940 | } |
941 | } | |
cce74817 JM |
942 | } |
943 | ||
444c3224 | 944 | static int |
28439f5e | 945 | go32_thread_alive (struct target_ops *ops, ptid_t ptid) |
444c3224 | 946 | { |
89c9c2ec | 947 | return !ptid_equal (inferior_ptid, null_ptid); |
444c3224 PA |
948 | } |
949 | ||
950 | static char * | |
117de6a9 | 951 | go32_pid_to_str (struct target_ops *ops, ptid_t ptid) |
444c3224 | 952 | { |
89c9c2ec | 953 | return normal_pid_to_str (ptid); |
444c3224 PA |
954 | } |
955 | ||
c1a7b7c6 | 956 | /* Create a go32 target. */ |
0fff5247 | 957 | |
c1a7b7c6 PA |
958 | static struct target_ops * |
959 | go32_target (void) | |
960 | { | |
961 | struct target_ops *t = inf_child_target (); | |
962 | ||
963 | t->to_shortname = "djgpp"; | |
964 | t->to_longname = "djgpp target process"; | |
965 | t->to_doc | |
966 | = "Program loaded by djgpp, when gdb is used as an external debugger"; | |
967 | t->to_open = go32_open; | |
968 | t->to_attach = go32_attach; | |
969 | t->to_resume = go32_resume; | |
970 | t->to_wait = go32_wait; | |
971 | t->to_fetch_registers = go32_fetch_registers; | |
972 | t->to_store_registers = go32_store_registers; | |
973 | t->to_xfer_partial = go32_xfer_partial; | |
974 | t->to_files_info = go32_files_info; | |
975 | t->to_terminal_init = go32_terminal_init; | |
976 | t->to_terminal_inferior = go32_terminal_inferior; | |
977 | t->to_terminal_ours_for_output = go32_terminal_ours; | |
978 | t->to_terminal_ours = go32_terminal_ours; | |
979 | t->to_terminal_info = go32_terminal_info; | |
980 | t->to_kill = go32_kill_inferior; | |
981 | t->to_create_inferior = go32_create_inferior; | |
982 | t->to_mourn_inferior = go32_mourn_inferior; | |
983 | t->to_thread_alive = go32_thread_alive; | |
984 | t->to_pid_to_str = go32_pid_to_str; | |
985 | ||
986 | return t; | |
e49d4fa6 SS |
987 | } |
988 | ||
10085bb5 EZ |
989 | /* Return the current DOS codepage number. */ |
990 | static int | |
991 | dos_codepage (void) | |
992 | { | |
993 | __dpmi_regs regs; | |
994 | ||
995 | regs.x.ax = 0x6601; | |
996 | __dpmi_int (0x21, ®s); | |
997 | if (!(regs.x.flags & 1)) | |
998 | return regs.x.bx & 0xffff; | |
999 | else | |
1000 | return 437; /* default */ | |
1001 | } | |
1002 | ||
1003 | /* Limited emulation of `nl_langinfo', for charset.c. */ | |
1004 | char * | |
1005 | nl_langinfo (nl_item item) | |
1006 | { | |
1007 | char *retval; | |
1008 | ||
1009 | switch (item) | |
1010 | { | |
1011 | case CODESET: | |
1012 | { | |
1013 | /* 8 is enough for SHORT_MAX + "CP" + null. */ | |
1014 | char buf[8]; | |
1015 | int blen = sizeof (buf); | |
1016 | int needed = snprintf (buf, blen, "CP%d", dos_codepage ()); | |
1017 | ||
0963b4bd | 1018 | if (needed > blen) /* Should never happen. */ |
10085bb5 EZ |
1019 | buf[0] = 0; |
1020 | retval = xstrdup (buf); | |
1021 | } | |
1022 | break; | |
1023 | default: | |
1024 | retval = xstrdup (""); | |
1025 | break; | |
1026 | } | |
1027 | return retval; | |
1028 | } | |
1029 | ||
10ba702d EZ |
1030 | unsigned short windows_major, windows_minor; |
1031 | ||
1032 | /* Compute the version Windows reports via Int 2Fh/AX=1600h. */ | |
1033 | static void | |
1034 | go32_get_windows_version(void) | |
1035 | { | |
1036 | __dpmi_regs r; | |
1037 | ||
1038 | r.x.ax = 0x1600; | |
1039 | __dpmi_int(0x2f, &r); | |
1040 | if (r.h.al > 2 && r.h.al != 0x80 && r.h.al != 0xff | |
1041 | && (r.h.al > 3 || r.h.ah > 0)) | |
1042 | { | |
1043 | windows_major = r.h.al; | |
1044 | windows_minor = r.h.ah; | |
1045 | } | |
1046 | else | |
1047 | windows_major = 0xff; /* meaning no Windows */ | |
1048 | } | |
1049 | ||
1050 | /* A subroutine of go32_sysinfo to display memory info. */ | |
1051 | static void | |
1052 | print_mem (unsigned long datum, const char *header, int in_pages_p) | |
1053 | { | |
1054 | if (datum != 0xffffffffUL) | |
1055 | { | |
1056 | if (in_pages_p) | |
1057 | datum <<= 12; | |
1058 | puts_filtered (header); | |
1059 | if (datum > 1024) | |
1060 | { | |
1061 | printf_filtered ("%lu KB", datum >> 10); | |
1062 | if (datum > 1024 * 1024) | |
1063 | printf_filtered (" (%lu MB)", datum >> 20); | |
1064 | } | |
1065 | else | |
1066 | printf_filtered ("%lu Bytes", datum); | |
1067 | puts_filtered ("\n"); | |
1068 | } | |
1069 | } | |
1070 | ||
1071 | /* Display assorted information about the underlying OS. */ | |
1072 | static void | |
1073 | go32_sysinfo (char *arg, int from_tty) | |
1074 | { | |
d647eed6 EZ |
1075 | static const char test_pattern[] = |
1076 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf" | |
1077 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf" | |
1078 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeafdeadbeaf"; | |
10ba702d EZ |
1079 | struct utsname u; |
1080 | char cpuid_vendor[13]; | |
1081 | unsigned cpuid_max = 0, cpuid_eax, cpuid_ebx, cpuid_ecx, cpuid_edx; | |
1082 | unsigned true_dos_version = _get_dos_version (1); | |
1083 | unsigned advertized_dos_version = ((unsigned int)_osmajor << 8) | _osminor; | |
1084 | int dpmi_flags; | |
1085 | char dpmi_vendor_info[129]; | |
d647eed6 | 1086 | int dpmi_vendor_available; |
10ba702d EZ |
1087 | __dpmi_version_ret dpmi_version_data; |
1088 | long eflags; | |
1089 | __dpmi_free_mem_info mem_info; | |
1090 | __dpmi_regs regs; | |
1091 | ||
1092 | cpuid_vendor[0] = '\0'; | |
1093 | if (uname (&u)) | |
1094 | strcpy (u.machine, "Unknown x86"); | |
1095 | else if (u.machine[0] == 'i' && u.machine[1] > 4) | |
1096 | { | |
1097 | /* CPUID with EAX = 0 returns the Vendor ID. */ | |
4d157a3d MF |
1098 | #if 0 |
1099 | /* Ideally we would use i386_cpuid(), but it needs someone to run | |
1100 | native tests first to make sure things actually work. They should. | |
1101 | http://sourceware.org/ml/gdb-patches/2013-05/msg00164.html */ | |
1102 | unsigned int eax, ebx, ecx, edx; | |
1103 | ||
1104 | if (i386_cpuid (0, &eax, &ebx, &ecx, &edx)) | |
1105 | { | |
1106 | cpuid_max = eax; | |
1107 | memcpy (&vendor[0], &ebx, 4); | |
1108 | memcpy (&vendor[4], &ecx, 4); | |
1109 | memcpy (&vendor[8], &edx, 4); | |
1110 | cpuid_vendor[12] = '\0'; | |
1111 | } | |
1112 | #else | |
10ba702d EZ |
1113 | __asm__ __volatile__ ("xorl %%ebx, %%ebx;" |
1114 | "xorl %%ecx, %%ecx;" | |
1115 | "xorl %%edx, %%edx;" | |
1116 | "movl $0, %%eax;" | |
1117 | "cpuid;" | |
1118 | "movl %%ebx, %0;" | |
1119 | "movl %%edx, %1;" | |
1120 | "movl %%ecx, %2;" | |
1121 | "movl %%eax, %3;" | |
1122 | : "=m" (cpuid_vendor[0]), | |
1123 | "=m" (cpuid_vendor[4]), | |
1124 | "=m" (cpuid_vendor[8]), | |
1125 | "=m" (cpuid_max) | |
1126 | : | |
1127 | : "%eax", "%ebx", "%ecx", "%edx"); | |
1128 | cpuid_vendor[12] = '\0'; | |
4d157a3d | 1129 | #endif |
10ba702d EZ |
1130 | } |
1131 | ||
1132 | printf_filtered ("CPU Type.......................%s", u.machine); | |
1133 | if (cpuid_vendor[0]) | |
1134 | printf_filtered (" (%s)", cpuid_vendor); | |
1135 | puts_filtered ("\n"); | |
1136 | ||
1137 | /* CPUID with EAX = 1 returns processor signature and features. */ | |
1138 | if (cpuid_max >= 1) | |
1139 | { | |
1140 | static char *brand_name[] = { | |
1141 | "", | |
1142 | " Celeron", | |
1143 | " III", | |
1144 | " III Xeon", | |
1145 | "", "", "", "", | |
1146 | " 4" | |
1147 | }; | |
1148 | char cpu_string[80]; | |
1149 | char cpu_brand[20]; | |
1150 | unsigned brand_idx; | |
1151 | int intel_p = strcmp (cpuid_vendor, "GenuineIntel") == 0; | |
1152 | int amd_p = strcmp (cpuid_vendor, "AuthenticAMD") == 0; | |
1153 | unsigned cpu_family, cpu_model; | |
1154 | ||
4d157a3d MF |
1155 | #if 0 |
1156 | /* See comment above about cpuid usage. */ | |
1157 | i386_cpuid (1, &cpuid_eax, &cpuid_ebx, NULL, &cpuid_edx); | |
1158 | #else | |
10ba702d EZ |
1159 | __asm__ __volatile__ ("movl $1, %%eax;" |
1160 | "cpuid;" | |
1161 | : "=a" (cpuid_eax), | |
1162 | "=b" (cpuid_ebx), | |
1163 | "=d" (cpuid_edx) | |
1164 | : | |
1165 | : "%ecx"); | |
4d157a3d | 1166 | #endif |
10ba702d EZ |
1167 | brand_idx = cpuid_ebx & 0xff; |
1168 | cpu_family = (cpuid_eax >> 8) & 0xf; | |
1169 | cpu_model = (cpuid_eax >> 4) & 0xf; | |
1170 | cpu_brand[0] = '\0'; | |
1171 | if (intel_p) | |
1172 | { | |
1173 | if (brand_idx > 0 | |
1174 | && brand_idx < sizeof(brand_name)/sizeof(brand_name[0]) | |
1175 | && *brand_name[brand_idx]) | |
1176 | strcpy (cpu_brand, brand_name[brand_idx]); | |
1177 | else if (cpu_family == 5) | |
1178 | { | |
1179 | if (((cpuid_eax >> 12) & 3) == 0 && cpu_model == 4) | |
1180 | strcpy (cpu_brand, " MMX"); | |
1181 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 1) | |
1182 | strcpy (cpu_brand, " OverDrive"); | |
1183 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 2) | |
1184 | strcpy (cpu_brand, " Dual"); | |
1185 | } | |
1186 | else if (cpu_family == 6 && cpu_model < 8) | |
1187 | { | |
1188 | switch (cpu_model) | |
1189 | { | |
1190 | case 1: | |
1191 | strcpy (cpu_brand, " Pro"); | |
1192 | break; | |
1193 | case 3: | |
1194 | strcpy (cpu_brand, " II"); | |
1195 | break; | |
1196 | case 5: | |
1197 | strcpy (cpu_brand, " II Xeon"); | |
1198 | break; | |
1199 | case 6: | |
1200 | strcpy (cpu_brand, " Celeron"); | |
1201 | break; | |
1202 | case 7: | |
1203 | strcpy (cpu_brand, " III"); | |
1204 | break; | |
1205 | } | |
1206 | } | |
1207 | } | |
1208 | else if (amd_p) | |
1209 | { | |
1210 | switch (cpu_family) | |
1211 | { | |
1212 | case 4: | |
1213 | strcpy (cpu_brand, "486/5x86"); | |
1214 | break; | |
1215 | case 5: | |
1216 | switch (cpu_model) | |
1217 | { | |
1218 | case 0: | |
1219 | case 1: | |
1220 | case 2: | |
1221 | case 3: | |
1222 | strcpy (cpu_brand, "-K5"); | |
1223 | break; | |
1224 | case 6: | |
1225 | case 7: | |
1226 | strcpy (cpu_brand, "-K6"); | |
1227 | break; | |
1228 | case 8: | |
1229 | strcpy (cpu_brand, "-K6-2"); | |
1230 | break; | |
1231 | case 9: | |
1232 | strcpy (cpu_brand, "-K6-III"); | |
1233 | break; | |
1234 | } | |
1235 | break; | |
1236 | case 6: | |
1237 | switch (cpu_model) | |
1238 | { | |
1239 | case 1: | |
1240 | case 2: | |
1241 | case 4: | |
1242 | strcpy (cpu_brand, " Athlon"); | |
1243 | break; | |
1244 | case 3: | |
1245 | strcpy (cpu_brand, " Duron"); | |
1246 | break; | |
1247 | } | |
1248 | break; | |
1249 | } | |
1250 | } | |
8c042590 PM |
1251 | xsnprintf (cpu_string, sizeof (cpu_string), "%s%s Model %d Stepping %d", |
1252 | intel_p ? "Pentium" : (amd_p ? "AMD" : "ix86"), | |
1253 | cpu_brand, cpu_model, cpuid_eax & 0xf); | |
10ba702d EZ |
1254 | printfi_filtered (31, "%s\n", cpu_string); |
1255 | if (((cpuid_edx & (6 | (0x0d << 23))) != 0) | |
1256 | || ((cpuid_edx & 1) == 0) | |
1257 | || (amd_p && (cpuid_edx & (3 << 30)) != 0)) | |
1258 | { | |
1259 | puts_filtered ("CPU Features..................."); | |
1260 | /* We only list features which might be useful in the DPMI | |
1261 | environment. */ | |
1262 | if ((cpuid_edx & 1) == 0) | |
0963b4bd | 1263 | puts_filtered ("No FPU "); /* It's unusual to not have an FPU. */ |
10ba702d EZ |
1264 | if ((cpuid_edx & (1 << 1)) != 0) |
1265 | puts_filtered ("VME "); | |
1266 | if ((cpuid_edx & (1 << 2)) != 0) | |
1267 | puts_filtered ("DE "); | |
1268 | if ((cpuid_edx & (1 << 4)) != 0) | |
1269 | puts_filtered ("TSC "); | |
1270 | if ((cpuid_edx & (1 << 23)) != 0) | |
1271 | puts_filtered ("MMX "); | |
1272 | if ((cpuid_edx & (1 << 25)) != 0) | |
1273 | puts_filtered ("SSE "); | |
1274 | if ((cpuid_edx & (1 << 26)) != 0) | |
1275 | puts_filtered ("SSE2 "); | |
1276 | if (amd_p) | |
1277 | { | |
1278 | if ((cpuid_edx & (1 << 31)) != 0) | |
1279 | puts_filtered ("3DNow! "); | |
1280 | if ((cpuid_edx & (1 << 30)) != 0) | |
1281 | puts_filtered ("3DNow!Ext"); | |
1282 | } | |
1283 | puts_filtered ("\n"); | |
1284 | } | |
1285 | } | |
1286 | puts_filtered ("\n"); | |
1287 | printf_filtered ("DOS Version....................%s %s.%s", | |
1288 | _os_flavor, u.release, u.version); | |
1289 | if (true_dos_version != advertized_dos_version) | |
1290 | printf_filtered (" (disguised as v%d.%d)", _osmajor, _osminor); | |
1291 | puts_filtered ("\n"); | |
1292 | if (!windows_major) | |
1293 | go32_get_windows_version (); | |
1294 | if (windows_major != 0xff) | |
1295 | { | |
1296 | const char *windows_flavor; | |
1297 | ||
1298 | printf_filtered ("Windows Version................%d.%02d (Windows ", | |
1299 | windows_major, windows_minor); | |
1300 | switch (windows_major) | |
1301 | { | |
1302 | case 3: | |
1303 | windows_flavor = "3.X"; | |
1304 | break; | |
1305 | case 4: | |
1306 | switch (windows_minor) | |
1307 | { | |
1308 | case 0: | |
1309 | windows_flavor = "95, 95A, or 95B"; | |
1310 | break; | |
1311 | case 3: | |
1312 | windows_flavor = "95B OSR2.1 or 95C OSR2.5"; | |
1313 | break; | |
1314 | case 10: | |
1315 | windows_flavor = "98 or 98 SE"; | |
1316 | break; | |
1317 | case 90: | |
1318 | windows_flavor = "ME"; | |
1319 | break; | |
1320 | default: | |
1321 | windows_flavor = "9X"; | |
1322 | break; | |
1323 | } | |
1324 | break; | |
1325 | default: | |
1326 | windows_flavor = "??"; | |
1327 | break; | |
1328 | } | |
1329 | printf_filtered ("%s)\n", windows_flavor); | |
1330 | } | |
1331 | else if (true_dos_version == 0x532 && advertized_dos_version == 0x500) | |
0963b4bd MS |
1332 | printf_filtered ("Windows Version................" |
1333 | "Windows NT family (W2K/XP/W2K3/Vista/W2K8)\n"); | |
10ba702d | 1334 | puts_filtered ("\n"); |
d647eed6 EZ |
1335 | /* On some versions of Windows, __dpmi_get_capabilities returns |
1336 | zero, but the buffer is not filled with info, so we fill the | |
1337 | buffer with a known pattern and test for it afterwards. */ | |
1338 | memcpy (dpmi_vendor_info, test_pattern, sizeof(dpmi_vendor_info)); | |
1339 | dpmi_vendor_available = | |
1340 | __dpmi_get_capabilities (&dpmi_flags, dpmi_vendor_info); | |
1341 | if (dpmi_vendor_available == 0 | |
1342 | && memcmp (dpmi_vendor_info, test_pattern, | |
1343 | sizeof(dpmi_vendor_info)) != 0) | |
10ba702d EZ |
1344 | { |
1345 | /* The DPMI spec says the vendor string should be ASCIIZ, but | |
1346 | I don't trust the vendors to follow that... */ | |
1347 | if (!memchr (&dpmi_vendor_info[2], 0, 126)) | |
1348 | dpmi_vendor_info[128] = '\0'; | |
0963b4bd MS |
1349 | printf_filtered ("DPMI Host......................" |
1350 | "%s v%d.%d (capabilities: %#x)\n", | |
10ba702d EZ |
1351 | &dpmi_vendor_info[2], |
1352 | (unsigned)dpmi_vendor_info[0], | |
1353 | (unsigned)dpmi_vendor_info[1], | |
1354 | ((unsigned)dpmi_flags & 0x7f)); | |
1355 | } | |
d647eed6 EZ |
1356 | else |
1357 | printf_filtered ("DPMI Host......................(Info not available)\n"); | |
10ba702d EZ |
1358 | __dpmi_get_version (&dpmi_version_data); |
1359 | printf_filtered ("DPMI Version...................%d.%02d\n", | |
1360 | dpmi_version_data.major, dpmi_version_data.minor); | |
0963b4bd MS |
1361 | printf_filtered ("DPMI Info......................" |
1362 | "%s-bit DPMI, with%s Virtual Memory support\n", | |
10ba702d EZ |
1363 | (dpmi_version_data.flags & 1) ? "32" : "16", |
1364 | (dpmi_version_data.flags & 4) ? "" : "out"); | |
1365 | printfi_filtered (31, "Interrupts reflected to %s mode\n", | |
1366 | (dpmi_version_data.flags & 2) ? "V86" : "Real"); | |
1367 | printfi_filtered (31, "Processor type: i%d86\n", | |
1368 | dpmi_version_data.cpu); | |
1369 | printfi_filtered (31, "PIC base interrupt: Master: %#x Slave: %#x\n", | |
1370 | dpmi_version_data.master_pic, dpmi_version_data.slave_pic); | |
1371 | ||
1372 | /* a_tss is only initialized when the debuggee is first run. */ | |
1373 | if (prog_has_started) | |
1374 | { | |
1375 | __asm__ __volatile__ ("pushfl ; popl %0" : "=g" (eflags)); | |
0963b4bd MS |
1376 | printf_filtered ("Protection....................." |
1377 | "Ring %d (in %s), with%s I/O protection\n", | |
10ba702d EZ |
1378 | a_tss.tss_cs & 3, (a_tss.tss_cs & 4) ? "LDT" : "GDT", |
1379 | (a_tss.tss_cs & 3) > ((eflags >> 12) & 3) ? "" : "out"); | |
1380 | } | |
1381 | puts_filtered ("\n"); | |
1382 | __dpmi_get_free_memory_information (&mem_info); | |
1383 | print_mem (mem_info.total_number_of_physical_pages, | |
1384 | "DPMI Total Physical Memory.....", 1); | |
1385 | print_mem (mem_info.total_number_of_free_pages, | |
1386 | "DPMI Free Physical Memory......", 1); | |
1387 | print_mem (mem_info.size_of_paging_file_partition_in_pages, | |
1388 | "DPMI Swap Space................", 1); | |
1389 | print_mem (mem_info.linear_address_space_size_in_pages, | |
1390 | "DPMI Total Linear Address Size.", 1); | |
1391 | print_mem (mem_info.free_linear_address_space_in_pages, | |
1392 | "DPMI Free Linear Address Size..", 1); | |
1393 | print_mem (mem_info.largest_available_free_block_in_bytes, | |
1394 | "DPMI Largest Free Memory Block.", 0); | |
1395 | ||
1396 | regs.h.ah = 0x48; | |
1397 | regs.x.bx = 0xffff; | |
1398 | __dpmi_int (0x21, ®s); | |
1399 | print_mem (regs.x.bx << 4, "Free DOS Memory................", 0); | |
1400 | regs.x.ax = 0x5800; | |
1401 | __dpmi_int (0x21, ®s); | |
1402 | if ((regs.x.flags & 1) == 0) | |
1403 | { | |
1404 | static const char *dos_hilo[] = { | |
1405 | "Low", "", "", "", "High", "", "", "", "High, then Low" | |
1406 | }; | |
1407 | static const char *dos_fit[] = { | |
1408 | "First", "Best", "Last" | |
1409 | }; | |
1410 | int hilo_idx = (regs.x.ax >> 4) & 0x0f; | |
1411 | int fit_idx = regs.x.ax & 0x0f; | |
1412 | ||
1413 | if (hilo_idx > 8) | |
1414 | hilo_idx = 0; | |
1415 | if (fit_idx > 2) | |
1416 | fit_idx = 0; | |
1417 | printf_filtered ("DOS Memory Allocation..........%s memory, %s fit\n", | |
1418 | dos_hilo[hilo_idx], dos_fit[fit_idx]); | |
1419 | regs.x.ax = 0x5802; | |
1420 | __dpmi_int (0x21, ®s); | |
1421 | if ((regs.x.flags & 1) != 0) | |
1422 | regs.h.al = 0; | |
1423 | printfi_filtered (31, "UMBs %sin DOS memory chain\n", | |
1424 | regs.h.al == 0 ? "not " : ""); | |
1425 | } | |
1426 | } | |
1427 | ||
1428 | struct seg_descr { | |
9d0b3624 PA |
1429 | unsigned short limit0; |
1430 | unsigned short base0; | |
1431 | unsigned char base1; | |
1432 | unsigned stype:5; | |
1433 | unsigned dpl:2; | |
1434 | unsigned present:1; | |
1435 | unsigned limit1:4; | |
1436 | unsigned available:1; | |
1437 | unsigned dummy:1; | |
1438 | unsigned bit32:1; | |
1439 | unsigned page_granular:1; | |
1440 | unsigned char base2; | |
1441 | } __attribute__ ((packed)); | |
10ba702d EZ |
1442 | |
1443 | struct gate_descr { | |
9d0b3624 PA |
1444 | unsigned short offset0; |
1445 | unsigned short selector; | |
1446 | unsigned param_count:5; | |
1447 | unsigned dummy:3; | |
1448 | unsigned stype:5; | |
1449 | unsigned dpl:2; | |
1450 | unsigned present:1; | |
1451 | unsigned short offset1; | |
1452 | } __attribute__ ((packed)); | |
10ba702d EZ |
1453 | |
1454 | /* Read LEN bytes starting at logical address ADDR, and put the result | |
1455 | into DEST. Return 1 if success, zero if not. */ | |
1456 | static int | |
1457 | read_memory_region (unsigned long addr, void *dest, size_t len) | |
1458 | { | |
1459 | unsigned long dos_ds_limit = __dpmi_get_segment_limit (_dos_ds); | |
9f20bf26 | 1460 | int retval = 1; |
10ba702d EZ |
1461 | |
1462 | /* For the low memory, we can simply use _dos_ds. */ | |
1463 | if (addr <= dos_ds_limit - len) | |
1464 | dosmemget (addr, len, dest); | |
1465 | else | |
1466 | { | |
1467 | /* For memory above 1MB we need to set up a special segment to | |
1468 | be able to access that memory. */ | |
1469 | int sel = __dpmi_allocate_ldt_descriptors (1); | |
1470 | ||
9f20bf26 EZ |
1471 | if (sel <= 0) |
1472 | retval = 0; | |
1473 | else | |
1474 | { | |
1475 | int access_rights = __dpmi_get_descriptor_access_rights (sel); | |
1476 | size_t segment_limit = len - 1; | |
1477 | ||
1478 | /* Make sure the crucial bits in the descriptor access | |
1479 | rights are set correctly. Some DPMI providers might barf | |
1480 | if we set the segment limit to something that is not an | |
1481 | integral multiple of 4KB pages if the granularity bit is | |
1482 | not set to byte-granular, even though the DPMI spec says | |
1483 | it's the host's responsibility to set that bit correctly. */ | |
1484 | if (len > 1024 * 1024) | |
1485 | { | |
1486 | access_rights |= 0x8000; | |
1487 | /* Page-granular segments should have the low 12 bits of | |
1488 | the limit set. */ | |
1489 | segment_limit |= 0xfff; | |
1490 | } | |
1491 | else | |
1492 | access_rights &= ~0x8000; | |
1493 | ||
1494 | if (__dpmi_set_segment_base_address (sel, addr) != -1 | |
1495 | && __dpmi_set_descriptor_access_rights (sel, access_rights) != -1 | |
2033c18a EZ |
1496 | && __dpmi_set_segment_limit (sel, segment_limit) != -1 |
1497 | /* W2K silently fails to set the segment limit, leaving | |
1498 | it at zero; this test avoids the resulting crash. */ | |
1499 | && __dpmi_get_segment_limit (sel) >= segment_limit) | |
9f20bf26 EZ |
1500 | movedata (sel, 0, _my_ds (), (unsigned)dest, len); |
1501 | else | |
1502 | retval = 0; | |
1503 | ||
1504 | __dpmi_free_ldt_descriptor (sel); | |
1505 | } | |
10ba702d | 1506 | } |
9f20bf26 | 1507 | return retval; |
10ba702d EZ |
1508 | } |
1509 | ||
1510 | /* Get a segment descriptor stored at index IDX in the descriptor | |
1511 | table whose base address is TABLE_BASE. Return the descriptor | |
1512 | type, or -1 if failure. */ | |
1513 | static int | |
1514 | get_descriptor (unsigned long table_base, int idx, void *descr) | |
1515 | { | |
1516 | unsigned long addr = table_base + idx * 8; /* 8 bytes per entry */ | |
1517 | ||
1518 | if (read_memory_region (addr, descr, 8)) | |
1519 | return (int)((struct seg_descr *)descr)->stype; | |
1520 | return -1; | |
1521 | } | |
1522 | ||
1523 | struct dtr_reg { | |
1524 | unsigned short limit __attribute__((packed)); | |
1525 | unsigned long base __attribute__((packed)); | |
1526 | }; | |
1527 | ||
1528 | /* Display a segment descriptor stored at index IDX in a descriptor | |
1529 | table whose type is TYPE and whose base address is BASE_ADDR. If | |
1530 | FORCE is non-zero, display even invalid descriptors. */ | |
1531 | static void | |
1532 | display_descriptor (unsigned type, unsigned long base_addr, int idx, int force) | |
1533 | { | |
1534 | struct seg_descr descr; | |
1535 | struct gate_descr gate; | |
1536 | ||
1537 | /* Get the descriptor from the table. */ | |
1538 | if (idx == 0 && type == 0) | |
1539 | puts_filtered ("0x000: null descriptor\n"); | |
1540 | else if (get_descriptor (base_addr, idx, &descr) != -1) | |
1541 | { | |
1542 | /* For each type of descriptor table, this has a bit set if the | |
1543 | corresponding type of selectors is valid in that table. */ | |
1544 | static unsigned allowed_descriptors[] = { | |
1545 | 0xffffdafeL, /* GDT */ | |
1546 | 0x0000c0e0L, /* IDT */ | |
1547 | 0xffffdafaL /* LDT */ | |
1548 | }; | |
1549 | ||
1550 | /* If the program hasn't started yet, assume the debuggee will | |
1551 | have the same CPL as the debugger. */ | |
1552 | int cpl = prog_has_started ? (a_tss.tss_cs & 3) : _my_cs () & 3; | |
1553 | unsigned long limit = (descr.limit1 << 16) | descr.limit0; | |
1554 | ||
1555 | if (descr.present | |
1556 | && (allowed_descriptors[type] & (1 << descr.stype)) != 0) | |
1557 | { | |
1558 | printf_filtered ("0x%03x: ", | |
1559 | type == 1 | |
1560 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); | |
1561 | if (descr.page_granular) | |
1562 | limit = (limit << 12) | 0xfff; /* big segment: low 12 bit set */ | |
1563 | if (descr.stype == 1 || descr.stype == 2 || descr.stype == 3 | |
1564 | || descr.stype == 9 || descr.stype == 11 | |
1565 | || (descr.stype >= 16 && descr.stype < 32)) | |
1566 | printf_filtered ("base=0x%02x%02x%04x limit=0x%08lx", | |
1567 | descr.base2, descr.base1, descr.base0, limit); | |
1568 | ||
1569 | switch (descr.stype) | |
1570 | { | |
1571 | case 1: | |
1572 | case 3: | |
1573 | printf_filtered (" 16-bit TSS (task %sactive)", | |
1574 | descr.stype == 3 ? "" : "in"); | |
1575 | break; | |
1576 | case 2: | |
1577 | puts_filtered (" LDT"); | |
1578 | break; | |
1579 | case 4: | |
1580 | memcpy (&gate, &descr, sizeof gate); | |
1581 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1582 | gate.selector, gate.offset1, gate.offset0); | |
1583 | printf_filtered (" 16-bit Call Gate (params=%d)", | |
1584 | gate.param_count); | |
1585 | break; | |
1586 | case 5: | |
1587 | printf_filtered ("TSS selector=0x%04x", descr.base0); | |
1588 | printfi_filtered (16, "Task Gate"); | |
1589 | break; | |
1590 | case 6: | |
1591 | case 7: | |
1592 | memcpy (&gate, &descr, sizeof gate); | |
1593 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1594 | gate.selector, gate.offset1, gate.offset0); | |
1595 | printf_filtered (" 16-bit %s Gate", | |
1596 | descr.stype == 6 ? "Interrupt" : "Trap"); | |
1597 | break; | |
1598 | case 9: | |
1599 | case 11: | |
1600 | printf_filtered (" 32-bit TSS (task %sactive)", | |
1601 | descr.stype == 3 ? "" : "in"); | |
1602 | break; | |
1603 | case 12: | |
1604 | memcpy (&gate, &descr, sizeof gate); | |
1605 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1606 | gate.selector, gate.offset1, gate.offset0); | |
1607 | printf_filtered (" 32-bit Call Gate (params=%d)", | |
1608 | gate.param_count); | |
1609 | break; | |
1610 | case 14: | |
1611 | case 15: | |
1612 | memcpy (&gate, &descr, sizeof gate); | |
1613 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1614 | gate.selector, gate.offset1, gate.offset0); | |
1615 | printf_filtered (" 32-bit %s Gate", | |
1616 | descr.stype == 14 ? "Interrupt" : "Trap"); | |
1617 | break; | |
1618 | case 16: /* data segments */ | |
1619 | case 17: | |
1620 | case 18: | |
1621 | case 19: | |
1622 | case 20: | |
1623 | case 21: | |
1624 | case 22: | |
1625 | case 23: | |
1626 | printf_filtered (" %s-bit Data (%s Exp-%s%s)", | |
1627 | descr.bit32 ? "32" : "16", | |
0963b4bd MS |
1628 | descr.stype & 2 |
1629 | ? "Read/Write," : "Read-Only, ", | |
10ba702d EZ |
1630 | descr.stype & 4 ? "down" : "up", |
1631 | descr.stype & 1 ? "" : ", N.Acc"); | |
1632 | break; | |
1633 | case 24: /* code segments */ | |
1634 | case 25: | |
1635 | case 26: | |
1636 | case 27: | |
1637 | case 28: | |
1638 | case 29: | |
1639 | case 30: | |
1640 | case 31: | |
1641 | printf_filtered (" %s-bit Code (%s, %sConf%s)", | |
1642 | descr.bit32 ? "32" : "16", | |
1643 | descr.stype & 2 ? "Exec/Read" : "Exec-Only", | |
1644 | descr.stype & 4 ? "" : "N.", | |
1645 | descr.stype & 1 ? "" : ", N.Acc"); | |
1646 | break; | |
1647 | default: | |
1648 | printf_filtered ("Unknown type 0x%02x", descr.stype); | |
1649 | break; | |
1650 | } | |
1651 | puts_filtered ("\n"); | |
1652 | } | |
1653 | else if (force) | |
1654 | { | |
1655 | printf_filtered ("0x%03x: ", | |
1656 | type == 1 | |
1657 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); | |
1658 | if (!descr.present) | |
1659 | puts_filtered ("Segment not present\n"); | |
1660 | else | |
1661 | printf_filtered ("Segment type 0x%02x is invalid in this table\n", | |
1662 | descr.stype); | |
1663 | } | |
1664 | } | |
1665 | else if (force) | |
1666 | printf_filtered ("0x%03x: Cannot read this descriptor\n", idx); | |
1667 | } | |
1668 | ||
1669 | static void | |
1670 | go32_sldt (char *arg, int from_tty) | |
1671 | { | |
1672 | struct dtr_reg gdtr; | |
1673 | unsigned short ldtr = 0; | |
1674 | int ldt_idx; | |
1675 | struct seg_descr ldt_descr; | |
1676 | long ldt_entry = -1L; | |
1677 | int cpl = (prog_has_started ? a_tss.tss_cs : _my_cs ()) & 3; | |
1678 | ||
1679 | if (arg && *arg) | |
1680 | { | |
529480d0 | 1681 | arg = skip_spaces (arg); |
10ba702d EZ |
1682 | |
1683 | if (*arg) | |
1684 | { | |
1685 | ldt_entry = parse_and_eval_long (arg); | |
1686 | if (ldt_entry < 0 | |
1687 | || (ldt_entry & 4) == 0 | |
1688 | || (ldt_entry & 3) != (cpl & 3)) | |
8a3fe4f8 | 1689 | error (_("Invalid LDT entry 0x%03lx."), (unsigned long)ldt_entry); |
10ba702d EZ |
1690 | } |
1691 | } | |
1692 | ||
1693 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1694 | __asm__ __volatile__ ("sldt %0" : "=m" (ldtr) : /* no inputs */ ); | |
1695 | ldt_idx = ldtr / 8; | |
1696 | if (ldt_idx == 0) | |
1697 | puts_filtered ("There is no LDT.\n"); | |
1698 | /* LDT's entry in the GDT must have the type LDT, which is 2. */ | |
1699 | else if (get_descriptor (gdtr.base, ldt_idx, &ldt_descr) != 2) | |
1700 | printf_filtered ("LDT is present (at %#x), but unreadable by GDB.\n", | |
1701 | ldt_descr.base0 | |
1702 | | (ldt_descr.base1 << 16) | |
1703 | | (ldt_descr.base2 << 24)); | |
1704 | else | |
1705 | { | |
1706 | unsigned base = | |
1707 | ldt_descr.base0 | |
1708 | | (ldt_descr.base1 << 16) | |
1709 | | (ldt_descr.base2 << 24); | |
1710 | unsigned limit = ldt_descr.limit0 | (ldt_descr.limit1 << 16); | |
1711 | int max_entry; | |
1712 | ||
1713 | if (ldt_descr.page_granular) | |
1714 | /* Page-granular segments must have the low 12 bits of their | |
1715 | limit set. */ | |
1716 | limit = (limit << 12) | 0xfff; | |
1717 | /* LDT cannot have more than 8K 8-byte entries, i.e. more than | |
1718 | 64KB. */ | |
1719 | if (limit > 0xffff) | |
1720 | limit = 0xffff; | |
1721 | ||
1722 | max_entry = (limit + 1) / 8; | |
1723 | ||
1724 | if (ldt_entry >= 0) | |
1725 | { | |
1726 | if (ldt_entry > limit) | |
8a3fe4f8 | 1727 | error (_("Invalid LDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1728 | (unsigned long)ldt_entry, limit); |
10ba702d EZ |
1729 | |
1730 | display_descriptor (ldt_descr.stype, base, ldt_entry / 8, 1); | |
1731 | } | |
1732 | else | |
1733 | { | |
1734 | int i; | |
1735 | ||
1736 | for (i = 0; i < max_entry; i++) | |
1737 | display_descriptor (ldt_descr.stype, base, i, 0); | |
1738 | } | |
1739 | } | |
1740 | } | |
1741 | ||
1742 | static void | |
1743 | go32_sgdt (char *arg, int from_tty) | |
1744 | { | |
1745 | struct dtr_reg gdtr; | |
1746 | long gdt_entry = -1L; | |
1747 | int max_entry; | |
1748 | ||
1749 | if (arg && *arg) | |
1750 | { | |
529480d0 | 1751 | arg = skip_spaces (arg); |
10ba702d EZ |
1752 | |
1753 | if (*arg) | |
1754 | { | |
1755 | gdt_entry = parse_and_eval_long (arg); | |
1756 | if (gdt_entry < 0 || (gdt_entry & 7) != 0) | |
0963b4bd MS |
1757 | error (_("Invalid GDT entry 0x%03lx: " |
1758 | "not an integral multiple of 8."), | |
ccbc3e6f | 1759 | (unsigned long)gdt_entry); |
10ba702d EZ |
1760 | } |
1761 | } | |
1762 | ||
1763 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1764 | max_entry = (gdtr.limit + 1) / 8; | |
1765 | ||
1766 | if (gdt_entry >= 0) | |
1767 | { | |
1768 | if (gdt_entry > gdtr.limit) | |
8a3fe4f8 | 1769 | error (_("Invalid GDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1770 | (unsigned long)gdt_entry, gdtr.limit); |
10ba702d EZ |
1771 | |
1772 | display_descriptor (0, gdtr.base, gdt_entry / 8, 1); | |
1773 | } | |
1774 | else | |
1775 | { | |
1776 | int i; | |
1777 | ||
1778 | for (i = 0; i < max_entry; i++) | |
1779 | display_descriptor (0, gdtr.base, i, 0); | |
1780 | } | |
1781 | } | |
1782 | ||
1783 | static void | |
1784 | go32_sidt (char *arg, int from_tty) | |
1785 | { | |
1786 | struct dtr_reg idtr; | |
1787 | long idt_entry = -1L; | |
1788 | int max_entry; | |
1789 | ||
1790 | if (arg && *arg) | |
1791 | { | |
529480d0 | 1792 | arg = skip_spaces (arg); |
10ba702d EZ |
1793 | |
1794 | if (*arg) | |
1795 | { | |
1796 | idt_entry = parse_and_eval_long (arg); | |
1797 | if (idt_entry < 0) | |
8a3fe4f8 | 1798 | error (_("Invalid (negative) IDT entry %ld."), idt_entry); |
10ba702d EZ |
1799 | } |
1800 | } | |
1801 | ||
1802 | __asm__ __volatile__ ("sidt %0" : "=m" (idtr) : /* no inputs */ ); | |
1803 | max_entry = (idtr.limit + 1) / 8; | |
0963b4bd | 1804 | if (max_entry > 0x100) /* No more than 256 entries. */ |
10ba702d EZ |
1805 | max_entry = 0x100; |
1806 | ||
1807 | if (idt_entry >= 0) | |
1808 | { | |
1809 | if (idt_entry > idtr.limit) | |
8a3fe4f8 | 1810 | error (_("Invalid IDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1811 | (unsigned long)idt_entry, idtr.limit); |
10ba702d EZ |
1812 | |
1813 | display_descriptor (1, idtr.base, idt_entry, 1); | |
1814 | } | |
1815 | else | |
1816 | { | |
1817 | int i; | |
1818 | ||
1819 | for (i = 0; i < max_entry; i++) | |
1820 | display_descriptor (1, idtr.base, i, 0); | |
1821 | } | |
1822 | } | |
1823 | ||
9f20bf26 EZ |
1824 | /* Cached linear address of the base of the page directory. For |
1825 | now, available only under CWSDPMI. Code based on ideas and | |
1826 | suggestions from Charles Sandmann <sandmann@clio.rice.edu>. */ | |
1827 | static unsigned long pdbr; | |
1828 | ||
1829 | static unsigned long | |
1830 | get_cr3 (void) | |
1831 | { | |
1832 | unsigned offset; | |
1833 | unsigned taskreg; | |
1834 | unsigned long taskbase, cr3; | |
1835 | struct dtr_reg gdtr; | |
1836 | ||
1837 | if (pdbr > 0 && pdbr <= 0xfffff) | |
1838 | return pdbr; | |
1839 | ||
1840 | /* Get the linear address of GDT and the Task Register. */ | |
1841 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1842 | __asm__ __volatile__ ("str %0" : "=m" (taskreg) : /* no inputs */ ); | |
1843 | ||
1844 | /* Task Register is a segment selector for the TSS of the current | |
1845 | task. Therefore, it can be used as an index into the GDT to get | |
1846 | at the segment descriptor for the TSS. To get the index, reset | |
1847 | the low 3 bits of the selector (which give the CPL). Add 2 to the | |
1848 | offset to point to the 3 low bytes of the base address. */ | |
1849 | offset = gdtr.base + (taskreg & 0xfff8) + 2; | |
1850 | ||
1851 | ||
1852 | /* CWSDPMI's task base is always under the 1MB mark. */ | |
1853 | if (offset > 0xfffff) | |
1854 | return 0; | |
1855 | ||
1856 | _farsetsel (_dos_ds); | |
1857 | taskbase = _farnspeekl (offset) & 0xffffffU; | |
1858 | taskbase += _farnspeekl (offset + 2) & 0xff000000U; | |
1859 | if (taskbase > 0xfffff) | |
1860 | return 0; | |
1861 | ||
1862 | /* CR3 (a.k.a. PDBR, the Page Directory Base Register) is stored at | |
1863 | offset 1Ch in the TSS. */ | |
1864 | cr3 = _farnspeekl (taskbase + 0x1c) & ~0xfff; | |
1865 | if (cr3 > 0xfffff) | |
1866 | { | |
0963b4bd | 1867 | #if 0 /* Not fullly supported yet. */ |
9f20bf26 EZ |
1868 | /* The Page Directory is in UMBs. In that case, CWSDPMI puts |
1869 | the first Page Table right below the Page Directory. Thus, | |
1870 | the first Page Table's entry for its own address and the Page | |
1871 | Directory entry for that Page Table will hold the same | |
1872 | physical address. The loop below searches the entire UMB | |
1873 | range of addresses for such an occurence. */ | |
1874 | unsigned long addr, pte_idx; | |
1875 | ||
1876 | for (addr = 0xb0000, pte_idx = 0xb0; | |
1877 | pte_idx < 0xff; | |
1878 | addr += 0x1000, pte_idx++) | |
1879 | { | |
1880 | if (((_farnspeekl (addr + 4 * pte_idx) & 0xfffff027) == | |
1881 | (_farnspeekl (addr + 0x1000) & 0xfffff027)) | |
1882 | && ((_farnspeekl (addr + 4 * pte_idx + 4) & 0xfffff000) == cr3)) | |
1883 | { | |
1884 | cr3 = addr + 0x1000; | |
1885 | break; | |
1886 | } | |
1887 | } | |
a3b9cbb3 | 1888 | #endif |
9f20bf26 EZ |
1889 | |
1890 | if (cr3 > 0xfffff) | |
1891 | cr3 = 0; | |
1892 | } | |
1893 | ||
1894 | return cr3; | |
1895 | } | |
1896 | ||
1897 | /* Return the N'th Page Directory entry. */ | |
1898 | static unsigned long | |
1899 | get_pde (int n) | |
1900 | { | |
1901 | unsigned long pde = 0; | |
1902 | ||
1903 | if (pdbr && n >= 0 && n < 1024) | |
1904 | { | |
1905 | pde = _farpeekl (_dos_ds, pdbr + 4*n); | |
1906 | } | |
1907 | return pde; | |
1908 | } | |
1909 | ||
1910 | /* Return the N'th entry of the Page Table whose Page Directory entry | |
1911 | is PDE. */ | |
1912 | static unsigned long | |
1913 | get_pte (unsigned long pde, int n) | |
1914 | { | |
1915 | unsigned long pte = 0; | |
1916 | ||
1917 | /* pde & 0x80 tests the 4MB page bit. We don't support 4MB | |
1918 | page tables, for now. */ | |
1919 | if ((pde & 1) && !(pde & 0x80) && n >= 0 && n < 1024) | |
1920 | { | |
0963b4bd | 1921 | pde &= ~0xfff; /* Clear non-address bits. */ |
9f20bf26 EZ |
1922 | pte = _farpeekl (_dos_ds, pde + 4*n); |
1923 | } | |
1924 | return pte; | |
1925 | } | |
1926 | ||
1927 | /* Display a Page Directory or Page Table entry. IS_DIR, if non-zero, | |
1928 | says this is a Page Directory entry. If FORCE is non-zero, display | |
1929 | the entry even if its Present flag is off. OFF is the offset of the | |
1930 | address from the page's base address. */ | |
1931 | static void | |
1932 | display_ptable_entry (unsigned long entry, int is_dir, int force, unsigned off) | |
1933 | { | |
1934 | if ((entry & 1) != 0) | |
1935 | { | |
1936 | printf_filtered ("Base=0x%05lx000", entry >> 12); | |
1937 | if ((entry & 0x100) && !is_dir) | |
1938 | puts_filtered (" Global"); | |
1939 | if ((entry & 0x40) && !is_dir) | |
1940 | puts_filtered (" Dirty"); | |
1941 | printf_filtered (" %sAcc.", (entry & 0x20) ? "" : "Not-"); | |
1942 | printf_filtered (" %sCached", (entry & 0x10) ? "" : "Not-"); | |
1943 | printf_filtered (" Write-%s", (entry & 8) ? "Thru" : "Back"); | |
1944 | printf_filtered (" %s", (entry & 4) ? "Usr" : "Sup"); | |
1945 | printf_filtered (" Read-%s", (entry & 2) ? "Write" : "Only"); | |
1946 | if (off) | |
1947 | printf_filtered (" +0x%x", off); | |
1948 | puts_filtered ("\n"); | |
1949 | } | |
1950 | else if (force) | |
1951 | printf_filtered ("Page%s not present or not supported; value=0x%lx.\n", | |
1952 | is_dir ? " Table" : "", entry >> 1); | |
1953 | } | |
1954 | ||
1955 | static void | |
1956 | go32_pde (char *arg, int from_tty) | |
1957 | { | |
1958 | long pde_idx = -1, i; | |
1959 | ||
1960 | if (arg && *arg) | |
1961 | { | |
529480d0 | 1962 | arg = skip_spaces (arg); |
9f20bf26 EZ |
1963 | |
1964 | if (*arg) | |
1965 | { | |
1966 | pde_idx = parse_and_eval_long (arg); | |
1967 | if (pde_idx < 0 || pde_idx >= 1024) | |
8a3fe4f8 | 1968 | error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx); |
9f20bf26 EZ |
1969 | } |
1970 | } | |
1971 | ||
1972 | pdbr = get_cr3 (); | |
1973 | if (!pdbr) | |
0963b4bd MS |
1974 | puts_filtered ("Access to Page Directories is " |
1975 | "not supported on this system.\n"); | |
9f20bf26 EZ |
1976 | else if (pde_idx >= 0) |
1977 | display_ptable_entry (get_pde (pde_idx), 1, 1, 0); | |
1978 | else | |
1979 | for (i = 0; i < 1024; i++) | |
1980 | display_ptable_entry (get_pde (i), 1, 0, 0); | |
1981 | } | |
1982 | ||
1983 | /* A helper function to display entries in a Page Table pointed to by | |
1984 | the N'th entry in the Page Directory. If FORCE is non-zero, say | |
1985 | something even if the Page Table is not accessible. */ | |
1986 | static void | |
1987 | display_page_table (long n, int force) | |
1988 | { | |
1989 | unsigned long pde = get_pde (n); | |
1990 | ||
1991 | if ((pde & 1) != 0) | |
1992 | { | |
1993 | int i; | |
1994 | ||
0963b4bd MS |
1995 | printf_filtered ("Page Table pointed to by " |
1996 | "Page Directory entry 0x%lx:\n", n); | |
9f20bf26 EZ |
1997 | for (i = 0; i < 1024; i++) |
1998 | display_ptable_entry (get_pte (pde, i), 0, 0, 0); | |
1999 | puts_filtered ("\n"); | |
2000 | } | |
2001 | else if (force) | |
2002 | printf_filtered ("Page Table not present; value=0x%lx.\n", pde >> 1); | |
2003 | } | |
2004 | ||
2005 | static void | |
2006 | go32_pte (char *arg, int from_tty) | |
2007 | { | |
ccbc3e6f | 2008 | long pde_idx = -1L, i; |
9f20bf26 EZ |
2009 | |
2010 | if (arg && *arg) | |
2011 | { | |
529480d0 | 2012 | arg = skip_spaces (arg); |
9f20bf26 EZ |
2013 | |
2014 | if (*arg) | |
2015 | { | |
2016 | pde_idx = parse_and_eval_long (arg); | |
2017 | if (pde_idx < 0 || pde_idx >= 1024) | |
8a3fe4f8 | 2018 | error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx); |
9f20bf26 EZ |
2019 | } |
2020 | } | |
2021 | ||
2022 | pdbr = get_cr3 (); | |
2023 | if (!pdbr) | |
2024 | puts_filtered ("Access to Page Tables is not supported on this system.\n"); | |
2025 | else if (pde_idx >= 0) | |
2026 | display_page_table (pde_idx, 1); | |
2027 | else | |
2028 | for (i = 0; i < 1024; i++) | |
2029 | display_page_table (i, 0); | |
2030 | } | |
2031 | ||
2032 | static void | |
2033 | go32_pte_for_address (char *arg, int from_tty) | |
2034 | { | |
2035 | CORE_ADDR addr = 0, i; | |
2036 | ||
2037 | if (arg && *arg) | |
2038 | { | |
529480d0 | 2039 | arg = skip_spaces (arg); |
9f20bf26 EZ |
2040 | |
2041 | if (*arg) | |
2042 | addr = parse_and_eval_address (arg); | |
2043 | } | |
2044 | if (!addr) | |
e2e0b3e5 | 2045 | error_no_arg (_("linear address")); |
9f20bf26 EZ |
2046 | |
2047 | pdbr = get_cr3 (); | |
2048 | if (!pdbr) | |
2049 | puts_filtered ("Access to Page Tables is not supported on this system.\n"); | |
2050 | else | |
2051 | { | |
2052 | int pde_idx = (addr >> 22) & 0x3ff; | |
2053 | int pte_idx = (addr >> 12) & 0x3ff; | |
2054 | unsigned offs = addr & 0xfff; | |
2055 | ||
2244ba2e PM |
2056 | printf_filtered ("Page Table entry for address %s:\n", |
2057 | hex_string(addr)); | |
9f20bf26 EZ |
2058 | display_ptable_entry (get_pte (get_pde (pde_idx), pte_idx), 0, 1, offs); |
2059 | } | |
2060 | } | |
2061 | ||
d8c852a1 EZ |
2062 | static struct cmd_list_element *info_dos_cmdlist = NULL; |
2063 | ||
2064 | static void | |
2065 | go32_info_dos_command (char *args, int from_tty) | |
2066 | { | |
2067 | help_list (info_dos_cmdlist, "info dos ", class_info, gdb_stdout); | |
2068 | } | |
2069 | ||
70976b65 YQ |
2070 | /* -Wmissing-prototypes */ |
2071 | extern initialize_file_ftype _initialize_go32_nat; | |
2072 | ||
e49d4fa6 SS |
2073 | void |
2074 | _initialize_go32_nat (void) | |
2075 | { | |
c1a7b7c6 PA |
2076 | struct target_ops *t = go32_target (); |
2077 | ||
2078 | i386_dr_low.set_control = go32_set_dr7; | |
2079 | i386_dr_low.set_addr = go32_set_dr; | |
2080 | i386_dr_low.get_status = go32_get_dr6; | |
2081 | i386_dr_low.get_control = go32_get_dr7; | |
2082 | i386_dr_low.get_addr = go32_get_dr; | |
2083 | i386_set_debug_register_length (4); | |
2084 | ||
2085 | i386_use_watchpoints (t); | |
2086 | add_target (t); | |
2087 | ||
2088 | /* Initialize child's cwd as empty to be initialized when starting | |
2089 | the child. */ | |
2090 | *child_cwd = 0; | |
2091 | ||
2092 | /* Initialize child's command line storage. */ | |
2093 | if (redir_debug_init (&child_cmd) == -1) | |
2094 | internal_error (__FILE__, __LINE__, | |
2095 | _("Cannot allocate redirection storage: " | |
2096 | "not enough memory.\n")); | |
2097 | ||
2098 | /* We are always processing GCC-compiled programs. */ | |
2099 | processing_gcc_compilation = 2; | |
10ba702d | 2100 | |
1bedd215 AC |
2101 | add_prefix_cmd ("dos", class_info, go32_info_dos_command, _("\ |
2102 | Print information specific to DJGPP (aka MS-DOS) debugging."), | |
d8c852a1 EZ |
2103 | &info_dos_cmdlist, "info dos ", 0, &infolist); |
2104 | ||
1a966eab AC |
2105 | add_cmd ("sysinfo", class_info, go32_sysinfo, _("\ |
2106 | Display information about the target system, including CPU, OS, DPMI, etc."), | |
d8c852a1 | 2107 | &info_dos_cmdlist); |
1a966eab AC |
2108 | add_cmd ("ldt", class_info, go32_sldt, _("\ |
2109 | Display entries in the LDT (Local Descriptor Table).\n\ | |
2110 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2111 | &info_dos_cmdlist); |
1a966eab AC |
2112 | add_cmd ("gdt", class_info, go32_sgdt, _("\ |
2113 | Display entries in the GDT (Global Descriptor Table).\n\ | |
2114 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2115 | &info_dos_cmdlist); |
1a966eab AC |
2116 | add_cmd ("idt", class_info, go32_sidt, _("\ |
2117 | Display entries in the IDT (Interrupt Descriptor Table).\n\ | |
2118 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2119 | &info_dos_cmdlist); |
1a966eab AC |
2120 | add_cmd ("pde", class_info, go32_pde, _("\ |
2121 | Display entries in the Page Directory.\n\ | |
2122 | Entry number (an expression) as an argument means display only that entry."), | |
9f20bf26 | 2123 | &info_dos_cmdlist); |
1a966eab AC |
2124 | add_cmd ("pte", class_info, go32_pte, _("\ |
2125 | Display entries in Page Tables.\n\ | |
2126 | Entry number (an expression) as an argument means display only entries\n\ | |
2127 | from the Page Table pointed to by the specified Page Directory entry."), | |
9f20bf26 | 2128 | &info_dos_cmdlist); |
1a966eab AC |
2129 | add_cmd ("address-pte", class_info, go32_pte_for_address, _("\ |
2130 | Display a Page Table entry for a linear address.\n\ | |
2131 | The address argument must be a linear address, after adding to\n\ | |
2132 | it the base address of the appropriate segment.\n\ | |
2133 | The base address of variables and functions in the debuggee's data\n\ | |
2134 | or code segment is stored in the variable __djgpp_base_address,\n\ | |
2135 | so use `__djgpp_base_address + (char *)&var' as the argument.\n\ | |
2136 | For other segments, look up their base address in the output of\n\ | |
2137 | the `info dos ldt' command."), | |
9f20bf26 | 2138 | &info_dos_cmdlist); |
e49d4fa6 | 2139 | } |
53a5351d JM |
2140 | |
2141 | pid_t | |
2142 | tcgetpgrp (int fd) | |
2143 | { | |
2144 | if (isatty (fd)) | |
2145 | return SOME_PID; | |
2146 | errno = ENOTTY; | |
2147 | return -1; | |
2148 | } | |
2149 | ||
2150 | int | |
2151 | tcsetpgrp (int fd, pid_t pgid) | |
2152 | { | |
2153 | if (isatty (fd) && pgid == SOME_PID) | |
2154 | return 0; | |
2155 | errno = pgid == SOME_PID ? ENOTTY : ENOSYS; | |
2156 | return -1; | |
2157 | } |