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e49d4fa6 | 1 | /* Native debugging support for Intel x86 running DJGPP. |
1d506c26 | 2 | Copyright (C) 1997-2024 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 | 84 | |
e49d4fa6 SS |
85 | #include <fcntl.h> |
86 | ||
df7e5265 | 87 | #include "x86-nat.h" |
e49d4fa6 | 88 | #include "inferior.h" |
45741a9c | 89 | #include "infrun.h" |
444c3224 | 90 | #include "gdbthread.h" |
268a13a5 | 91 | #include "gdbsupport/gdb_wait.h" |
e49d4fa6 SS |
92 | #include "gdbcore.h" |
93 | #include "command.h" | |
5b9707eb | 94 | #include "cli/cli-cmds.h" |
e49d4fa6 | 95 | #include "floatformat.h" |
0baae8db | 96 | #include "buildsym-legacy.h" |
e750d25e | 97 | #include "i387-tdep.h" |
e1195560 | 98 | #include "i386-tdep.h" |
df7e5265 | 99 | #include "nat/x86-cpuid.h" |
4d277981 | 100 | #include "value.h" |
4e052eda | 101 | #include "regcache.h" |
eaae3919 | 102 | #include "top.h" |
529480d0 | 103 | #include "cli/cli-utils.h" |
c1a7b7c6 | 104 | #include "inf-child.h" |
e49d4fa6 | 105 | |
10ba702d | 106 | #include <ctype.h> |
c2c6d25f | 107 | #include <unistd.h> |
10ba702d | 108 | #include <sys/utsname.h> |
53a5351d | 109 | #include <io.h> |
10ba702d | 110 | #include <dos.h> |
53a5351d | 111 | #include <dpmi.h> |
10ba702d | 112 | #include <go32.h> |
9f20bf26 | 113 | #include <sys/farptr.h> |
e49d4fa6 SS |
114 | #include <debug/v2load.h> |
115 | #include <debug/dbgcom.h> | |
53a5351d JM |
116 | #if __DJGPP_MINOR__ > 2 |
117 | #include <debug/redir.h> | |
118 | #endif | |
e49d4fa6 | 119 | |
10085bb5 EZ |
120 | #include <langinfo.h> |
121 | ||
b83266a0 | 122 | #if __DJGPP_MINOR__ < 3 |
0963b4bd MS |
123 | /* This code will be provided from DJGPP 2.03 on. Until then I code it |
124 | here. */ | |
c5aa993b JM |
125 | typedef struct |
126 | { | |
127 | unsigned short sig0; | |
128 | unsigned short sig1; | |
129 | unsigned short sig2; | |
130 | unsigned short sig3; | |
131 | unsigned short exponent:15; | |
132 | unsigned short sign:1; | |
133 | } | |
134 | NPXREG; | |
135 | ||
136 | typedef struct | |
137 | { | |
138 | unsigned int control; | |
139 | unsigned int status; | |
140 | unsigned int tag; | |
141 | unsigned int eip; | |
142 | unsigned int cs; | |
143 | unsigned int dataptr; | |
144 | unsigned int datasel; | |
145 | NPXREG reg[8]; | |
146 | } | |
147 | NPX; | |
b83266a0 SS |
148 | |
149 | static NPX npx; | |
150 | ||
0963b4bd MS |
151 | static void save_npx (void); /* Save the FPU of the debugged program. */ |
152 | static void load_npx (void); /* Restore the FPU of the debugged program. */ | |
b83266a0 SS |
153 | |
154 | /* ------------------------------------------------------------------------- */ | |
155 | /* Store the contents of the NPX in the global variable `npx'. */ | |
156 | ||
157 | static void | |
158 | save_npx (void) | |
159 | { | |
1f5dc670 EZ |
160 | asm ("inb $0xa0, %%al \n\ |
161 | testb $0x20, %%al \n\ | |
162 | jz 1f \n\ | |
82cc5033 EZ |
163 | xorb %%al, %%al \n\ |
164 | outb %%al, $0xf0 \n\ | |
1f5dc670 | 165 | movb $0x20, %%al \n\ |
82cc5033 EZ |
166 | outb %%al, $0xa0 \n\ |
167 | outb %%al, $0x20 \n\ | |
1f5dc670 | 168 | 1: \n\ |
82cc5033 | 169 | fnsave %0 \n\ |
c5aa993b JM |
170 | fwait " |
171 | : "=m" (npx) | |
172 | : /* No input */ | |
173 | : "%eax"); | |
b83266a0 | 174 | } |
c5aa993b | 175 | |
c5aa993b JM |
176 | |
177 | ||
b83266a0 SS |
178 | /* ------------------------------------------------------------------------- */ |
179 | /* Reload the contents of the NPX from the global variable `npx'. */ | |
180 | ||
181 | static void | |
182 | load_npx (void) | |
183 | { | |
ba8629a9 | 184 | asm ("frstor %0":"=m" (npx)); |
b83266a0 | 185 | } |
53a5351d JM |
186 | /* ------------------------------------------------------------------------- */ |
187 | /* Stubs for the missing redirection functions. */ | |
188 | typedef struct { | |
189 | char *command; | |
190 | int redirected; | |
191 | } cmdline_t; | |
192 | ||
4d277981 | 193 | void |
ba8629a9 EZ |
194 | redir_cmdline_delete (cmdline_t *ptr) |
195 | { | |
196 | ptr->redirected = 0; | |
197 | } | |
4d277981 EZ |
198 | |
199 | int | |
200 | redir_cmdline_parse (const char *args, cmdline_t *ptr) | |
53a5351d JM |
201 | { |
202 | return -1; | |
203 | } | |
ba8629a9 | 204 | |
4d277981 EZ |
205 | int |
206 | redir_to_child (cmdline_t *ptr) | |
53a5351d JM |
207 | { |
208 | return 1; | |
209 | } | |
ba8629a9 | 210 | |
4d277981 EZ |
211 | int |
212 | redir_to_debugger (cmdline_t *ptr) | |
53a5351d JM |
213 | { |
214 | return 1; | |
215 | } | |
ba8629a9 | 216 | |
4d277981 | 217 | int |
ba8629a9 EZ |
218 | redir_debug_init (cmdline_t *ptr) |
219 | { | |
220 | return 0; | |
221 | } | |
b83266a0 SS |
222 | #endif /* __DJGPP_MINOR < 3 */ |
223 | ||
53a5351d JM |
224 | typedef enum { wp_insert, wp_remove, wp_count } wp_op; |
225 | ||
226 | /* This holds the current reference counts for each debug register. */ | |
227 | static int dr_ref_count[4]; | |
228 | ||
e49d4fa6 SS |
229 | #define SOME_PID 42 |
230 | ||
e49d4fa6 | 231 | static int prog_has_started = 0; |
b83266a0 | 232 | |
53a5351d | 233 | #define r_ofs(x) (offsetof(TSS,x)) |
e49d4fa6 SS |
234 | |
235 | static struct | |
236 | { | |
53a5351d JM |
237 | size_t tss_ofs; |
238 | size_t size; | |
e49d4fa6 SS |
239 | } |
240 | regno_mapping[] = | |
241 | { | |
0fff5247 EZ |
242 | {r_ofs (tss_eax), 4}, /* normal registers, from a_tss */ |
243 | {r_ofs (tss_ecx), 4}, | |
244 | {r_ofs (tss_edx), 4}, | |
245 | {r_ofs (tss_ebx), 4}, | |
246 | {r_ofs (tss_esp), 4}, | |
247 | {r_ofs (tss_ebp), 4}, | |
248 | {r_ofs (tss_esi), 4}, | |
249 | {r_ofs (tss_edi), 4}, | |
250 | {r_ofs (tss_eip), 4}, | |
251 | {r_ofs (tss_eflags), 4}, | |
252 | {r_ofs (tss_cs), 2}, | |
253 | {r_ofs (tss_ss), 2}, | |
254 | {r_ofs (tss_ds), 2}, | |
255 | {r_ofs (tss_es), 2}, | |
256 | {r_ofs (tss_fs), 2}, | |
257 | {r_ofs (tss_gs), 2}, | |
258 | {0, 10}, /* 8 FP registers, from npx.reg[] */ | |
259 | {1, 10}, | |
260 | {2, 10}, | |
261 | {3, 10}, | |
262 | {4, 10}, | |
263 | {5, 10}, | |
264 | {6, 10}, | |
265 | {7, 10}, | |
53a5351d | 266 | /* The order of the next 7 registers must be consistent |
0fff5247 EZ |
267 | with their numbering in config/i386/tm-i386.h, which see. */ |
268 | {0, 2}, /* control word, from npx */ | |
269 | {4, 2}, /* status word, from npx */ | |
270 | {8, 2}, /* tag word, from npx */ | |
271 | {16, 2}, /* last FP exception CS from npx */ | |
272 | {12, 4}, /* last FP exception EIP from npx */ | |
273 | {24, 2}, /* last FP exception operand selector from npx */ | |
274 | {20, 4}, /* last FP exception operand offset from npx */ | |
275 | {18, 2} /* last FP opcode from npx */ | |
e49d4fa6 SS |
276 | }; |
277 | ||
278 | static struct | |
279 | { | |
280 | int go32_sig; | |
2ea28649 | 281 | enum gdb_signal gdb_sig; |
e49d4fa6 SS |
282 | } |
283 | sig_map[] = | |
284 | { | |
a493e3e2 PA |
285 | {0, GDB_SIGNAL_FPE}, |
286 | {1, GDB_SIGNAL_TRAP}, | |
53a5351d JM |
287 | /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL, |
288 | but I think SIGBUS is better, since the NMI is usually activated | |
289 | as a result of a memory parity check failure. */ | |
a493e3e2 PA |
290 | {2, GDB_SIGNAL_BUS}, |
291 | {3, GDB_SIGNAL_TRAP}, | |
292 | {4, GDB_SIGNAL_FPE}, | |
293 | {5, GDB_SIGNAL_SEGV}, | |
294 | {6, GDB_SIGNAL_ILL}, | |
295 | {7, GDB_SIGNAL_EMT}, /* no-coprocessor exception */ | |
296 | {8, GDB_SIGNAL_SEGV}, | |
297 | {9, GDB_SIGNAL_SEGV}, | |
298 | {10, GDB_SIGNAL_BUS}, | |
299 | {11, GDB_SIGNAL_SEGV}, | |
300 | {12, GDB_SIGNAL_SEGV}, | |
301 | {13, GDB_SIGNAL_SEGV}, | |
302 | {14, GDB_SIGNAL_SEGV}, | |
303 | {16, GDB_SIGNAL_FPE}, | |
304 | {17, GDB_SIGNAL_BUS}, | |
305 | {31, GDB_SIGNAL_ILL}, | |
306 | {0x1b, GDB_SIGNAL_INT}, | |
307 | {0x75, GDB_SIGNAL_FPE}, | |
308 | {0x78, GDB_SIGNAL_ALRM}, | |
309 | {0x79, GDB_SIGNAL_INT}, | |
310 | {0x7a, GDB_SIGNAL_QUIT}, | |
311 | {-1, GDB_SIGNAL_LAST} | |
e49d4fa6 SS |
312 | }; |
313 | ||
53a5351d | 314 | static struct { |
2ea28649 | 315 | enum gdb_signal gdb_sig; |
53a5351d JM |
316 | int djgpp_excepno; |
317 | } excepn_map[] = { | |
a493e3e2 PA |
318 | {GDB_SIGNAL_0, -1}, |
319 | {GDB_SIGNAL_ILL, 6}, /* Invalid Opcode */ | |
320 | {GDB_SIGNAL_EMT, 7}, /* triggers SIGNOFP */ | |
321 | {GDB_SIGNAL_SEGV, 13}, /* GPF */ | |
322 | {GDB_SIGNAL_BUS, 17}, /* Alignment Check */ | |
53a5351d JM |
323 | /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for |
324 | details. */ | |
a493e3e2 PA |
325 | {GDB_SIGNAL_TERM, 0x1b}, /* triggers Ctrl-Break type of SIGINT */ |
326 | {GDB_SIGNAL_FPE, 0x75}, | |
327 | {GDB_SIGNAL_INT, 0x79}, | |
328 | {GDB_SIGNAL_QUIT, 0x7a}, | |
329 | {GDB_SIGNAL_ALRM, 0x78}, /* triggers SIGTIMR */ | |
330 | {GDB_SIGNAL_PROF, 0x78}, | |
331 | {GDB_SIGNAL_LAST, -1} | |
53a5351d JM |
332 | }; |
333 | ||
f6ac5f3d PA |
334 | /* The go32 target. */ |
335 | ||
336 | struct go32_nat_target final : public x86_nat_target<inf_child_target> | |
337 | { | |
338 | void attach (const char *, int) override; | |
339 | ||
340 | void resume (ptid_t, int, enum gdb_signal) override; | |
341 | ||
b60cea74 | 342 | ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override; |
f6ac5f3d PA |
343 | |
344 | void fetch_registers (struct regcache *, int) override; | |
345 | void store_registers (struct regcache *, int) override; | |
346 | ||
347 | enum target_xfer_status xfer_partial (enum target_object object, | |
348 | const char *annex, | |
349 | gdb_byte *readbuf, | |
350 | const gdb_byte *writebuf, | |
351 | ULONGEST offset, ULONGEST len, | |
352 | ULONGEST *xfered_len) override; | |
353 | ||
354 | void files_info () override; | |
355 | ||
356 | void terminal_init () override; | |
357 | ||
358 | void terminal_inferior () override; | |
359 | ||
360 | void terminal_ours_for_output () override; | |
361 | ||
362 | void terminal_ours () override; | |
363 | ||
364 | void terminal_info (const char *, int) override; | |
365 | ||
366 | void pass_ctrlc () override; | |
367 | ||
368 | void kill () override; | |
369 | ||
370 | void create_inferior (const char *, const std::string &, | |
371 | char **, int) override; | |
372 | ||
373 | void mourn_inferior () override; | |
374 | ||
57810aa7 | 375 | bool thread_alive (ptid_t ptid) override; |
f6ac5f3d | 376 | |
a068643d | 377 | std::string pid_to_str (ptid_t) override; |
f6ac5f3d PA |
378 | }; |
379 | ||
380 | static go32_nat_target the_go32_nat_target; | |
381 | ||
382 | void | |
383 | go32_nat_target::attach (const char *args, int from_tty) | |
e49d4fa6 | 384 | { |
8a3fe4f8 | 385 | error (_("\ |
53a5351d | 386 | You cannot attach to a running program on this platform.\n\ |
8a3fe4f8 | 387 | Use the `run' command to run DJGPP programs.")); |
e49d4fa6 SS |
388 | } |
389 | ||
e49d4fa6 | 390 | static int resume_is_step; |
53a5351d | 391 | static int resume_signal = -1; |
e49d4fa6 | 392 | |
f6ac5f3d PA |
393 | void |
394 | go32_nat_target::resume (ptid_t ptid, int step, enum gdb_signal siggnal) | |
c5aa993b | 395 | { |
53a5351d JM |
396 | int i; |
397 | ||
c5aa993b | 398 | resume_is_step = step; |
53a5351d | 399 | |
a493e3e2 | 400 | if (siggnal != GDB_SIGNAL_0 && siggnal != GDB_SIGNAL_TRAP) |
01add95b SM |
401 | { |
402 | for (i = 0, resume_signal = -1; | |
403 | excepn_map[i].gdb_sig != GDB_SIGNAL_LAST; i++) | |
404 | if (excepn_map[i].gdb_sig == siggnal) | |
405 | { | |
406 | resume_signal = excepn_map[i].djgpp_excepno; | |
407 | break; | |
408 | } | |
409 | if (resume_signal == -1) | |
410 | printf_unfiltered ("Cannot deliver signal %s on this platform.\n", | |
411 | gdb_signal_to_name (siggnal)); | |
412 | } | |
c5aa993b | 413 | } |
e49d4fa6 | 414 | |
53a5351d JM |
415 | static char child_cwd[FILENAME_MAX]; |
416 | ||
f6ac5f3d PA |
417 | ptid_t |
418 | go32_nat_target::wait (ptid_t ptid, struct target_waitstatus *status, | |
b60cea74 | 419 | target_wait_flags options) |
e49d4fa6 SS |
420 | { |
421 | int i; | |
53a5351d | 422 | unsigned char saved_opcode; |
0fff5247 | 423 | unsigned long INT3_addr = 0; |
53a5351d | 424 | int stepping_over_INT = 0; |
e49d4fa6 | 425 | |
0963b4bd | 426 | a_tss.tss_eflags &= 0xfeff; /* Reset the single-step flag (TF). */ |
e49d4fa6 | 427 | if (resume_is_step) |
53a5351d JM |
428 | { |
429 | /* If the next instruction is INT xx or INTO, we need to handle | |
430 | them specially. Intel manuals say that these instructions | |
431 | reset the single-step flag (a.k.a. TF). However, it seems | |
432 | that, at least in the DPMI environment, and at least when | |
433 | stepping over the DPMI interrupt 31h, the problem is having | |
434 | TF set at all when INT 31h is executed: the debuggee either | |
435 | crashes (and takes the system with it) or is killed by a | |
436 | SIGTRAP. | |
437 | ||
438 | So we need to emulate single-step mode: we put an INT3 opcode | |
439 | right after the INT xx instruction, let the debuggee run | |
440 | until it hits INT3 and stops, then restore the original | |
441 | instruction which we overwrote with the INT3 opcode, and back | |
442 | up the debuggee's EIP to that instruction. */ | |
443 | read_child (a_tss.tss_eip, &saved_opcode, 1); | |
444 | if (saved_opcode == 0xCD || saved_opcode == 0xCE) | |
445 | { | |
446 | unsigned char INT3_opcode = 0xCC; | |
447 | ||
448 | INT3_addr | |
449 | = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1; | |
450 | stepping_over_INT = 1; | |
451 | read_child (INT3_addr, &saved_opcode, 1); | |
452 | write_child (INT3_addr, &INT3_opcode, 1); | |
453 | } | |
454 | else | |
455 | a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */ | |
456 | } | |
457 | ||
458 | /* The special value FFFFh in tss_trap indicates to run_child that | |
459 | tss_irqn holds a signal to be delivered to the debuggee. */ | |
460 | if (resume_signal <= -1) | |
461 | { | |
462 | a_tss.tss_trap = 0; | |
463 | a_tss.tss_irqn = 0xff; | |
464 | } | |
e49d4fa6 | 465 | else |
53a5351d | 466 | { |
0963b4bd | 467 | a_tss.tss_trap = 0xffff; /* run_child looks for this. */ |
53a5351d JM |
468 | a_tss.tss_irqn = resume_signal; |
469 | } | |
470 | ||
471 | /* The child might change working directory behind our back. The | |
472 | GDB users won't like the side effects of that when they work with | |
473 | relative file names, and GDB might be confused by its current | |
474 | directory not being in sync with the truth. So we always make a | |
475 | point of changing back to where GDB thinks is its cwd, when we | |
476 | return control to the debugger, but restore child's cwd before we | |
477 | run it. */ | |
3a45aed8 EZ |
478 | /* Initialize child_cwd, before the first call to run_child and not |
479 | in the initialization, so the child get also the changed directory | |
0963b4bd | 480 | set with the gdb-command "cd ..." */ |
3a45aed8 EZ |
481 | if (!*child_cwd) |
482 | /* Initialize child's cwd with the current one. */ | |
483 | getcwd (child_cwd, sizeof (child_cwd)); | |
4d277981 | 484 | |
53a5351d | 485 | chdir (child_cwd); |
e49d4fa6 | 486 | |
b83266a0 | 487 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 488 | load_npx (); |
b83266a0 | 489 | #endif |
e49d4fa6 | 490 | run_child (); |
b83266a0 | 491 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 492 | save_npx (); |
b83266a0 | 493 | #endif |
e49d4fa6 | 494 | |
53a5351d JM |
495 | /* Did we step over an INT xx instruction? */ |
496 | if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1) | |
497 | { | |
498 | /* Restore the original opcode. */ | |
0963b4bd | 499 | a_tss.tss_eip--; /* EIP points *after* the INT3 instruction. */ |
53a5351d JM |
500 | write_child (a_tss.tss_eip, &saved_opcode, 1); |
501 | /* Simulate a TRAP exception. */ | |
502 | a_tss.tss_irqn = 1; | |
503 | a_tss.tss_eflags |= 0x0100; | |
504 | } | |
505 | ||
506 | getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */ | |
ff8577f6 SDJ |
507 | if (current_directory != NULL) |
508 | chdir (current_directory); | |
53a5351d | 509 | |
e49d4fa6 | 510 | if (a_tss.tss_irqn == 0x21) |
183be222 | 511 | status->set_exited (a_tss.tss_eax & 0xff); |
e49d4fa6 SS |
512 | else |
513 | { | |
183be222 | 514 | status->set_stopped (GDB_SIGNAL_UNKNOWN); |
e49d4fa6 SS |
515 | for (i = 0; sig_map[i].go32_sig != -1; i++) |
516 | { | |
517 | if (a_tss.tss_irqn == sig_map[i].go32_sig) | |
518 | { | |
53a5351d | 519 | #if __DJGPP_MINOR__ < 3 |
183be222 SM |
520 | status->set_stopped (sig_map[i].gdb_sig); |
521 | if (status->sig () != GDB_SIGNAL_TRAP) | |
522 | status->set_signalled (status->sig ()); | |
53a5351d | 523 | #else |
183be222 | 524 | status->set_stopped (sig_map[i].gdb_sig); |
53a5351d | 525 | #endif |
e49d4fa6 SS |
526 | break; |
527 | } | |
528 | } | |
529 | } | |
f2907e49 | 530 | return ptid_t (SOME_PID); |
e49d4fa6 SS |
531 | } |
532 | ||
533 | static void | |
56be3814 | 534 | fetch_register (struct regcache *regcache, int regno) |
e49d4fa6 | 535 | { |
ac7936df | 536 | struct gdbarch *gdbarch = regcache->arch (); |
9d0b3624 | 537 | if (regno < gdbarch_fp0_regnum (gdbarch)) |
73e1c03f SM |
538 | regcache->raw_supply (regno, |
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_supply_fsave (regcache, regno, &npx); |
89dea5aa | 543 | else |
f34652de | 544 | internal_error (_("Invalid register no. %d in fetch_register."), regno); |
89dea5aa | 545 | } |
e49d4fa6 | 546 | |
f6ac5f3d PA |
547 | void |
548 | go32_nat_target::fetch_registers (struct regcache *regcache, int regno) | |
89dea5aa EZ |
549 | { |
550 | if (regno >= 0) | |
56be3814 | 551 | fetch_register (regcache, regno); |
89dea5aa | 552 | else |
e49d4fa6 | 553 | { |
7067c689 | 554 | for (regno = 0; |
ac7936df | 555 | regno < gdbarch_fp0_regnum (regcache->arch ()); |
7067c689 | 556 | regno++) |
56be3814 UW |
557 | fetch_register (regcache, regno); |
558 | i387_supply_fsave (regcache, -1, &npx); | |
e49d4fa6 SS |
559 | } |
560 | } | |
561 | ||
562 | static void | |
56be3814 | 563 | store_register (const struct regcache *regcache, int regno) |
e49d4fa6 | 564 | { |
ac7936df | 565 | struct gdbarch *gdbarch = regcache->arch (); |
9d0b3624 | 566 | if (regno < gdbarch_fp0_regnum (gdbarch)) |
34a79281 SM |
567 | regcache->raw_collect (regno, |
568 | (char *) &a_tss + regno_mapping[regno].tss_ofs); | |
0963b4bd MS |
569 | else if (i386_fp_regnum_p (gdbarch, regno) || i386_fpc_regnum_p (gdbarch, |
570 | regno)) | |
56be3814 | 571 | i387_collect_fsave (regcache, regno, &npx); |
e49d4fa6 | 572 | else |
f34652de | 573 | internal_error (_("Invalid register no. %d in store_register."), regno); |
e49d4fa6 SS |
574 | } |
575 | ||
f6ac5f3d PA |
576 | void |
577 | go32_nat_target::store_registers (struct regcache *regcache, int regno) | |
e49d4fa6 | 578 | { |
0fff5247 | 579 | unsigned r; |
e49d4fa6 SS |
580 | |
581 | if (regno >= 0) | |
56be3814 | 582 | store_register (regcache, regno); |
e49d4fa6 SS |
583 | else |
584 | { | |
ac7936df | 585 | for (r = 0; r < gdbarch_fp0_regnum (regcache->arch ()); r++) |
56be3814 UW |
586 | store_register (regcache, r); |
587 | i387_collect_fsave (regcache, -1, &npx); | |
e49d4fa6 SS |
588 | } |
589 | } | |
590 | ||
bd265cd0 PA |
591 | /* Const-correct version of DJGPP's write_child, which unfortunately |
592 | takes a non-const buffer pointer. */ | |
593 | ||
e49d4fa6 | 594 | static int |
bd265cd0 | 595 | my_write_child (unsigned child_addr, const void *buf, unsigned len) |
e49d4fa6 | 596 | { |
bd265cd0 PA |
597 | static void *buffer = NULL; |
598 | static unsigned buffer_len = 0; | |
599 | int res; | |
600 | ||
601 | if (buffer_len < len) | |
e49d4fa6 | 602 | { |
bd265cd0 PA |
603 | buffer = xrealloc (buffer, len); |
604 | buffer_len = len; | |
e49d4fa6 | 605 | } |
bd265cd0 PA |
606 | |
607 | memcpy (buffer, buf, len); | |
608 | res = write_child (child_addr, buffer, len); | |
609 | return res; | |
610 | } | |
611 | ||
612 | /* Helper for go32_xfer_partial that handles memory transfers. | |
613 | Arguments are like target_xfer_partial. */ | |
614 | ||
615 | static enum target_xfer_status | |
616 | go32_xfer_memory (gdb_byte *readbuf, const gdb_byte *writebuf, | |
617 | ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len) | |
618 | { | |
619 | int res; | |
620 | ||
621 | if (writebuf != NULL) | |
622 | res = my_write_child (memaddr, writebuf, len); | |
e49d4fa6 | 623 | else |
bd265cd0 PA |
624 | res = read_child (memaddr, readbuf, len); |
625 | ||
99cee7b7 EZ |
626 | /* read_child and write_child return zero on success, non-zero on |
627 | failure. */ | |
628 | if (res != 0) | |
bd265cd0 PA |
629 | return TARGET_XFER_E_IO; |
630 | ||
99cee7b7 | 631 | *xfered_len = len; |
bd265cd0 PA |
632 | return TARGET_XFER_OK; |
633 | } | |
634 | ||
635 | /* Target to_xfer_partial implementation. */ | |
636 | ||
f6ac5f3d PA |
637 | enum target_xfer_status |
638 | go32_nat_target::xfer_partial (enum target_object object, | |
639 | const char *annex, gdb_byte *readbuf, | |
640 | const gdb_byte *writebuf, ULONGEST offset, | |
641 | ULONGEST len, | |
642 | ULONGEST *xfered_len) | |
bd265cd0 PA |
643 | { |
644 | switch (object) | |
e49d4fa6 | 645 | { |
bd265cd0 PA |
646 | case TARGET_OBJECT_MEMORY: |
647 | return go32_xfer_memory (readbuf, writebuf, offset, len, xfered_len); | |
648 | ||
649 | default: | |
4360561f TT |
650 | return this->beneath ()->xfer_partial (object, annex, |
651 | readbuf, writebuf, offset, len, | |
652 | xfered_len); | |
e49d4fa6 SS |
653 | } |
654 | } | |
655 | ||
0963b4bd | 656 | static cmdline_t child_cmd; /* Parsed child's command line kept here. */ |
53a5351d | 657 | |
f6ac5f3d PA |
658 | void |
659 | go32_nat_target::files_info () | |
e49d4fa6 | 660 | { |
6cb06a8c | 661 | gdb_printf ("You are running a DJGPP V2 program.\n"); |
e49d4fa6 SS |
662 | } |
663 | ||
f6ac5f3d PA |
664 | void |
665 | go32_nat_target::kill_inferior () | |
e49d4fa6 | 666 | { |
f6ac5f3d | 667 | mourn_inferior (); |
e49d4fa6 SS |
668 | } |
669 | ||
f6ac5f3d PA |
670 | void |
671 | go32_nat_target::create_inferior (const char *exec_file, | |
672 | const std::string &allargs, | |
673 | char **env, int from_tty) | |
e49d4fa6 | 674 | { |
4d277981 | 675 | extern char **environ; |
e49d4fa6 SS |
676 | jmp_buf start_state; |
677 | char *cmdline; | |
678 | char **env_save = environ; | |
150985e3 | 679 | size_t cmdlen; |
6c95b8df | 680 | struct inferior *inf; |
b1ec390e | 681 | int result; |
7c5ded6a | 682 | const char *args = allargs.c_str (); |
e49d4fa6 | 683 | |
0fff5247 EZ |
684 | /* If no exec file handed to us, get it from the exec-file command -- with |
685 | a good, common error message if none is specified. */ | |
686 | if (exec_file == 0) | |
687 | exec_file = get_exec_file (1); | |
688 | ||
53a5351d JM |
689 | resume_signal = -1; |
690 | resume_is_step = 0; | |
3a45aed8 EZ |
691 | |
692 | /* Initialize child's cwd as empty to be initialized when starting | |
693 | the child. */ | |
694 | *child_cwd = 0; | |
695 | ||
53a5351d JM |
696 | /* Init command line storage. */ |
697 | if (redir_debug_init (&child_cmd) == -1) | |
f34652de | 698 | internal_error (_("Cannot allocate redirection storage: " |
0963b4bd | 699 | "not enough memory.\n")); |
53a5351d JM |
700 | |
701 | /* Parse the command line and create redirections. */ | |
702 | if (strpbrk (args, "<>")) | |
703 | { | |
704 | if (redir_cmdline_parse (args, &child_cmd) == 0) | |
705 | args = child_cmd.command; | |
706 | else | |
8a3fe4f8 | 707 | error (_("Syntax error in command line.")); |
53a5351d JM |
708 | } |
709 | else | |
c2d11a7d | 710 | child_cmd.command = xstrdup (args); |
e49d4fa6 | 711 | |
150985e3 EZ |
712 | cmdlen = strlen (args); |
713 | /* v2loadimage passes command lines via DOS memory, so it cannot | |
714 | possibly handle commands longer than 1MB. */ | |
715 | if (cmdlen > 1024*1024) | |
8a3fe4f8 | 716 | error (_("Command line too long.")); |
150985e3 | 717 | |
f515a1d6 | 718 | cmdline = (char *) xmalloc (cmdlen + 4); |
e49d4fa6 | 719 | strcpy (cmdline + 1, args); |
150985e3 EZ |
720 | /* If the command-line length fits into DOS 126-char limits, use the |
721 | DOS command tail format; otherwise, tell v2loadimage to pass it | |
722 | through a buffer in conventional memory. */ | |
723 | if (cmdlen < 127) | |
724 | { | |
725 | cmdline[0] = strlen (args); | |
726 | cmdline[cmdlen + 1] = 13; | |
727 | } | |
728 | else | |
0963b4bd | 729 | cmdline[0] = 0xff; /* Signal v2loadimage it's a long command. */ |
e49d4fa6 SS |
730 | |
731 | environ = env; | |
732 | ||
b1ec390e GB |
733 | result = v2loadimage (exec_file, cmdline, start_state); |
734 | ||
e49d4fa6 | 735 | environ = env_save; |
12a498f3 | 736 | xfree (cmdline); |
e49d4fa6 | 737 | |
b1ec390e | 738 | if (result != 0) |
1ada499f | 739 | error (_("Load failed for image %s"), exec_file); |
b1ec390e | 740 | |
e49d4fa6 | 741 | edi_init (start_state); |
53a5351d JM |
742 | #if __DJGPP_MINOR__ < 3 |
743 | save_npx (); | |
744 | #endif | |
e49d4fa6 | 745 | |
6c95b8df | 746 | inf = current_inferior (); |
20176d8f | 747 | inferior_appeared (inf, SOME_PID); |
7f9f62ba | 748 | |
c8fbd44a | 749 | if (!inf->target_is_pushed (this)) |
02980c56 | 750 | inf->push_target (this); |
444c3224 | 751 | |
1ee1a363 PA |
752 | thread_info *thr = add_thread_silent (ptid_t (SOME_PID)); |
753 | switch_to_thread (thr); | |
444c3224 | 754 | |
88056fbb | 755 | clear_proceed_status (0); |
e49d4fa6 | 756 | insert_breakpoints (); |
b83266a0 | 757 | prog_has_started = 1; |
e49d4fa6 SS |
758 | } |
759 | ||
f6ac5f3d PA |
760 | void |
761 | go32_nat_target::mourn_inferior () | |
e49d4fa6 | 762 | { |
67ce33d7 PA |
763 | redir_cmdline_delete (&child_cmd); |
764 | resume_signal = -1; | |
765 | resume_is_step = 0; | |
766 | ||
767 | cleanup_client (); | |
768 | ||
53a5351d JM |
769 | /* We need to make sure all the breakpoint enable bits in the DR7 |
770 | register are reset when the inferior exits. Otherwise, if they | |
771 | rerun the inferior, the uncleared bits may cause random SIGTRAPs, | |
772 | failure to set more watchpoints, and other calamities. It would | |
773 | be nice if GDB itself would take care to remove all breakpoints | |
774 | at all times, but it doesn't, probably under an assumption that | |
775 | the OS cleans up when the debuggee exits. */ | |
df7e5265 | 776 | x86_cleanup_dregs (); |
67ce33d7 | 777 | |
67ce33d7 PA |
778 | prog_has_started = 0; |
779 | ||
e49d4fa6 | 780 | generic_mourn_inferior (); |
f6ac5f3d | 781 | maybe_unpush_target (); |
e49d4fa6 SS |
782 | } |
783 | ||
e49d4fa6 SS |
784 | /* Hardware watchpoint support. */ |
785 | ||
e49d4fa6 | 786 | #define D_REGS edi.dr |
e24d4c64 EZ |
787 | #define CONTROL D_REGS[7] |
788 | #define STATUS D_REGS[6] | |
53a5351d | 789 | |
e24d4c64 EZ |
790 | /* Pass the address ADDR to the inferior in the I'th debug register. |
791 | Here we just store the address in D_REGS, the watchpoint will be | |
792 | actually set up when go32_wait runs the debuggee. */ | |
9bb9e8ad | 793 | static void |
e24d4c64 | 794 | go32_set_dr (int i, CORE_ADDR addr) |
e49d4fa6 | 795 | { |
4d277981 | 796 | if (i < 0 || i > 3) |
f34652de | 797 | internal_error (_("Invalid register %d in go32_set_dr.\n"), i); |
e24d4c64 | 798 | D_REGS[i] = addr; |
e49d4fa6 SS |
799 | } |
800 | ||
e24d4c64 EZ |
801 | /* Pass the value VAL to the inferior in the DR7 debug control |
802 | register. Here we just store the address in D_REGS, the watchpoint | |
803 | will be actually set up when go32_wait runs the debuggee. */ | |
9bb9e8ad PM |
804 | static void |
805 | go32_set_dr7 (unsigned long val) | |
53a5351d | 806 | { |
e24d4c64 | 807 | CONTROL = val; |
53a5351d JM |
808 | } |
809 | ||
e24d4c64 EZ |
810 | /* Get the value of the DR6 debug status register from the inferior. |
811 | Here we just return the value stored in D_REGS, as we've got it | |
812 | from the last go32_wait call. */ | |
9bb9e8ad | 813 | static unsigned long |
e24d4c64 | 814 | go32_get_dr6 (void) |
e49d4fa6 | 815 | { |
e24d4c64 | 816 | return STATUS; |
e49d4fa6 SS |
817 | } |
818 | ||
7b50312a PA |
819 | /* Get the value of the DR7 debug status register from the inferior. |
820 | Here we just return the value stored in D_REGS, as we've got it | |
821 | from the last go32_wait call. */ | |
822 | ||
823 | static unsigned long | |
824 | go32_get_dr7 (void) | |
825 | { | |
826 | return CONTROL; | |
827 | } | |
828 | ||
829 | /* Get the value of the DR debug register I from the inferior. Here | |
830 | we just return the value stored in D_REGS, as we've got it from the | |
831 | last go32_wait call. */ | |
832 | ||
833 | static CORE_ADDR | |
834 | go32_get_dr (int i) | |
835 | { | |
836 | if (i < 0 || i > 3) | |
f34652de | 837 | internal_error (_("Invalid register %d in go32_get_dr.\n"), i); |
7b50312a PA |
838 | return D_REGS[i]; |
839 | } | |
840 | ||
53a5351d JM |
841 | /* Put the device open on handle FD into either raw or cooked |
842 | mode, return 1 if it was in raw mode, zero otherwise. */ | |
843 | ||
844 | static int | |
845 | device_mode (int fd, int raw_p) | |
846 | { | |
847 | int oldmode, newmode; | |
848 | __dpmi_regs regs; | |
849 | ||
850 | regs.x.ax = 0x4400; | |
851 | regs.x.bx = fd; | |
852 | __dpmi_int (0x21, ®s); | |
853 | if (regs.x.flags & 1) | |
854 | return -1; | |
855 | newmode = oldmode = regs.x.dx; | |
856 | ||
857 | if (raw_p) | |
858 | newmode |= 0x20; | |
859 | else | |
860 | newmode &= ~0x20; | |
861 | ||
0963b4bd | 862 | if (oldmode & 0x80) /* Only for character dev. */ |
01add95b SM |
863 | { |
864 | regs.x.ax = 0x4401; | |
865 | regs.x.bx = fd; | |
866 | regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails. */ | |
867 | __dpmi_int (0x21, ®s); | |
868 | if (regs.x.flags & 1) | |
869 | return -1; | |
870 | } | |
53a5351d JM |
871 | return (oldmode & 0x20) == 0x20; |
872 | } | |
873 | ||
874 | ||
875 | static int inf_mode_valid = 0; | |
876 | static int inf_terminal_mode; | |
877 | ||
878 | /* This semaphore is needed because, amazingly enough, GDB calls | |
879 | target.to_terminal_ours more than once after the inferior stops. | |
880 | But we need the information from the first call only, since the | |
881 | second call will always see GDB's own cooked terminal. */ | |
882 | static int terminal_is_ours = 1; | |
883 | ||
f6ac5f3d PA |
884 | void |
885 | go32_nat_target::terminal_init () | |
cce74817 | 886 | { |
0963b4bd | 887 | inf_mode_valid = 0; /* Reinitialize, in case they are restarting child. */ |
53a5351d | 888 | terminal_is_ours = 1; |
cce74817 JM |
889 | } |
890 | ||
f6ac5f3d PA |
891 | void |
892 | go32_nat_target::terminal_info (const char *args, int from_tty) | |
cce74817 | 893 | { |
6cb06a8c TT |
894 | gdb_printf ("Inferior's terminal is in %s mode.\n", |
895 | !inf_mode_valid | |
896 | ? "default" : inf_terminal_mode ? "raw" : "cooked"); | |
53a5351d JM |
897 | |
898 | #if __DJGPP_MINOR__ > 2 | |
899 | if (child_cmd.redirection) | |
c5aa993b | 900 | { |
01add95b SM |
901 | int i; |
902 | ||
903 | for (i = 0; i < DBG_HANDLES; i++) | |
904 | { | |
905 | if (child_cmd.redirection[i]->file_name) | |
6cb06a8c TT |
906 | gdb_printf ("\tFile handle %d is redirected to `%s'.\n", |
907 | i, child_cmd.redirection[i]->file_name); | |
01add95b | 908 | else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1) |
6cb06a8c | 909 | gdb_printf |
01add95b SM |
910 | ("\tFile handle %d appears to be closed by inferior.\n", i); |
911 | /* Mask off the raw/cooked bit when comparing device info words. */ | |
912 | else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf) | |
913 | != (_get_dev_info (i) & 0xdf)) | |
6cb06a8c | 914 | gdb_printf |
01add95b SM |
915 | ("\tFile handle %d appears to be redirected by inferior.\n", i); |
916 | } | |
c5aa993b | 917 | } |
53a5351d JM |
918 | #endif |
919 | } | |
920 | ||
f6ac5f3d PA |
921 | void |
922 | go32_nat_target::terminal_inferior () | |
53a5351d JM |
923 | { |
924 | /* Redirect standard handles as child wants them. */ | |
925 | errno = 0; | |
926 | if (redir_to_child (&child_cmd) == -1) | |
01add95b SM |
927 | { |
928 | redir_to_debugger (&child_cmd); | |
929 | error (_("Cannot redirect standard handles for program: %s."), | |
930 | safe_strerror (errno)); | |
931 | } | |
0963b4bd MS |
932 | /* Set the console device of the inferior to whatever mode |
933 | (raw or cooked) we found it last time. */ | |
53a5351d | 934 | if (terminal_is_ours) |
01add95b SM |
935 | { |
936 | if (inf_mode_valid) | |
937 | device_mode (0, inf_terminal_mode); | |
938 | terminal_is_ours = 0; | |
939 | } | |
cce74817 JM |
940 | } |
941 | ||
f6ac5f3d PA |
942 | void |
943 | go32_nat_target::terminal_ours () | |
cce74817 | 944 | { |
53a5351d | 945 | /* Switch to cooked mode on the gdb terminal and save the inferior |
0963b4bd | 946 | terminal mode to be restored when it is resumed. */ |
53a5351d | 947 | if (!terminal_is_ours) |
53a5351d | 948 | { |
01add95b SM |
949 | inf_terminal_mode = device_mode (0, 0); |
950 | if (inf_terminal_mode != -1) | |
951 | inf_mode_valid = 1; | |
952 | else | |
953 | /* If device_mode returned -1, we don't know what happens with | |
954 | handle 0 anymore, so make the info invalid. */ | |
955 | inf_mode_valid = 0; | |
956 | terminal_is_ours = 1; | |
957 | ||
958 | /* Restore debugger's standard handles. */ | |
959 | errno = 0; | |
960 | if (redir_to_debugger (&child_cmd) == -1) | |
961 | { | |
962 | redir_to_child (&child_cmd); | |
963 | error (_("Cannot redirect standard handles for debugger: %s."), | |
964 | safe_strerror (errno)); | |
965 | } | |
53a5351d | 966 | } |
cce74817 JM |
967 | } |
968 | ||
f6ac5f3d PA |
969 | void |
970 | go32_nat_target::pass_ctrlc () | |
e671cd59 PA |
971 | { |
972 | } | |
973 | ||
57810aa7 | 974 | bool |
f6ac5f3d | 975 | go32_nat_target::thread_alive (ptid_t ptid) |
444c3224 | 976 | { |
d7e15655 | 977 | return ptid != null_ptid; |
444c3224 PA |
978 | } |
979 | ||
a068643d | 980 | std::string |
f6ac5f3d | 981 | go32_nat_target::pid_to_str (ptid_t ptid) |
444c3224 | 982 | { |
89c9c2ec | 983 | return normal_pid_to_str (ptid); |
444c3224 PA |
984 | } |
985 | ||
10085bb5 EZ |
986 | /* Return the current DOS codepage number. */ |
987 | static int | |
988 | dos_codepage (void) | |
989 | { | |
990 | __dpmi_regs regs; | |
991 | ||
992 | regs.x.ax = 0x6601; | |
993 | __dpmi_int (0x21, ®s); | |
994 | if (!(regs.x.flags & 1)) | |
995 | return regs.x.bx & 0xffff; | |
996 | else | |
997 | return 437; /* default */ | |
998 | } | |
999 | ||
1000 | /* Limited emulation of `nl_langinfo', for charset.c. */ | |
1001 | char * | |
1002 | nl_langinfo (nl_item item) | |
1003 | { | |
1004 | char *retval; | |
1005 | ||
1006 | switch (item) | |
1007 | { | |
1008 | case CODESET: | |
1009 | { | |
1010 | /* 8 is enough for SHORT_MAX + "CP" + null. */ | |
1011 | char buf[8]; | |
1012 | int blen = sizeof (buf); | |
1013 | int needed = snprintf (buf, blen, "CP%d", dos_codepage ()); | |
1014 | ||
0963b4bd | 1015 | if (needed > blen) /* Should never happen. */ |
10085bb5 EZ |
1016 | buf[0] = 0; |
1017 | retval = xstrdup (buf); | |
1018 | } | |
1019 | break; | |
1020 | default: | |
1021 | retval = xstrdup (""); | |
1022 | break; | |
1023 | } | |
1024 | return retval; | |
1025 | } | |
1026 | ||
10ba702d EZ |
1027 | unsigned short windows_major, windows_minor; |
1028 | ||
1029 | /* Compute the version Windows reports via Int 2Fh/AX=1600h. */ | |
1030 | static void | |
1031 | go32_get_windows_version(void) | |
1032 | { | |
1033 | __dpmi_regs r; | |
1034 | ||
1035 | r.x.ax = 0x1600; | |
1036 | __dpmi_int(0x2f, &r); | |
1037 | if (r.h.al > 2 && r.h.al != 0x80 && r.h.al != 0xff | |
1038 | && (r.h.al > 3 || r.h.ah > 0)) | |
1039 | { | |
1040 | windows_major = r.h.al; | |
1041 | windows_minor = r.h.ah; | |
1042 | } | |
1043 | else | |
1044 | windows_major = 0xff; /* meaning no Windows */ | |
1045 | } | |
1046 | ||
1047 | /* A subroutine of go32_sysinfo to display memory info. */ | |
1048 | static void | |
1049 | print_mem (unsigned long datum, const char *header, int in_pages_p) | |
1050 | { | |
1051 | if (datum != 0xffffffffUL) | |
1052 | { | |
1053 | if (in_pages_p) | |
1054 | datum <<= 12; | |
0426ad51 | 1055 | gdb_puts (header); |
10ba702d EZ |
1056 | if (datum > 1024) |
1057 | { | |
6cb06a8c | 1058 | gdb_printf ("%lu KB", datum >> 10); |
10ba702d | 1059 | if (datum > 1024 * 1024) |
6cb06a8c | 1060 | gdb_printf (" (%lu MB)", datum >> 20); |
10ba702d EZ |
1061 | } |
1062 | else | |
6cb06a8c | 1063 | gdb_printf ("%lu Bytes", datum); |
0426ad51 | 1064 | gdb_puts ("\n"); |
10ba702d EZ |
1065 | } |
1066 | } | |
1067 | ||
1068 | /* Display assorted information about the underlying OS. */ | |
1069 | static void | |
5fed81ff | 1070 | go32_sysinfo (const char *arg, int from_tty) |
10ba702d | 1071 | { |
d647eed6 EZ |
1072 | static const char test_pattern[] = |
1073 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf" | |
1074 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf" | |
1075 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeafdeadbeaf"; | |
10ba702d EZ |
1076 | struct utsname u; |
1077 | char cpuid_vendor[13]; | |
1078 | unsigned cpuid_max = 0, cpuid_eax, cpuid_ebx, cpuid_ecx, cpuid_edx; | |
1079 | unsigned true_dos_version = _get_dos_version (1); | |
1080 | unsigned advertized_dos_version = ((unsigned int)_osmajor << 8) | _osminor; | |
1081 | int dpmi_flags; | |
1082 | char dpmi_vendor_info[129]; | |
d647eed6 | 1083 | int dpmi_vendor_available; |
10ba702d EZ |
1084 | __dpmi_version_ret dpmi_version_data; |
1085 | long eflags; | |
1086 | __dpmi_free_mem_info mem_info; | |
1087 | __dpmi_regs regs; | |
1088 | ||
1089 | cpuid_vendor[0] = '\0'; | |
1090 | if (uname (&u)) | |
1091 | strcpy (u.machine, "Unknown x86"); | |
1092 | else if (u.machine[0] == 'i' && u.machine[1] > 4) | |
1093 | { | |
1094 | /* CPUID with EAX = 0 returns the Vendor ID. */ | |
4d157a3d | 1095 | #if 0 |
df7e5265 | 1096 | /* Ideally we would use x86_cpuid(), but it needs someone to run |
dda83cd7 SM |
1097 | native tests first to make sure things actually work. They should. |
1098 | http://sourceware.org/ml/gdb-patches/2013-05/msg00164.html */ | |
4d157a3d MF |
1099 | unsigned int eax, ebx, ecx, edx; |
1100 | ||
df7e5265 | 1101 | if (x86_cpuid (0, &eax, &ebx, &ecx, &edx)) |
4d157a3d MF |
1102 | { |
1103 | cpuid_max = eax; | |
1104 | memcpy (&vendor[0], &ebx, 4); | |
1105 | memcpy (&vendor[4], &ecx, 4); | |
1106 | memcpy (&vendor[8], &edx, 4); | |
1107 | cpuid_vendor[12] = '\0'; | |
1108 | } | |
1109 | #else | |
10ba702d EZ |
1110 | __asm__ __volatile__ ("xorl %%ebx, %%ebx;" |
1111 | "xorl %%ecx, %%ecx;" | |
1112 | "xorl %%edx, %%edx;" | |
1113 | "movl $0, %%eax;" | |
1114 | "cpuid;" | |
1115 | "movl %%ebx, %0;" | |
1116 | "movl %%edx, %1;" | |
1117 | "movl %%ecx, %2;" | |
1118 | "movl %%eax, %3;" | |
1119 | : "=m" (cpuid_vendor[0]), | |
1120 | "=m" (cpuid_vendor[4]), | |
1121 | "=m" (cpuid_vendor[8]), | |
1122 | "=m" (cpuid_max) | |
1123 | : | |
1124 | : "%eax", "%ebx", "%ecx", "%edx"); | |
1125 | cpuid_vendor[12] = '\0'; | |
4d157a3d | 1126 | #endif |
10ba702d EZ |
1127 | } |
1128 | ||
6cb06a8c | 1129 | gdb_printf ("CPU Type.......................%s", u.machine); |
10ba702d | 1130 | if (cpuid_vendor[0]) |
6cb06a8c | 1131 | gdb_printf (" (%s)", cpuid_vendor); |
0426ad51 | 1132 | gdb_puts ("\n"); |
10ba702d EZ |
1133 | |
1134 | /* CPUID with EAX = 1 returns processor signature and features. */ | |
1135 | if (cpuid_max >= 1) | |
1136 | { | |
a121b7c1 | 1137 | static const char *brand_name[] = { |
10ba702d EZ |
1138 | "", |
1139 | " Celeron", | |
1140 | " III", | |
1141 | " III Xeon", | |
1142 | "", "", "", "", | |
1143 | " 4" | |
1144 | }; | |
1145 | char cpu_string[80]; | |
1146 | char cpu_brand[20]; | |
1147 | unsigned brand_idx; | |
1148 | int intel_p = strcmp (cpuid_vendor, "GenuineIntel") == 0; | |
1149 | int amd_p = strcmp (cpuid_vendor, "AuthenticAMD") == 0; | |
3960cb7a | 1150 | int hygon_p = strcmp (cpuid_vendor, "HygonGenuine") == 0; |
10ba702d EZ |
1151 | unsigned cpu_family, cpu_model; |
1152 | ||
4d157a3d MF |
1153 | #if 0 |
1154 | /* See comment above about cpuid usage. */ | |
df7e5265 | 1155 | x86_cpuid (1, &cpuid_eax, &cpuid_ebx, NULL, &cpuid_edx); |
4d157a3d | 1156 | #else |
10ba702d EZ |
1157 | __asm__ __volatile__ ("movl $1, %%eax;" |
1158 | "cpuid;" | |
1159 | : "=a" (cpuid_eax), | |
1160 | "=b" (cpuid_ebx), | |
1161 | "=d" (cpuid_edx) | |
1162 | : | |
1163 | : "%ecx"); | |
4d157a3d | 1164 | #endif |
10ba702d EZ |
1165 | brand_idx = cpuid_ebx & 0xff; |
1166 | cpu_family = (cpuid_eax >> 8) & 0xf; | |
1167 | cpu_model = (cpuid_eax >> 4) & 0xf; | |
1168 | cpu_brand[0] = '\0'; | |
1169 | if (intel_p) | |
1170 | { | |
1171 | if (brand_idx > 0 | |
1172 | && brand_idx < sizeof(brand_name)/sizeof(brand_name[0]) | |
1173 | && *brand_name[brand_idx]) | |
1174 | strcpy (cpu_brand, brand_name[brand_idx]); | |
1175 | else if (cpu_family == 5) | |
1176 | { | |
1177 | if (((cpuid_eax >> 12) & 3) == 0 && cpu_model == 4) | |
1178 | strcpy (cpu_brand, " MMX"); | |
1179 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 1) | |
1180 | strcpy (cpu_brand, " OverDrive"); | |
1181 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 2) | |
1182 | strcpy (cpu_brand, " Dual"); | |
1183 | } | |
1184 | else if (cpu_family == 6 && cpu_model < 8) | |
1185 | { | |
1186 | switch (cpu_model) | |
1187 | { | |
1188 | case 1: | |
1189 | strcpy (cpu_brand, " Pro"); | |
1190 | break; | |
1191 | case 3: | |
1192 | strcpy (cpu_brand, " II"); | |
1193 | break; | |
1194 | case 5: | |
1195 | strcpy (cpu_brand, " II Xeon"); | |
1196 | break; | |
1197 | case 6: | |
1198 | strcpy (cpu_brand, " Celeron"); | |
1199 | break; | |
1200 | case 7: | |
1201 | strcpy (cpu_brand, " III"); | |
1202 | break; | |
1203 | } | |
1204 | } | |
1205 | } | |
1206 | else if (amd_p) | |
1207 | { | |
1208 | switch (cpu_family) | |
1209 | { | |
1210 | case 4: | |
1211 | strcpy (cpu_brand, "486/5x86"); | |
1212 | break; | |
1213 | case 5: | |
1214 | switch (cpu_model) | |
1215 | { | |
1216 | case 0: | |
1217 | case 1: | |
1218 | case 2: | |
1219 | case 3: | |
1220 | strcpy (cpu_brand, "-K5"); | |
1221 | break; | |
1222 | case 6: | |
1223 | case 7: | |
1224 | strcpy (cpu_brand, "-K6"); | |
1225 | break; | |
1226 | case 8: | |
1227 | strcpy (cpu_brand, "-K6-2"); | |
1228 | break; | |
1229 | case 9: | |
1230 | strcpy (cpu_brand, "-K6-III"); | |
1231 | break; | |
1232 | } | |
1233 | break; | |
1234 | case 6: | |
1235 | switch (cpu_model) | |
1236 | { | |
1237 | case 1: | |
1238 | case 2: | |
1239 | case 4: | |
1240 | strcpy (cpu_brand, " Athlon"); | |
1241 | break; | |
1242 | case 3: | |
1243 | strcpy (cpu_brand, " Duron"); | |
1244 | break; | |
1245 | } | |
1246 | break; | |
1247 | } | |
1248 | } | |
8c042590 | 1249 | xsnprintf (cpu_string, sizeof (cpu_string), "%s%s Model %d Stepping %d", |
dda83cd7 SM |
1250 | intel_p ? "Pentium" : (amd_p ? "AMD" : (hygon_p ? "Hygon" : "ix86")), |
1251 | cpu_brand, cpu_model, cpuid_eax & 0xf); | |
6cb06a8c | 1252 | gdb_printf ("%*s%s\n", 31, "", cpu_string); |
10ba702d EZ |
1253 | if (((cpuid_edx & (6 | (0x0d << 23))) != 0) |
1254 | || ((cpuid_edx & 1) == 0) | |
3960cb7a | 1255 | || ((amd_p || hygon_p) && (cpuid_edx & (3 << 30)) != 0)) |
10ba702d | 1256 | { |
0426ad51 | 1257 | gdb_puts ("CPU Features..................."); |
10ba702d EZ |
1258 | /* We only list features which might be useful in the DPMI |
1259 | environment. */ | |
1260 | if ((cpuid_edx & 1) == 0) | |
0426ad51 | 1261 | gdb_puts ("No FPU "); /* It's unusual to not have an FPU. */ |
10ba702d | 1262 | if ((cpuid_edx & (1 << 1)) != 0) |
0426ad51 | 1263 | gdb_puts ("VME "); |
10ba702d | 1264 | if ((cpuid_edx & (1 << 2)) != 0) |
0426ad51 | 1265 | gdb_puts ("DE "); |
10ba702d | 1266 | if ((cpuid_edx & (1 << 4)) != 0) |
0426ad51 | 1267 | gdb_puts ("TSC "); |
10ba702d | 1268 | if ((cpuid_edx & (1 << 23)) != 0) |
0426ad51 | 1269 | gdb_puts ("MMX "); |
10ba702d | 1270 | if ((cpuid_edx & (1 << 25)) != 0) |
0426ad51 | 1271 | gdb_puts ("SSE "); |
10ba702d | 1272 | if ((cpuid_edx & (1 << 26)) != 0) |
0426ad51 | 1273 | gdb_puts ("SSE2 "); |
3960cb7a | 1274 | if (amd_p || hygon_p) |
10ba702d EZ |
1275 | { |
1276 | if ((cpuid_edx & (1 << 31)) != 0) | |
0426ad51 | 1277 | gdb_puts ("3DNow! "); |
10ba702d | 1278 | if ((cpuid_edx & (1 << 30)) != 0) |
0426ad51 | 1279 | gdb_puts ("3DNow!Ext"); |
10ba702d | 1280 | } |
0426ad51 | 1281 | gdb_puts ("\n"); |
10ba702d EZ |
1282 | } |
1283 | } | |
0426ad51 | 1284 | gdb_puts ("\n"); |
6cb06a8c TT |
1285 | gdb_printf ("DOS Version....................%s %s.%s", |
1286 | _os_flavor, u.release, u.version); | |
10ba702d | 1287 | if (true_dos_version != advertized_dos_version) |
6cb06a8c | 1288 | gdb_printf (" (disguised as v%d.%d)", _osmajor, _osminor); |
0426ad51 | 1289 | gdb_puts ("\n"); |
10ba702d EZ |
1290 | if (!windows_major) |
1291 | go32_get_windows_version (); | |
1292 | if (windows_major != 0xff) | |
1293 | { | |
1294 | const char *windows_flavor; | |
1295 | ||
6cb06a8c TT |
1296 | gdb_printf ("Windows Version................%d.%02d (Windows ", |
1297 | windows_major, windows_minor); | |
10ba702d EZ |
1298 | switch (windows_major) |
1299 | { | |
1300 | case 3: | |
1301 | windows_flavor = "3.X"; | |
1302 | break; | |
1303 | case 4: | |
1304 | switch (windows_minor) | |
1305 | { | |
1306 | case 0: | |
1307 | windows_flavor = "95, 95A, or 95B"; | |
1308 | break; | |
1309 | case 3: | |
1310 | windows_flavor = "95B OSR2.1 or 95C OSR2.5"; | |
1311 | break; | |
1312 | case 10: | |
1313 | windows_flavor = "98 or 98 SE"; | |
1314 | break; | |
1315 | case 90: | |
1316 | windows_flavor = "ME"; | |
1317 | break; | |
1318 | default: | |
1319 | windows_flavor = "9X"; | |
1320 | break; | |
1321 | } | |
1322 | break; | |
1323 | default: | |
1324 | windows_flavor = "??"; | |
1325 | break; | |
1326 | } | |
6cb06a8c | 1327 | gdb_printf ("%s)\n", windows_flavor); |
10ba702d EZ |
1328 | } |
1329 | else if (true_dos_version == 0x532 && advertized_dos_version == 0x500) | |
6cb06a8c TT |
1330 | gdb_printf ("Windows Version................" |
1331 | "Windows NT family (W2K/XP/W2K3/Vista/W2K8)\n"); | |
0426ad51 | 1332 | gdb_puts ("\n"); |
d647eed6 EZ |
1333 | /* On some versions of Windows, __dpmi_get_capabilities returns |
1334 | zero, but the buffer is not filled with info, so we fill the | |
1335 | buffer with a known pattern and test for it afterwards. */ | |
1336 | memcpy (dpmi_vendor_info, test_pattern, sizeof(dpmi_vendor_info)); | |
1337 | dpmi_vendor_available = | |
1338 | __dpmi_get_capabilities (&dpmi_flags, dpmi_vendor_info); | |
1339 | if (dpmi_vendor_available == 0 | |
1340 | && memcmp (dpmi_vendor_info, test_pattern, | |
1341 | sizeof(dpmi_vendor_info)) != 0) | |
10ba702d EZ |
1342 | { |
1343 | /* The DPMI spec says the vendor string should be ASCIIZ, but | |
1344 | I don't trust the vendors to follow that... */ | |
1345 | if (!memchr (&dpmi_vendor_info[2], 0, 126)) | |
1346 | dpmi_vendor_info[128] = '\0'; | |
6cb06a8c TT |
1347 | gdb_printf ("DPMI Host......................" |
1348 | "%s v%d.%d (capabilities: %#x)\n", | |
1349 | &dpmi_vendor_info[2], | |
1350 | (unsigned)dpmi_vendor_info[0], | |
1351 | (unsigned)dpmi_vendor_info[1], | |
1352 | ((unsigned)dpmi_flags & 0x7f)); | |
10ba702d | 1353 | } |
d647eed6 | 1354 | else |
6cb06a8c | 1355 | gdb_printf ("DPMI Host......................(Info not available)\n"); |
10ba702d | 1356 | __dpmi_get_version (&dpmi_version_data); |
6cb06a8c TT |
1357 | gdb_printf ("DPMI Version...................%d.%02d\n", |
1358 | dpmi_version_data.major, dpmi_version_data.minor); | |
1359 | gdb_printf ("DPMI Info......................" | |
1360 | "%s-bit DPMI, with%s Virtual Memory support\n", | |
1361 | (dpmi_version_data.flags & 1) ? "32" : "16", | |
1362 | (dpmi_version_data.flags & 4) ? "" : "out"); | |
1363 | gdb_printf ("%*sInterrupts reflected to %s mode\n", 31, "", | |
1364 | (dpmi_version_data.flags & 2) ? "V86" : "Real"); | |
1365 | gdb_printf ("%*sProcessor type: i%d86\n", 31, "", | |
1366 | dpmi_version_data.cpu); | |
1367 | gdb_printf ("%*sPIC base interrupt: Master: %#x Slave: %#x\n", 31, "", | |
1368 | dpmi_version_data.master_pic, dpmi_version_data.slave_pic); | |
10ba702d EZ |
1369 | |
1370 | /* a_tss is only initialized when the debuggee is first run. */ | |
1371 | if (prog_has_started) | |
1372 | { | |
1373 | __asm__ __volatile__ ("pushfl ; popl %0" : "=g" (eflags)); | |
6cb06a8c TT |
1374 | gdb_printf ("Protection....................." |
1375 | "Ring %d (in %s), with%s I/O protection\n", | |
1376 | a_tss.tss_cs & 3, (a_tss.tss_cs & 4) ? "LDT" : "GDT", | |
1377 | (a_tss.tss_cs & 3) > ((eflags >> 12) & 3) ? "" : "out"); | |
10ba702d | 1378 | } |
0426ad51 | 1379 | gdb_puts ("\n"); |
10ba702d EZ |
1380 | __dpmi_get_free_memory_information (&mem_info); |
1381 | print_mem (mem_info.total_number_of_physical_pages, | |
1382 | "DPMI Total Physical Memory.....", 1); | |
1383 | print_mem (mem_info.total_number_of_free_pages, | |
1384 | "DPMI Free Physical Memory......", 1); | |
1385 | print_mem (mem_info.size_of_paging_file_partition_in_pages, | |
1386 | "DPMI Swap Space................", 1); | |
1387 | print_mem (mem_info.linear_address_space_size_in_pages, | |
1388 | "DPMI Total Linear Address Size.", 1); | |
1389 | print_mem (mem_info.free_linear_address_space_in_pages, | |
1390 | "DPMI Free Linear Address Size..", 1); | |
1391 | print_mem (mem_info.largest_available_free_block_in_bytes, | |
1392 | "DPMI Largest Free Memory Block.", 0); | |
1393 | ||
1394 | regs.h.ah = 0x48; | |
1395 | regs.x.bx = 0xffff; | |
1396 | __dpmi_int (0x21, ®s); | |
1397 | print_mem (regs.x.bx << 4, "Free DOS Memory................", 0); | |
1398 | regs.x.ax = 0x5800; | |
1399 | __dpmi_int (0x21, ®s); | |
1400 | if ((regs.x.flags & 1) == 0) | |
1401 | { | |
1402 | static const char *dos_hilo[] = { | |
1403 | "Low", "", "", "", "High", "", "", "", "High, then Low" | |
1404 | }; | |
1405 | static const char *dos_fit[] = { | |
1406 | "First", "Best", "Last" | |
1407 | }; | |
1408 | int hilo_idx = (regs.x.ax >> 4) & 0x0f; | |
1409 | int fit_idx = regs.x.ax & 0x0f; | |
1410 | ||
1411 | if (hilo_idx > 8) | |
1412 | hilo_idx = 0; | |
1413 | if (fit_idx > 2) | |
1414 | fit_idx = 0; | |
6cb06a8c TT |
1415 | gdb_printf ("DOS Memory Allocation..........%s memory, %s fit\n", |
1416 | dos_hilo[hilo_idx], dos_fit[fit_idx]); | |
10ba702d EZ |
1417 | regs.x.ax = 0x5802; |
1418 | __dpmi_int (0x21, ®s); | |
1419 | if ((regs.x.flags & 1) != 0) | |
1420 | regs.h.al = 0; | |
6cb06a8c TT |
1421 | gdb_printf ("%*sUMBs %sin DOS memory chain\n", 31, "", |
1422 | regs.h.al == 0 ? "not " : ""); | |
10ba702d EZ |
1423 | } |
1424 | } | |
1425 | ||
1426 | struct seg_descr { | |
9d0b3624 PA |
1427 | unsigned short limit0; |
1428 | unsigned short base0; | |
1429 | unsigned char base1; | |
1430 | unsigned stype:5; | |
1431 | unsigned dpl:2; | |
1432 | unsigned present:1; | |
1433 | unsigned limit1:4; | |
1434 | unsigned available:1; | |
1435 | unsigned dummy:1; | |
1436 | unsigned bit32:1; | |
1437 | unsigned page_granular:1; | |
1438 | unsigned char base2; | |
1439 | } __attribute__ ((packed)); | |
10ba702d EZ |
1440 | |
1441 | struct gate_descr { | |
9d0b3624 PA |
1442 | unsigned short offset0; |
1443 | unsigned short selector; | |
1444 | unsigned param_count:5; | |
1445 | unsigned dummy:3; | |
1446 | unsigned stype:5; | |
1447 | unsigned dpl:2; | |
1448 | unsigned present:1; | |
1449 | unsigned short offset1; | |
1450 | } __attribute__ ((packed)); | |
10ba702d EZ |
1451 | |
1452 | /* Read LEN bytes starting at logical address ADDR, and put the result | |
1453 | into DEST. Return 1 if success, zero if not. */ | |
1454 | static int | |
1455 | read_memory_region (unsigned long addr, void *dest, size_t len) | |
1456 | { | |
1457 | unsigned long dos_ds_limit = __dpmi_get_segment_limit (_dos_ds); | |
9f20bf26 | 1458 | int retval = 1; |
10ba702d EZ |
1459 | |
1460 | /* For the low memory, we can simply use _dos_ds. */ | |
1461 | if (addr <= dos_ds_limit - len) | |
1462 | dosmemget (addr, len, dest); | |
1463 | else | |
1464 | { | |
1465 | /* For memory above 1MB we need to set up a special segment to | |
1466 | be able to access that memory. */ | |
1467 | int sel = __dpmi_allocate_ldt_descriptors (1); | |
1468 | ||
9f20bf26 EZ |
1469 | if (sel <= 0) |
1470 | retval = 0; | |
1471 | else | |
1472 | { | |
1473 | int access_rights = __dpmi_get_descriptor_access_rights (sel); | |
1474 | size_t segment_limit = len - 1; | |
1475 | ||
1476 | /* Make sure the crucial bits in the descriptor access | |
1477 | rights are set correctly. Some DPMI providers might barf | |
1478 | if we set the segment limit to something that is not an | |
1479 | integral multiple of 4KB pages if the granularity bit is | |
1480 | not set to byte-granular, even though the DPMI spec says | |
1481 | it's the host's responsibility to set that bit correctly. */ | |
1482 | if (len > 1024 * 1024) | |
1483 | { | |
1484 | access_rights |= 0x8000; | |
1485 | /* Page-granular segments should have the low 12 bits of | |
1486 | the limit set. */ | |
1487 | segment_limit |= 0xfff; | |
1488 | } | |
1489 | else | |
1490 | access_rights &= ~0x8000; | |
1491 | ||
1492 | if (__dpmi_set_segment_base_address (sel, addr) != -1 | |
1493 | && __dpmi_set_descriptor_access_rights (sel, access_rights) != -1 | |
2033c18a EZ |
1494 | && __dpmi_set_segment_limit (sel, segment_limit) != -1 |
1495 | /* W2K silently fails to set the segment limit, leaving | |
1496 | it at zero; this test avoids the resulting crash. */ | |
1497 | && __dpmi_get_segment_limit (sel) >= segment_limit) | |
9f20bf26 EZ |
1498 | movedata (sel, 0, _my_ds (), (unsigned)dest, len); |
1499 | else | |
1500 | retval = 0; | |
1501 | ||
1502 | __dpmi_free_ldt_descriptor (sel); | |
1503 | } | |
10ba702d | 1504 | } |
9f20bf26 | 1505 | return retval; |
10ba702d EZ |
1506 | } |
1507 | ||
1508 | /* Get a segment descriptor stored at index IDX in the descriptor | |
1509 | table whose base address is TABLE_BASE. Return the descriptor | |
1510 | type, or -1 if failure. */ | |
1511 | static int | |
1512 | get_descriptor (unsigned long table_base, int idx, void *descr) | |
1513 | { | |
1514 | unsigned long addr = table_base + idx * 8; /* 8 bytes per entry */ | |
1515 | ||
1516 | if (read_memory_region (addr, descr, 8)) | |
1517 | return (int)((struct seg_descr *)descr)->stype; | |
1518 | return -1; | |
1519 | } | |
1520 | ||
1521 | struct dtr_reg { | |
1522 | unsigned short limit __attribute__((packed)); | |
1523 | unsigned long base __attribute__((packed)); | |
1524 | }; | |
1525 | ||
1526 | /* Display a segment descriptor stored at index IDX in a descriptor | |
1527 | table whose type is TYPE and whose base address is BASE_ADDR. If | |
1528 | FORCE is non-zero, display even invalid descriptors. */ | |
1529 | static void | |
1530 | display_descriptor (unsigned type, unsigned long base_addr, int idx, int force) | |
1531 | { | |
1532 | struct seg_descr descr; | |
1533 | struct gate_descr gate; | |
1534 | ||
1535 | /* Get the descriptor from the table. */ | |
1536 | if (idx == 0 && type == 0) | |
0426ad51 | 1537 | gdb_puts ("0x000: null descriptor\n"); |
10ba702d EZ |
1538 | else if (get_descriptor (base_addr, idx, &descr) != -1) |
1539 | { | |
1540 | /* For each type of descriptor table, this has a bit set if the | |
1541 | corresponding type of selectors is valid in that table. */ | |
1542 | static unsigned allowed_descriptors[] = { | |
1543 | 0xffffdafeL, /* GDT */ | |
1544 | 0x0000c0e0L, /* IDT */ | |
1545 | 0xffffdafaL /* LDT */ | |
1546 | }; | |
1547 | ||
1548 | /* If the program hasn't started yet, assume the debuggee will | |
1549 | have the same CPL as the debugger. */ | |
1550 | int cpl = prog_has_started ? (a_tss.tss_cs & 3) : _my_cs () & 3; | |
1551 | unsigned long limit = (descr.limit1 << 16) | descr.limit0; | |
1552 | ||
1553 | if (descr.present | |
1554 | && (allowed_descriptors[type] & (1 << descr.stype)) != 0) | |
1555 | { | |
6cb06a8c TT |
1556 | gdb_printf ("0x%03x: ", |
1557 | type == 1 | |
1558 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); | |
10ba702d EZ |
1559 | if (descr.page_granular) |
1560 | limit = (limit << 12) | 0xfff; /* big segment: low 12 bit set */ | |
1561 | if (descr.stype == 1 || descr.stype == 2 || descr.stype == 3 | |
1562 | || descr.stype == 9 || descr.stype == 11 | |
1563 | || (descr.stype >= 16 && descr.stype < 32)) | |
6cb06a8c TT |
1564 | gdb_printf ("base=0x%02x%02x%04x limit=0x%08lx", |
1565 | descr.base2, descr.base1, descr.base0, limit); | |
10ba702d EZ |
1566 | |
1567 | switch (descr.stype) | |
1568 | { | |
1569 | case 1: | |
1570 | case 3: | |
6cb06a8c TT |
1571 | gdb_printf (" 16-bit TSS (task %sactive)", |
1572 | descr.stype == 3 ? "" : "in"); | |
10ba702d EZ |
1573 | break; |
1574 | case 2: | |
0426ad51 | 1575 | gdb_puts (" LDT"); |
10ba702d EZ |
1576 | break; |
1577 | case 4: | |
1578 | memcpy (&gate, &descr, sizeof gate); | |
6cb06a8c TT |
1579 | gdb_printf ("selector=0x%04x offs=0x%04x%04x", |
1580 | gate.selector, gate.offset1, gate.offset0); | |
1581 | gdb_printf (" 16-bit Call Gate (params=%d)", | |
1582 | gate.param_count); | |
10ba702d EZ |
1583 | break; |
1584 | case 5: | |
6cb06a8c TT |
1585 | gdb_printf ("TSS selector=0x%04x", descr.base0); |
1586 | gdb_printf ("%*sTask Gate", 16, ""); | |
10ba702d EZ |
1587 | break; |
1588 | case 6: | |
1589 | case 7: | |
1590 | memcpy (&gate, &descr, sizeof gate); | |
6cb06a8c TT |
1591 | gdb_printf ("selector=0x%04x offs=0x%04x%04x", |
1592 | gate.selector, gate.offset1, gate.offset0); | |
1593 | gdb_printf (" 16-bit %s Gate", | |
1594 | descr.stype == 6 ? "Interrupt" : "Trap"); | |
10ba702d EZ |
1595 | break; |
1596 | case 9: | |
1597 | case 11: | |
6cb06a8c TT |
1598 | gdb_printf (" 32-bit TSS (task %sactive)", |
1599 | descr.stype == 3 ? "" : "in"); | |
10ba702d EZ |
1600 | break; |
1601 | case 12: | |
1602 | memcpy (&gate, &descr, sizeof gate); | |
6cb06a8c TT |
1603 | gdb_printf ("selector=0x%04x offs=0x%04x%04x", |
1604 | gate.selector, gate.offset1, gate.offset0); | |
1605 | gdb_printf (" 32-bit Call Gate (params=%d)", | |
1606 | gate.param_count); | |
10ba702d EZ |
1607 | break; |
1608 | case 14: | |
1609 | case 15: | |
1610 | memcpy (&gate, &descr, sizeof gate); | |
6cb06a8c TT |
1611 | gdb_printf ("selector=0x%04x offs=0x%04x%04x", |
1612 | gate.selector, gate.offset1, gate.offset0); | |
1613 | gdb_printf (" 32-bit %s Gate", | |
1614 | descr.stype == 14 ? "Interrupt" : "Trap"); | |
10ba702d EZ |
1615 | break; |
1616 | case 16: /* data segments */ | |
1617 | case 17: | |
1618 | case 18: | |
1619 | case 19: | |
1620 | case 20: | |
1621 | case 21: | |
1622 | case 22: | |
1623 | case 23: | |
6cb06a8c TT |
1624 | gdb_printf (" %s-bit Data (%s Exp-%s%s)", |
1625 | descr.bit32 ? "32" : "16", | |
1626 | descr.stype & 2 | |
1627 | ? "Read/Write," : "Read-Only, ", | |
1628 | descr.stype & 4 ? "down" : "up", | |
1629 | descr.stype & 1 ? "" : ", N.Acc"); | |
10ba702d EZ |
1630 | break; |
1631 | case 24: /* code segments */ | |
1632 | case 25: | |
1633 | case 26: | |
1634 | case 27: | |
1635 | case 28: | |
1636 | case 29: | |
1637 | case 30: | |
1638 | case 31: | |
6cb06a8c TT |
1639 | gdb_printf (" %s-bit Code (%s, %sConf%s)", |
1640 | descr.bit32 ? "32" : "16", | |
1641 | descr.stype & 2 ? "Exec/Read" : "Exec-Only", | |
1642 | descr.stype & 4 ? "" : "N.", | |
1643 | descr.stype & 1 ? "" : ", N.Acc"); | |
10ba702d EZ |
1644 | break; |
1645 | default: | |
6cb06a8c | 1646 | gdb_printf ("Unknown type 0x%02x", descr.stype); |
10ba702d EZ |
1647 | break; |
1648 | } | |
0426ad51 | 1649 | gdb_puts ("\n"); |
10ba702d EZ |
1650 | } |
1651 | else if (force) | |
1652 | { | |
6cb06a8c TT |
1653 | gdb_printf ("0x%03x: ", |
1654 | type == 1 | |
1655 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); | |
10ba702d | 1656 | if (!descr.present) |
0426ad51 | 1657 | gdb_puts ("Segment not present\n"); |
10ba702d | 1658 | else |
6cb06a8c TT |
1659 | gdb_printf ("Segment type 0x%02x is invalid in this table\n", |
1660 | descr.stype); | |
10ba702d EZ |
1661 | } |
1662 | } | |
1663 | else if (force) | |
6cb06a8c | 1664 | gdb_printf ("0x%03x: Cannot read this descriptor\n", idx); |
10ba702d EZ |
1665 | } |
1666 | ||
1667 | static void | |
5fed81ff | 1668 | go32_sldt (const char *arg, int from_tty) |
10ba702d EZ |
1669 | { |
1670 | struct dtr_reg gdtr; | |
1671 | unsigned short ldtr = 0; | |
1672 | int ldt_idx; | |
1673 | struct seg_descr ldt_descr; | |
1674 | long ldt_entry = -1L; | |
1675 | int cpl = (prog_has_started ? a_tss.tss_cs : _my_cs ()) & 3; | |
1676 | ||
1677 | if (arg && *arg) | |
1678 | { | |
529480d0 | 1679 | arg = skip_spaces (arg); |
10ba702d EZ |
1680 | |
1681 | if (*arg) | |
1682 | { | |
1683 | ldt_entry = parse_and_eval_long (arg); | |
1684 | if (ldt_entry < 0 | |
1685 | || (ldt_entry & 4) == 0 | |
1686 | || (ldt_entry & 3) != (cpl & 3)) | |
8a3fe4f8 | 1687 | error (_("Invalid LDT entry 0x%03lx."), (unsigned long)ldt_entry); |
10ba702d EZ |
1688 | } |
1689 | } | |
1690 | ||
1691 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1692 | __asm__ __volatile__ ("sldt %0" : "=m" (ldtr) : /* no inputs */ ); | |
1693 | ldt_idx = ldtr / 8; | |
1694 | if (ldt_idx == 0) | |
0426ad51 | 1695 | gdb_puts ("There is no LDT.\n"); |
10ba702d EZ |
1696 | /* LDT's entry in the GDT must have the type LDT, which is 2. */ |
1697 | else if (get_descriptor (gdtr.base, ldt_idx, &ldt_descr) != 2) | |
6cb06a8c TT |
1698 | gdb_printf ("LDT is present (at %#x), but unreadable by GDB.\n", |
1699 | ldt_descr.base0 | |
1700 | | (ldt_descr.base1 << 16) | |
1701 | | (ldt_descr.base2 << 24)); | |
10ba702d EZ |
1702 | else |
1703 | { | |
1704 | unsigned base = | |
1705 | ldt_descr.base0 | |
1706 | | (ldt_descr.base1 << 16) | |
1707 | | (ldt_descr.base2 << 24); | |
1708 | unsigned limit = ldt_descr.limit0 | (ldt_descr.limit1 << 16); | |
1709 | int max_entry; | |
1710 | ||
1711 | if (ldt_descr.page_granular) | |
1712 | /* Page-granular segments must have the low 12 bits of their | |
1713 | limit set. */ | |
1714 | limit = (limit << 12) | 0xfff; | |
1715 | /* LDT cannot have more than 8K 8-byte entries, i.e. more than | |
1716 | 64KB. */ | |
1717 | if (limit > 0xffff) | |
1718 | limit = 0xffff; | |
1719 | ||
1720 | max_entry = (limit + 1) / 8; | |
1721 | ||
1722 | if (ldt_entry >= 0) | |
1723 | { | |
1724 | if (ldt_entry > limit) | |
8a3fe4f8 | 1725 | error (_("Invalid LDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1726 | (unsigned long)ldt_entry, limit); |
10ba702d EZ |
1727 | |
1728 | display_descriptor (ldt_descr.stype, base, ldt_entry / 8, 1); | |
1729 | } | |
1730 | else | |
1731 | { | |
1732 | int i; | |
1733 | ||
1734 | for (i = 0; i < max_entry; i++) | |
1735 | display_descriptor (ldt_descr.stype, base, i, 0); | |
1736 | } | |
1737 | } | |
1738 | } | |
1739 | ||
1740 | static void | |
5fed81ff | 1741 | go32_sgdt (const char *arg, int from_tty) |
10ba702d EZ |
1742 | { |
1743 | struct dtr_reg gdtr; | |
1744 | long gdt_entry = -1L; | |
1745 | int max_entry; | |
1746 | ||
1747 | if (arg && *arg) | |
1748 | { | |
529480d0 | 1749 | arg = skip_spaces (arg); |
10ba702d EZ |
1750 | |
1751 | if (*arg) | |
1752 | { | |
1753 | gdt_entry = parse_and_eval_long (arg); | |
1754 | if (gdt_entry < 0 || (gdt_entry & 7) != 0) | |
0963b4bd MS |
1755 | error (_("Invalid GDT entry 0x%03lx: " |
1756 | "not an integral multiple of 8."), | |
ccbc3e6f | 1757 | (unsigned long)gdt_entry); |
10ba702d EZ |
1758 | } |
1759 | } | |
1760 | ||
1761 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1762 | max_entry = (gdtr.limit + 1) / 8; | |
1763 | ||
1764 | if (gdt_entry >= 0) | |
1765 | { | |
1766 | if (gdt_entry > gdtr.limit) | |
8a3fe4f8 | 1767 | error (_("Invalid GDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1768 | (unsigned long)gdt_entry, gdtr.limit); |
10ba702d EZ |
1769 | |
1770 | display_descriptor (0, gdtr.base, gdt_entry / 8, 1); | |
1771 | } | |
1772 | else | |
1773 | { | |
1774 | int i; | |
1775 | ||
1776 | for (i = 0; i < max_entry; i++) | |
1777 | display_descriptor (0, gdtr.base, i, 0); | |
1778 | } | |
1779 | } | |
1780 | ||
1781 | static void | |
5fed81ff | 1782 | go32_sidt (const char *arg, int from_tty) |
10ba702d EZ |
1783 | { |
1784 | struct dtr_reg idtr; | |
1785 | long idt_entry = -1L; | |
1786 | int max_entry; | |
1787 | ||
1788 | if (arg && *arg) | |
1789 | { | |
529480d0 | 1790 | arg = skip_spaces (arg); |
10ba702d EZ |
1791 | |
1792 | if (*arg) | |
1793 | { | |
1794 | idt_entry = parse_and_eval_long (arg); | |
1795 | if (idt_entry < 0) | |
8a3fe4f8 | 1796 | error (_("Invalid (negative) IDT entry %ld."), idt_entry); |
10ba702d EZ |
1797 | } |
1798 | } | |
1799 | ||
1800 | __asm__ __volatile__ ("sidt %0" : "=m" (idtr) : /* no inputs */ ); | |
1801 | max_entry = (idtr.limit + 1) / 8; | |
0963b4bd | 1802 | if (max_entry > 0x100) /* No more than 256 entries. */ |
10ba702d EZ |
1803 | max_entry = 0x100; |
1804 | ||
1805 | if (idt_entry >= 0) | |
1806 | { | |
1807 | if (idt_entry > idtr.limit) | |
8a3fe4f8 | 1808 | error (_("Invalid IDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1809 | (unsigned long)idt_entry, idtr.limit); |
10ba702d EZ |
1810 | |
1811 | display_descriptor (1, idtr.base, idt_entry, 1); | |
1812 | } | |
1813 | else | |
1814 | { | |
1815 | int i; | |
1816 | ||
1817 | for (i = 0; i < max_entry; i++) | |
1818 | display_descriptor (1, idtr.base, i, 0); | |
1819 | } | |
1820 | } | |
1821 | ||
9f20bf26 EZ |
1822 | /* Cached linear address of the base of the page directory. For |
1823 | now, available only under CWSDPMI. Code based on ideas and | |
1824 | suggestions from Charles Sandmann <sandmann@clio.rice.edu>. */ | |
1825 | static unsigned long pdbr; | |
1826 | ||
1827 | static unsigned long | |
1828 | get_cr3 (void) | |
1829 | { | |
1830 | unsigned offset; | |
1831 | unsigned taskreg; | |
1832 | unsigned long taskbase, cr3; | |
1833 | struct dtr_reg gdtr; | |
1834 | ||
1835 | if (pdbr > 0 && pdbr <= 0xfffff) | |
1836 | return pdbr; | |
1837 | ||
1838 | /* Get the linear address of GDT and the Task Register. */ | |
1839 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1840 | __asm__ __volatile__ ("str %0" : "=m" (taskreg) : /* no inputs */ ); | |
1841 | ||
1842 | /* Task Register is a segment selector for the TSS of the current | |
1843 | task. Therefore, it can be used as an index into the GDT to get | |
1844 | at the segment descriptor for the TSS. To get the index, reset | |
1845 | the low 3 bits of the selector (which give the CPL). Add 2 to the | |
1846 | offset to point to the 3 low bytes of the base address. */ | |
1847 | offset = gdtr.base + (taskreg & 0xfff8) + 2; | |
1848 | ||
1849 | ||
1850 | /* CWSDPMI's task base is always under the 1MB mark. */ | |
1851 | if (offset > 0xfffff) | |
1852 | return 0; | |
1853 | ||
1854 | _farsetsel (_dos_ds); | |
1855 | taskbase = _farnspeekl (offset) & 0xffffffU; | |
1856 | taskbase += _farnspeekl (offset + 2) & 0xff000000U; | |
1857 | if (taskbase > 0xfffff) | |
1858 | return 0; | |
1859 | ||
1860 | /* CR3 (a.k.a. PDBR, the Page Directory Base Register) is stored at | |
1861 | offset 1Ch in the TSS. */ | |
1862 | cr3 = _farnspeekl (taskbase + 0x1c) & ~0xfff; | |
1863 | if (cr3 > 0xfffff) | |
1864 | { | |
85102364 | 1865 | #if 0 /* Not fully supported yet. */ |
9f20bf26 EZ |
1866 | /* The Page Directory is in UMBs. In that case, CWSDPMI puts |
1867 | the first Page Table right below the Page Directory. Thus, | |
1868 | the first Page Table's entry for its own address and the Page | |
1869 | Directory entry for that Page Table will hold the same | |
1870 | physical address. The loop below searches the entire UMB | |
85102364 | 1871 | range of addresses for such an occurrence. */ |
9f20bf26 EZ |
1872 | unsigned long addr, pte_idx; |
1873 | ||
1874 | for (addr = 0xb0000, pte_idx = 0xb0; | |
1875 | pte_idx < 0xff; | |
1876 | addr += 0x1000, pte_idx++) | |
1877 | { | |
1878 | if (((_farnspeekl (addr + 4 * pte_idx) & 0xfffff027) == | |
1879 | (_farnspeekl (addr + 0x1000) & 0xfffff027)) | |
1880 | && ((_farnspeekl (addr + 4 * pte_idx + 4) & 0xfffff000) == cr3)) | |
1881 | { | |
1882 | cr3 = addr + 0x1000; | |
1883 | break; | |
1884 | } | |
1885 | } | |
a3b9cbb3 | 1886 | #endif |
9f20bf26 EZ |
1887 | |
1888 | if (cr3 > 0xfffff) | |
1889 | cr3 = 0; | |
1890 | } | |
1891 | ||
1892 | return cr3; | |
1893 | } | |
1894 | ||
1895 | /* Return the N'th Page Directory entry. */ | |
1896 | static unsigned long | |
1897 | get_pde (int n) | |
1898 | { | |
1899 | unsigned long pde = 0; | |
1900 | ||
1901 | if (pdbr && n >= 0 && n < 1024) | |
1902 | { | |
1903 | pde = _farpeekl (_dos_ds, pdbr + 4*n); | |
1904 | } | |
1905 | return pde; | |
1906 | } | |
1907 | ||
1908 | /* Return the N'th entry of the Page Table whose Page Directory entry | |
1909 | is PDE. */ | |
1910 | static unsigned long | |
1911 | get_pte (unsigned long pde, int n) | |
1912 | { | |
1913 | unsigned long pte = 0; | |
1914 | ||
1915 | /* pde & 0x80 tests the 4MB page bit. We don't support 4MB | |
1916 | page tables, for now. */ | |
1917 | if ((pde & 1) && !(pde & 0x80) && n >= 0 && n < 1024) | |
1918 | { | |
0963b4bd | 1919 | pde &= ~0xfff; /* Clear non-address bits. */ |
9f20bf26 EZ |
1920 | pte = _farpeekl (_dos_ds, pde + 4*n); |
1921 | } | |
1922 | return pte; | |
1923 | } | |
1924 | ||
1925 | /* Display a Page Directory or Page Table entry. IS_DIR, if non-zero, | |
1926 | says this is a Page Directory entry. If FORCE is non-zero, display | |
1927 | the entry even if its Present flag is off. OFF is the offset of the | |
1928 | address from the page's base address. */ | |
1929 | static void | |
1930 | display_ptable_entry (unsigned long entry, int is_dir, int force, unsigned off) | |
1931 | { | |
1932 | if ((entry & 1) != 0) | |
1933 | { | |
6cb06a8c | 1934 | gdb_printf ("Base=0x%05lx000", entry >> 12); |
9f20bf26 | 1935 | if ((entry & 0x100) && !is_dir) |
0426ad51 | 1936 | gdb_puts (" Global"); |
9f20bf26 | 1937 | if ((entry & 0x40) && !is_dir) |
0426ad51 | 1938 | gdb_puts (" Dirty"); |
6cb06a8c TT |
1939 | gdb_printf (" %sAcc.", (entry & 0x20) ? "" : "Not-"); |
1940 | gdb_printf (" %sCached", (entry & 0x10) ? "" : "Not-"); | |
1941 | gdb_printf (" Write-%s", (entry & 8) ? "Thru" : "Back"); | |
1942 | gdb_printf (" %s", (entry & 4) ? "Usr" : "Sup"); | |
1943 | gdb_printf (" Read-%s", (entry & 2) ? "Write" : "Only"); | |
9f20bf26 | 1944 | if (off) |
6cb06a8c | 1945 | gdb_printf (" +0x%x", off); |
0426ad51 | 1946 | gdb_puts ("\n"); |
9f20bf26 EZ |
1947 | } |
1948 | else if (force) | |
6cb06a8c TT |
1949 | gdb_printf ("Page%s not present or not supported; value=0x%lx.\n", |
1950 | is_dir ? " Table" : "", entry >> 1); | |
9f20bf26 EZ |
1951 | } |
1952 | ||
1953 | static void | |
5fed81ff | 1954 | go32_pde (const char *arg, int from_tty) |
9f20bf26 EZ |
1955 | { |
1956 | long pde_idx = -1, i; | |
1957 | ||
1958 | if (arg && *arg) | |
1959 | { | |
529480d0 | 1960 | arg = skip_spaces (arg); |
9f20bf26 EZ |
1961 | |
1962 | if (*arg) | |
1963 | { | |
1964 | pde_idx = parse_and_eval_long (arg); | |
1965 | if (pde_idx < 0 || pde_idx >= 1024) | |
8a3fe4f8 | 1966 | error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx); |
9f20bf26 EZ |
1967 | } |
1968 | } | |
1969 | ||
1970 | pdbr = get_cr3 (); | |
1971 | if (!pdbr) | |
0426ad51 TT |
1972 | gdb_puts ("Access to Page Directories is " |
1973 | "not supported on this system.\n"); | |
9f20bf26 EZ |
1974 | else if (pde_idx >= 0) |
1975 | display_ptable_entry (get_pde (pde_idx), 1, 1, 0); | |
1976 | else | |
1977 | for (i = 0; i < 1024; i++) | |
1978 | display_ptable_entry (get_pde (i), 1, 0, 0); | |
1979 | } | |
1980 | ||
1981 | /* A helper function to display entries in a Page Table pointed to by | |
1982 | the N'th entry in the Page Directory. If FORCE is non-zero, say | |
1983 | something even if the Page Table is not accessible. */ | |
1984 | static void | |
1985 | display_page_table (long n, int force) | |
1986 | { | |
1987 | unsigned long pde = get_pde (n); | |
1988 | ||
1989 | if ((pde & 1) != 0) | |
1990 | { | |
1991 | int i; | |
1992 | ||
6cb06a8c TT |
1993 | gdb_printf ("Page Table pointed to by " |
1994 | "Page Directory entry 0x%lx:\n", n); | |
9f20bf26 EZ |
1995 | for (i = 0; i < 1024; i++) |
1996 | display_ptable_entry (get_pte (pde, i), 0, 0, 0); | |
0426ad51 | 1997 | gdb_puts ("\n"); |
9f20bf26 EZ |
1998 | } |
1999 | else if (force) | |
6cb06a8c | 2000 | gdb_printf ("Page Table not present; value=0x%lx.\n", pde >> 1); |
9f20bf26 EZ |
2001 | } |
2002 | ||
2003 | static void | |
5fed81ff | 2004 | go32_pte (const char *arg, int from_tty) |
9f20bf26 | 2005 | { |
ccbc3e6f | 2006 | long pde_idx = -1L, i; |
9f20bf26 EZ |
2007 | |
2008 | if (arg && *arg) | |
2009 | { | |
529480d0 | 2010 | arg = skip_spaces (arg); |
9f20bf26 EZ |
2011 | |
2012 | if (*arg) | |
2013 | { | |
2014 | pde_idx = parse_and_eval_long (arg); | |
2015 | if (pde_idx < 0 || pde_idx >= 1024) | |
8a3fe4f8 | 2016 | error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx); |
9f20bf26 EZ |
2017 | } |
2018 | } | |
2019 | ||
2020 | pdbr = get_cr3 (); | |
2021 | if (!pdbr) | |
0426ad51 | 2022 | gdb_puts ("Access to Page Tables is not supported on this system.\n"); |
9f20bf26 EZ |
2023 | else if (pde_idx >= 0) |
2024 | display_page_table (pde_idx, 1); | |
2025 | else | |
2026 | for (i = 0; i < 1024; i++) | |
2027 | display_page_table (i, 0); | |
2028 | } | |
2029 | ||
2030 | static void | |
5fed81ff | 2031 | go32_pte_for_address (const char *arg, int from_tty) |
9f20bf26 EZ |
2032 | { |
2033 | CORE_ADDR addr = 0, i; | |
2034 | ||
2035 | if (arg && *arg) | |
2036 | { | |
529480d0 | 2037 | arg = skip_spaces (arg); |
9f20bf26 EZ |
2038 | |
2039 | if (*arg) | |
2040 | addr = parse_and_eval_address (arg); | |
2041 | } | |
2042 | if (!addr) | |
e2e0b3e5 | 2043 | error_no_arg (_("linear address")); |
9f20bf26 EZ |
2044 | |
2045 | pdbr = get_cr3 (); | |
2046 | if (!pdbr) | |
0426ad51 | 2047 | gdb_puts ("Access to Page Tables is not supported on this system.\n"); |
9f20bf26 EZ |
2048 | else |
2049 | { | |
2050 | int pde_idx = (addr >> 22) & 0x3ff; | |
2051 | int pte_idx = (addr >> 12) & 0x3ff; | |
2052 | unsigned offs = addr & 0xfff; | |
2053 | ||
6cb06a8c TT |
2054 | gdb_printf ("Page Table entry for address %s:\n", |
2055 | hex_string(addr)); | |
9f20bf26 EZ |
2056 | display_ptable_entry (get_pte (get_pde (pde_idx), pte_idx), 0, 1, offs); |
2057 | } | |
2058 | } | |
2059 | ||
d8c852a1 EZ |
2060 | static struct cmd_list_element *info_dos_cmdlist = NULL; |
2061 | ||
6c265988 | 2062 | void _initialize_go32_nat (); |
e49d4fa6 | 2063 | void |
6c265988 | 2064 | _initialize_go32_nat () |
e49d4fa6 | 2065 | { |
df7e5265 GB |
2066 | x86_dr_low.set_control = go32_set_dr7; |
2067 | x86_dr_low.set_addr = go32_set_dr; | |
2068 | x86_dr_low.get_status = go32_get_dr6; | |
2069 | x86_dr_low.get_control = go32_get_dr7; | |
2070 | x86_dr_low.get_addr = go32_get_dr; | |
2071 | x86_set_debug_register_length (4); | |
c1a7b7c6 | 2072 | |
d9f719f1 | 2073 | add_inf_child_target (&the_go32_nat_target); |
c1a7b7c6 PA |
2074 | |
2075 | /* Initialize child's cwd as empty to be initialized when starting | |
2076 | the child. */ | |
2077 | *child_cwd = 0; | |
2078 | ||
2079 | /* Initialize child's command line storage. */ | |
2080 | if (redir_debug_init (&child_cmd) == -1) | |
f34652de | 2081 | internal_error (_("Cannot allocate redirection storage: " |
c1a7b7c6 PA |
2082 | "not enough memory.\n")); |
2083 | ||
2084 | /* We are always processing GCC-compiled programs. */ | |
2085 | processing_gcc_compilation = 2; | |
10ba702d | 2086 | |
0743fc83 | 2087 | add_basic_prefix_cmd ("dos", class_info, _("\ |
1bedd215 | 2088 | Print information specific to DJGPP (aka MS-DOS) debugging."), |
2f822da5 | 2089 | &info_dos_cmdlist, 0, &infolist); |
d8c852a1 | 2090 | |
1a966eab AC |
2091 | add_cmd ("sysinfo", class_info, go32_sysinfo, _("\ |
2092 | Display information about the target system, including CPU, OS, DPMI, etc."), | |
d8c852a1 | 2093 | &info_dos_cmdlist); |
1a966eab AC |
2094 | add_cmd ("ldt", class_info, go32_sldt, _("\ |
2095 | Display entries in the LDT (Local Descriptor Table).\n\ | |
2096 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2097 | &info_dos_cmdlist); |
1a966eab AC |
2098 | add_cmd ("gdt", class_info, go32_sgdt, _("\ |
2099 | Display entries in the GDT (Global Descriptor Table).\n\ | |
2100 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2101 | &info_dos_cmdlist); |
1a966eab AC |
2102 | add_cmd ("idt", class_info, go32_sidt, _("\ |
2103 | Display entries in the IDT (Interrupt Descriptor Table).\n\ | |
2104 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2105 | &info_dos_cmdlist); |
1a966eab AC |
2106 | add_cmd ("pde", class_info, go32_pde, _("\ |
2107 | Display entries in the Page Directory.\n\ | |
2108 | Entry number (an expression) as an argument means display only that entry."), | |
9f20bf26 | 2109 | &info_dos_cmdlist); |
1a966eab AC |
2110 | add_cmd ("pte", class_info, go32_pte, _("\ |
2111 | Display entries in Page Tables.\n\ | |
2112 | Entry number (an expression) as an argument means display only entries\n\ | |
2113 | from the Page Table pointed to by the specified Page Directory entry."), | |
9f20bf26 | 2114 | &info_dos_cmdlist); |
1a966eab AC |
2115 | add_cmd ("address-pte", class_info, go32_pte_for_address, _("\ |
2116 | Display a Page Table entry for a linear address.\n\ | |
2117 | The address argument must be a linear address, after adding to\n\ | |
2118 | it the base address of the appropriate segment.\n\ | |
2119 | The base address of variables and functions in the debuggee's data\n\ | |
2120 | or code segment is stored in the variable __djgpp_base_address,\n\ | |
2121 | so use `__djgpp_base_address + (char *)&var' as the argument.\n\ | |
2122 | For other segments, look up their base address in the output of\n\ | |
2123 | the `info dos ldt' command."), | |
9f20bf26 | 2124 | &info_dos_cmdlist); |
e49d4fa6 | 2125 | } |
53a5351d JM |
2126 | |
2127 | pid_t | |
2128 | tcgetpgrp (int fd) | |
2129 | { | |
2130 | if (isatty (fd)) | |
2131 | return SOME_PID; | |
2132 | errno = ENOTTY; | |
2133 | return -1; | |
2134 | } | |
2135 | ||
2136 | int | |
2137 | tcsetpgrp (int fd, pid_t pgid) | |
2138 | { | |
2139 | if (isatty (fd) && pgid == SOME_PID) | |
2140 | return 0; | |
2141 | errno = pgid == SOME_PID ? ENOTTY : ENOSYS; | |
2142 | return -1; | |
2143 | } |