Commit | Line | Data |
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e49d4fa6 | 1 | /* Native debugging support for Intel x86 running DJGPP. |
0fb0cc75 | 2 | Copyright (C) 1997, 1999, 2000, 2001, 2005, 2006, 2007, 2008, 2009 |
281b533b | 3 | Free Software Foundation, Inc. |
e49d4fa6 SS |
4 | Written by Robert Hoehne. |
5 | ||
c5aa993b | 6 | This file is part of GDB. |
e49d4fa6 | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
e49d4fa6 | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
e49d4fa6 | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
e49d4fa6 | 20 | |
699275c9 EZ |
21 | /* To whomever it may concern, here's a general description of how |
22 | debugging in DJGPP works, and the special quirks GDB does to | |
23 | support that. | |
24 | ||
25 | When the DJGPP port of GDB is debugging a DJGPP program natively, | |
26 | there aren't 2 separate processes, the debuggee and GDB itself, as | |
27 | on other systems. (This is DOS, where there can only be one active | |
28 | process at any given time, remember?) Instead, GDB and the | |
29 | debuggee live in the same process. So when GDB calls | |
30 | go32_create_inferior below, and that function calls edi_init from | |
31 | the DJGPP debug support library libdbg.a, we load the debuggee's | |
32 | executable file into GDB's address space, set it up for execution | |
33 | as the stub loader (a short real-mode program prepended to each | |
34 | DJGPP executable) normally would, and do a lot of preparations for | |
35 | swapping between GDB's and debuggee's internal state, primarily wrt | |
36 | the exception handlers. This swapping happens every time we resume | |
37 | the debuggee or switch back to GDB's code, and it includes: | |
38 | ||
39 | . swapping all the segment registers | |
40 | . swapping the PSP (the Program Segment Prefix) | |
41 | . swapping the signal handlers | |
42 | . swapping the exception handlers | |
43 | . swapping the FPU status | |
44 | . swapping the 3 standard file handles (more about this below) | |
45 | ||
46 | Then running the debuggee simply means longjmp into it where its PC | |
47 | is and let it run until it stops for some reason. When it stops, | |
48 | GDB catches the exception that stopped it and longjmp's back into | |
49 | its own code. All the possible exit points of the debuggee are | |
50 | watched; for example, the normal exit point is recognized because a | |
51 | DOS program issues a special system call to exit. If one of those | |
52 | exit points is hit, we mourn the inferior and clean up after it. | |
53 | Cleaning up is very important, even if the process exits normally, | |
54 | because otherwise we might leave behind traces of previous | |
55 | execution, and in several cases GDB itself might be left hosed, | |
56 | because all the exception handlers were not restored. | |
57 | ||
58 | Swapping of the standard handles (in redir_to_child and | |
59 | redir_to_debugger) is needed because, since both GDB and the | |
60 | debuggee live in the same process, as far as the OS is concerned, | |
61 | the share the same file table. This means that the standard | |
62 | handles 0, 1, and 2 point to the same file table entries, and thus | |
63 | are connected to the same devices. Therefore, if the debugger | |
64 | redirects its standard output, the standard output of the debuggee | |
65 | is also automagically redirected to the same file/device! | |
66 | Similarly, if the debuggee redirects its stdout to a file, you | |
67 | won't be able to see debugger's output (it will go to the same file | |
68 | where the debuggee has its output); and if the debuggee closes its | |
69 | standard input, you will lose the ability to talk to debugger! | |
70 | ||
71 | For this reason, every time the debuggee is about to be resumed, we | |
72 | call redir_to_child, which redirects the standard handles to where | |
73 | the debuggee expects them to be. When the debuggee stops and GDB | |
74 | regains control, we call redir_to_debugger, which redirects those 3 | |
75 | handles back to where GDB expects. | |
76 | ||
77 | Note that only the first 3 handles are swapped, so if the debuggee | |
78 | redirects or closes any other handles, GDB will not notice. In | |
79 | particular, the exit code of a DJGPP program forcibly closes all | |
80 | file handles beyond the first 3 ones, so when the debuggee exits, | |
81 | GDB currently loses its stdaux and stdprn streams. Fortunately, | |
82 | GDB does not use those as of this writing, and will never need | |
83 | to. */ | |
84 | ||
e49d4fa6 SS |
85 | #include <fcntl.h> |
86 | ||
87 | #include "defs.h" | |
e49d4fa6 | 88 | #include "inferior.h" |
444c3224 | 89 | #include "gdbthread.h" |
03f2053f | 90 | #include "gdb_wait.h" |
e49d4fa6 SS |
91 | #include "gdbcore.h" |
92 | #include "command.h" | |
d8c852a1 | 93 | #include "gdbcmd.h" |
e49d4fa6 | 94 | #include "floatformat.h" |
0fff5247 | 95 | #include "buildsym.h" |
e750d25e | 96 | #include "i387-tdep.h" |
e1195560 | 97 | #include "i386-tdep.h" |
4d277981 | 98 | #include "value.h" |
4e052eda | 99 | #include "regcache.h" |
4d277981 | 100 | #include "gdb_string.h" |
eaae3919 | 101 | #include "top.h" |
e49d4fa6 | 102 | |
10ba702d | 103 | #include <stdio.h> /* might be required for __DJGPP_MINOR__ */ |
e49d4fa6 | 104 | #include <stdlib.h> |
10ba702d | 105 | #include <ctype.h> |
53a5351d | 106 | #include <errno.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 SS |
122 | #if __DJGPP_MINOR__ < 3 |
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 | ||
c5aa993b JM |
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'. */ | |
c5aa993b | 156 | /* *INDENT-OFF* */ |
b83266a0 SS |
157 | |
158 | static void | |
159 | save_npx (void) | |
160 | { | |
1f5dc670 EZ |
161 | asm ("inb $0xa0, %%al \n\ |
162 | testb $0x20, %%al \n\ | |
163 | jz 1f \n\ | |
82cc5033 EZ |
164 | xorb %%al, %%al \n\ |
165 | outb %%al, $0xf0 \n\ | |
1f5dc670 | 166 | movb $0x20, %%al \n\ |
82cc5033 EZ |
167 | outb %%al, $0xa0 \n\ |
168 | outb %%al, $0x20 \n\ | |
1f5dc670 | 169 | 1: \n\ |
82cc5033 | 170 | fnsave %0 \n\ |
c5aa993b JM |
171 | fwait " |
172 | : "=m" (npx) | |
173 | : /* No input */ | |
174 | : "%eax"); | |
b83266a0 | 175 | } |
c5aa993b JM |
176 | |
177 | /* *INDENT-ON* */ | |
178 | ||
179 | ||
b83266a0 SS |
180 | /* ------------------------------------------------------------------------- */ |
181 | /* Reload the contents of the NPX from the global variable `npx'. */ | |
182 | ||
183 | static void | |
184 | load_npx (void) | |
185 | { | |
ba8629a9 | 186 | asm ("frstor %0":"=m" (npx)); |
b83266a0 | 187 | } |
53a5351d JM |
188 | /* ------------------------------------------------------------------------- */ |
189 | /* Stubs for the missing redirection functions. */ | |
190 | typedef struct { | |
191 | char *command; | |
192 | int redirected; | |
193 | } cmdline_t; | |
194 | ||
4d277981 | 195 | void |
ba8629a9 EZ |
196 | redir_cmdline_delete (cmdline_t *ptr) |
197 | { | |
198 | ptr->redirected = 0; | |
199 | } | |
4d277981 EZ |
200 | |
201 | int | |
202 | redir_cmdline_parse (const char *args, cmdline_t *ptr) | |
53a5351d JM |
203 | { |
204 | return -1; | |
205 | } | |
ba8629a9 | 206 | |
4d277981 EZ |
207 | int |
208 | redir_to_child (cmdline_t *ptr) | |
53a5351d JM |
209 | { |
210 | return 1; | |
211 | } | |
ba8629a9 | 212 | |
4d277981 EZ |
213 | int |
214 | redir_to_debugger (cmdline_t *ptr) | |
53a5351d JM |
215 | { |
216 | return 1; | |
217 | } | |
ba8629a9 | 218 | |
4d277981 | 219 | int |
ba8629a9 EZ |
220 | redir_debug_init (cmdline_t *ptr) |
221 | { | |
222 | return 0; | |
223 | } | |
b83266a0 SS |
224 | #endif /* __DJGPP_MINOR < 3 */ |
225 | ||
53a5351d JM |
226 | typedef enum { wp_insert, wp_remove, wp_count } wp_op; |
227 | ||
228 | /* This holds the current reference counts for each debug register. */ | |
229 | static int dr_ref_count[4]; | |
230 | ||
e49d4fa6 SS |
231 | #define SOME_PID 42 |
232 | ||
e49d4fa6 | 233 | static int prog_has_started = 0; |
c5aa993b JM |
234 | static void go32_open (char *name, int from_tty); |
235 | static void go32_close (int quitting); | |
685af672 EZ |
236 | static void go32_attach (struct target_ops *ops, char *args, int from_tty); |
237 | static void go32_detach (struct target_ops *ops, char *args, int from_tty); | |
28439f5e PA |
238 | static void go32_resume (struct target_ops *ops, |
239 | ptid_t ptid, int step, | |
240 | enum target_signal siggnal); | |
241 | static void go32_fetch_registers (struct target_ops *ops, | |
242 | struct regcache *, int regno); | |
56be3814 | 243 | static void store_register (const struct regcache *, int regno); |
28439f5e PA |
244 | static void go32_store_registers (struct target_ops *ops, |
245 | struct regcache *, int regno); | |
316f2060 | 246 | static void go32_prepare_to_store (struct regcache *); |
9d0b3624 | 247 | static int go32_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, |
a17b5c4e EZ |
248 | int write, |
249 | struct mem_attrib *attrib, | |
250 | struct target_ops *target); | |
c5aa993b | 251 | static void go32_files_info (struct target_ops *target); |
7d85a9c0 | 252 | static void go32_kill_inferior (struct target_ops *ops); |
136d6dae VP |
253 | static void go32_create_inferior (struct target_ops *ops, char *exec_file, |
254 | char *args, char **env, int from_tty); | |
255 | static void go32_mourn_inferior (struct target_ops *ops); | |
c5aa993b | 256 | static int go32_can_run (void); |
b83266a0 SS |
257 | |
258 | static struct target_ops go32_ops; | |
c5aa993b JM |
259 | static void go32_terminal_init (void); |
260 | static void go32_terminal_inferior (void); | |
261 | static void go32_terminal_ours (void); | |
e49d4fa6 | 262 | |
53a5351d | 263 | #define r_ofs(x) (offsetof(TSS,x)) |
e49d4fa6 SS |
264 | |
265 | static struct | |
266 | { | |
53a5351d JM |
267 | size_t tss_ofs; |
268 | size_t size; | |
e49d4fa6 SS |
269 | } |
270 | regno_mapping[] = | |
271 | { | |
0fff5247 EZ |
272 | {r_ofs (tss_eax), 4}, /* normal registers, from a_tss */ |
273 | {r_ofs (tss_ecx), 4}, | |
274 | {r_ofs (tss_edx), 4}, | |
275 | {r_ofs (tss_ebx), 4}, | |
276 | {r_ofs (tss_esp), 4}, | |
277 | {r_ofs (tss_ebp), 4}, | |
278 | {r_ofs (tss_esi), 4}, | |
279 | {r_ofs (tss_edi), 4}, | |
280 | {r_ofs (tss_eip), 4}, | |
281 | {r_ofs (tss_eflags), 4}, | |
282 | {r_ofs (tss_cs), 2}, | |
283 | {r_ofs (tss_ss), 2}, | |
284 | {r_ofs (tss_ds), 2}, | |
285 | {r_ofs (tss_es), 2}, | |
286 | {r_ofs (tss_fs), 2}, | |
287 | {r_ofs (tss_gs), 2}, | |
288 | {0, 10}, /* 8 FP registers, from npx.reg[] */ | |
289 | {1, 10}, | |
290 | {2, 10}, | |
291 | {3, 10}, | |
292 | {4, 10}, | |
293 | {5, 10}, | |
294 | {6, 10}, | |
295 | {7, 10}, | |
53a5351d | 296 | /* The order of the next 7 registers must be consistent |
0fff5247 EZ |
297 | with their numbering in config/i386/tm-i386.h, which see. */ |
298 | {0, 2}, /* control word, from npx */ | |
299 | {4, 2}, /* status word, from npx */ | |
300 | {8, 2}, /* tag word, from npx */ | |
301 | {16, 2}, /* last FP exception CS from npx */ | |
302 | {12, 4}, /* last FP exception EIP from npx */ | |
303 | {24, 2}, /* last FP exception operand selector from npx */ | |
304 | {20, 4}, /* last FP exception operand offset from npx */ | |
305 | {18, 2} /* last FP opcode from npx */ | |
e49d4fa6 SS |
306 | }; |
307 | ||
308 | static struct | |
309 | { | |
310 | int go32_sig; | |
0fff5247 | 311 | enum target_signal gdb_sig; |
e49d4fa6 SS |
312 | } |
313 | sig_map[] = | |
314 | { | |
0fff5247 EZ |
315 | {0, TARGET_SIGNAL_FPE}, |
316 | {1, TARGET_SIGNAL_TRAP}, | |
53a5351d JM |
317 | /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL, |
318 | but I think SIGBUS is better, since the NMI is usually activated | |
319 | as a result of a memory parity check failure. */ | |
0fff5247 EZ |
320 | {2, TARGET_SIGNAL_BUS}, |
321 | {3, TARGET_SIGNAL_TRAP}, | |
322 | {4, TARGET_SIGNAL_FPE}, | |
323 | {5, TARGET_SIGNAL_SEGV}, | |
324 | {6, TARGET_SIGNAL_ILL}, | |
325 | {7, TARGET_SIGNAL_EMT}, /* no-coprocessor exception */ | |
326 | {8, TARGET_SIGNAL_SEGV}, | |
327 | {9, TARGET_SIGNAL_SEGV}, | |
328 | {10, TARGET_SIGNAL_BUS}, | |
329 | {11, TARGET_SIGNAL_SEGV}, | |
330 | {12, TARGET_SIGNAL_SEGV}, | |
331 | {13, TARGET_SIGNAL_SEGV}, | |
332 | {14, TARGET_SIGNAL_SEGV}, | |
333 | {16, TARGET_SIGNAL_FPE}, | |
334 | {17, TARGET_SIGNAL_BUS}, | |
335 | {31, TARGET_SIGNAL_ILL}, | |
336 | {0x1b, TARGET_SIGNAL_INT}, | |
337 | {0x75, TARGET_SIGNAL_FPE}, | |
338 | {0x78, TARGET_SIGNAL_ALRM}, | |
339 | {0x79, TARGET_SIGNAL_INT}, | |
340 | {0x7a, TARGET_SIGNAL_QUIT}, | |
341 | {-1, TARGET_SIGNAL_LAST} | |
e49d4fa6 SS |
342 | }; |
343 | ||
53a5351d JM |
344 | static struct { |
345 | enum target_signal gdb_sig; | |
346 | int djgpp_excepno; | |
347 | } excepn_map[] = { | |
0fff5247 EZ |
348 | {TARGET_SIGNAL_0, -1}, |
349 | {TARGET_SIGNAL_ILL, 6}, /* Invalid Opcode */ | |
350 | {TARGET_SIGNAL_EMT, 7}, /* triggers SIGNOFP */ | |
351 | {TARGET_SIGNAL_SEGV, 13}, /* GPF */ | |
352 | {TARGET_SIGNAL_BUS, 17}, /* Alignment Check */ | |
53a5351d JM |
353 | /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for |
354 | details. */ | |
0fff5247 EZ |
355 | {TARGET_SIGNAL_TERM, 0x1b}, /* triggers Ctrl-Break type of SIGINT */ |
356 | {TARGET_SIGNAL_FPE, 0x75}, | |
357 | {TARGET_SIGNAL_INT, 0x79}, | |
358 | {TARGET_SIGNAL_QUIT, 0x7a}, | |
359 | {TARGET_SIGNAL_ALRM, 0x78}, /* triggers SIGTIMR */ | |
360 | {TARGET_SIGNAL_PROF, 0x78}, | |
361 | {TARGET_SIGNAL_LAST, -1} | |
53a5351d JM |
362 | }; |
363 | ||
e49d4fa6 | 364 | static void |
4d277981 | 365 | go32_open (char *name, int from_tty) |
e49d4fa6 | 366 | { |
53a5351d | 367 | printf_unfiltered ("Done. Use the \"run\" command to run the program.\n"); |
e49d4fa6 SS |
368 | } |
369 | ||
370 | static void | |
4d277981 | 371 | go32_close (int quitting) |
e49d4fa6 SS |
372 | { |
373 | } | |
374 | ||
375 | static void | |
136d6dae | 376 | go32_attach (struct target_ops *ops, char *args, int from_tty) |
e49d4fa6 | 377 | { |
8a3fe4f8 | 378 | error (_("\ |
53a5351d | 379 | You cannot attach to a running program on this platform.\n\ |
8a3fe4f8 | 380 | Use the `run' command to run DJGPP programs.")); |
e49d4fa6 SS |
381 | } |
382 | ||
383 | static void | |
136d6dae | 384 | go32_detach (struct target_ops *ops, char *args, int from_tty) |
e49d4fa6 SS |
385 | { |
386 | } | |
387 | ||
388 | static int resume_is_step; | |
53a5351d | 389 | static int resume_signal = -1; |
e49d4fa6 SS |
390 | |
391 | static void | |
28439f5e PA |
392 | go32_resume (struct target_ops *ops, |
393 | ptid_t ptid, int step, enum target_signal siggnal) | |
c5aa993b | 394 | { |
53a5351d JM |
395 | int i; |
396 | ||
c5aa993b | 397 | resume_is_step = step; |
53a5351d JM |
398 | |
399 | if (siggnal != TARGET_SIGNAL_0 && siggnal != TARGET_SIGNAL_TRAP) | |
400 | { | |
0fff5247 EZ |
401 | for (i = 0, resume_signal = -1; |
402 | excepn_map[i].gdb_sig != TARGET_SIGNAL_LAST; i++) | |
53a5351d JM |
403 | if (excepn_map[i].gdb_sig == siggnal) |
404 | { | |
405 | resume_signal = excepn_map[i].djgpp_excepno; | |
406 | break; | |
407 | } | |
408 | if (resume_signal == -1) | |
409 | printf_unfiltered ("Cannot deliver signal %s on this platform.\n", | |
410 | target_signal_to_name (siggnal)); | |
411 | } | |
c5aa993b | 412 | } |
e49d4fa6 | 413 | |
53a5351d JM |
414 | static char child_cwd[FILENAME_MAX]; |
415 | ||
31616044 | 416 | static ptid_t |
117de6a9 PA |
417 | go32_wait (struct target_ops *ops, |
418 | ptid_t ptid, struct target_waitstatus *status) | |
e49d4fa6 SS |
419 | { |
420 | int i; | |
53a5351d | 421 | unsigned char saved_opcode; |
0fff5247 | 422 | unsigned long INT3_addr = 0; |
53a5351d | 423 | int stepping_over_INT = 0; |
e49d4fa6 | 424 | |
53a5351d | 425 | a_tss.tss_eflags &= 0xfeff; /* reset the single-step flag (TF) */ |
e49d4fa6 | 426 | if (resume_is_step) |
53a5351d JM |
427 | { |
428 | /* If the next instruction is INT xx or INTO, we need to handle | |
429 | them specially. Intel manuals say that these instructions | |
430 | reset the single-step flag (a.k.a. TF). However, it seems | |
431 | that, at least in the DPMI environment, and at least when | |
432 | stepping over the DPMI interrupt 31h, the problem is having | |
433 | TF set at all when INT 31h is executed: the debuggee either | |
434 | crashes (and takes the system with it) or is killed by a | |
435 | SIGTRAP. | |
436 | ||
437 | So we need to emulate single-step mode: we put an INT3 opcode | |
438 | right after the INT xx instruction, let the debuggee run | |
439 | until it hits INT3 and stops, then restore the original | |
440 | instruction which we overwrote with the INT3 opcode, and back | |
441 | up the debuggee's EIP to that instruction. */ | |
442 | read_child (a_tss.tss_eip, &saved_opcode, 1); | |
443 | if (saved_opcode == 0xCD || saved_opcode == 0xCE) | |
444 | { | |
445 | unsigned char INT3_opcode = 0xCC; | |
446 | ||
447 | INT3_addr | |
448 | = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1; | |
449 | stepping_over_INT = 1; | |
450 | read_child (INT3_addr, &saved_opcode, 1); | |
451 | write_child (INT3_addr, &INT3_opcode, 1); | |
452 | } | |
453 | else | |
454 | a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */ | |
455 | } | |
456 | ||
457 | /* The special value FFFFh in tss_trap indicates to run_child that | |
458 | tss_irqn holds a signal to be delivered to the debuggee. */ | |
459 | if (resume_signal <= -1) | |
460 | { | |
461 | a_tss.tss_trap = 0; | |
462 | a_tss.tss_irqn = 0xff; | |
463 | } | |
e49d4fa6 | 464 | else |
53a5351d JM |
465 | { |
466 | a_tss.tss_trap = 0xffff; /* run_child looks for this */ | |
467 | a_tss.tss_irqn = resume_signal; | |
468 | } | |
469 | ||
470 | /* The child might change working directory behind our back. The | |
471 | GDB users won't like the side effects of that when they work with | |
472 | relative file names, and GDB might be confused by its current | |
473 | directory not being in sync with the truth. So we always make a | |
474 | point of changing back to where GDB thinks is its cwd, when we | |
475 | return control to the debugger, but restore child's cwd before we | |
476 | run it. */ | |
3a45aed8 EZ |
477 | /* Initialize child_cwd, before the first call to run_child and not |
478 | in the initialization, so the child get also the changed directory | |
479 | set with the gdb-command "cd ..." */ | |
480 | if (!*child_cwd) | |
481 | /* Initialize child's cwd with the current one. */ | |
482 | getcwd (child_cwd, sizeof (child_cwd)); | |
4d277981 | 483 | |
53a5351d | 484 | chdir (child_cwd); |
e49d4fa6 | 485 | |
b83266a0 | 486 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 487 | load_npx (); |
b83266a0 | 488 | #endif |
e49d4fa6 | 489 | run_child (); |
b83266a0 | 490 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 491 | save_npx (); |
b83266a0 | 492 | #endif |
e49d4fa6 | 493 | |
53a5351d JM |
494 | /* Did we step over an INT xx instruction? */ |
495 | if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1) | |
496 | { | |
497 | /* Restore the original opcode. */ | |
498 | a_tss.tss_eip--; /* EIP points *after* the INT3 instruction */ | |
499 | write_child (a_tss.tss_eip, &saved_opcode, 1); | |
500 | /* Simulate a TRAP exception. */ | |
501 | a_tss.tss_irqn = 1; | |
502 | a_tss.tss_eflags |= 0x0100; | |
503 | } | |
504 | ||
505 | getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */ | |
506 | chdir (current_directory); | |
507 | ||
e49d4fa6 SS |
508 | if (a_tss.tss_irqn == 0x21) |
509 | { | |
510 | status->kind = TARGET_WAITKIND_EXITED; | |
511 | status->value.integer = a_tss.tss_eax & 0xff; | |
512 | } | |
513 | else | |
514 | { | |
515 | status->value.sig = TARGET_SIGNAL_UNKNOWN; | |
516 | status->kind = TARGET_WAITKIND_STOPPED; | |
517 | for (i = 0; sig_map[i].go32_sig != -1; i++) | |
518 | { | |
519 | if (a_tss.tss_irqn == sig_map[i].go32_sig) | |
520 | { | |
53a5351d | 521 | #if __DJGPP_MINOR__ < 3 |
e49d4fa6 SS |
522 | if ((status->value.sig = sig_map[i].gdb_sig) != |
523 | TARGET_SIGNAL_TRAP) | |
524 | status->kind = TARGET_WAITKIND_SIGNALLED; | |
53a5351d JM |
525 | #else |
526 | status->value.sig = sig_map[i].gdb_sig; | |
527 | #endif | |
e49d4fa6 SS |
528 | break; |
529 | } | |
530 | } | |
531 | } | |
31616044 | 532 | return pid_to_ptid (SOME_PID); |
e49d4fa6 SS |
533 | } |
534 | ||
535 | static void | |
56be3814 | 536 | fetch_register (struct regcache *regcache, int regno) |
e49d4fa6 | 537 | { |
9d0b3624 PA |
538 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
539 | if (regno < gdbarch_fp0_regnum (gdbarch)) | |
56be3814 | 540 | regcache_raw_supply (regcache, regno, |
23a6d369 | 541 | (char *) &a_tss + regno_mapping[regno].tss_ofs); |
9d0b3624 | 542 | else if (i386_fp_regnum_p (gdbarch, regno) || i386_fpc_regnum_p (gdbarch, regno)) |
56be3814 | 543 | i387_supply_fsave (regcache, regno, &npx); |
89dea5aa EZ |
544 | else |
545 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 546 | _("Invalid register no. %d in fetch_register."), regno); |
89dea5aa | 547 | } |
e49d4fa6 | 548 | |
89dea5aa | 549 | static void |
28439f5e PA |
550 | go32_fetch_registers (struct target_ops *ops, |
551 | struct regcache *regcache, int regno) | |
89dea5aa EZ |
552 | { |
553 | if (regno >= 0) | |
56be3814 | 554 | fetch_register (regcache, regno); |
89dea5aa | 555 | else |
e49d4fa6 | 556 | { |
7067c689 UW |
557 | for (regno = 0; |
558 | regno < gdbarch_fp0_regnum (get_regcache_arch (regcache)); | |
559 | regno++) | |
56be3814 UW |
560 | fetch_register (regcache, regno); |
561 | i387_supply_fsave (regcache, -1, &npx); | |
e49d4fa6 SS |
562 | } |
563 | } | |
564 | ||
565 | static void | |
56be3814 | 566 | store_register (const struct regcache *regcache, int regno) |
e49d4fa6 | 567 | { |
9d0b3624 PA |
568 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
569 | if (regno < gdbarch_fp0_regnum (gdbarch)) | |
56be3814 | 570 | regcache_raw_collect (regcache, regno, |
822c9732 | 571 | (char *) &a_tss + regno_mapping[regno].tss_ofs); |
9d0b3624 | 572 | else if (i386_fp_regnum_p (gdbarch, regno) || i386_fpc_regnum_p (gdbarch, regno)) |
56be3814 | 573 | i387_collect_fsave (regcache, regno, &npx); |
e49d4fa6 | 574 | else |
8e65ff28 | 575 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 576 | _("Invalid register no. %d in store_register."), regno); |
e49d4fa6 SS |
577 | } |
578 | ||
579 | static void | |
28439f5e PA |
580 | go32_store_registers (struct target_ops *ops, |
581 | struct regcache *regcache, int regno) | |
e49d4fa6 | 582 | { |
0fff5247 | 583 | unsigned r; |
e49d4fa6 SS |
584 | |
585 | if (regno >= 0) | |
56be3814 | 586 | store_register (regcache, regno); |
e49d4fa6 SS |
587 | else |
588 | { | |
7067c689 | 589 | for (r = 0; r < gdbarch_fp0_regnum (get_regcache_arch (regcache)); r++) |
56be3814 UW |
590 | store_register (regcache, r); |
591 | i387_collect_fsave (regcache, -1, &npx); | |
e49d4fa6 SS |
592 | } |
593 | } | |
594 | ||
595 | static void | |
316f2060 | 596 | go32_prepare_to_store (struct regcache *regcache) |
e49d4fa6 SS |
597 | { |
598 | } | |
599 | ||
600 | static int | |
9d0b3624 | 601 | go32_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, int write, |
4d277981 | 602 | struct mem_attrib *attrib, struct target_ops *target) |
e49d4fa6 SS |
603 | { |
604 | if (write) | |
605 | { | |
606 | if (write_child (memaddr, myaddr, len)) | |
607 | { | |
608 | return 0; | |
609 | } | |
610 | else | |
611 | { | |
612 | return len; | |
613 | } | |
614 | } | |
615 | else | |
616 | { | |
617 | if (read_child (memaddr, myaddr, len)) | |
618 | { | |
619 | return 0; | |
620 | } | |
621 | else | |
622 | { | |
623 | return len; | |
624 | } | |
625 | } | |
626 | } | |
627 | ||
53a5351d JM |
628 | static cmdline_t child_cmd; /* parsed child's command line kept here */ |
629 | ||
e49d4fa6 | 630 | static void |
4d277981 | 631 | go32_files_info (struct target_ops *target) |
e49d4fa6 | 632 | { |
53a5351d | 633 | printf_unfiltered ("You are running a DJGPP V2 program.\n"); |
e49d4fa6 SS |
634 | } |
635 | ||
e49d4fa6 | 636 | static void |
7d85a9c0 | 637 | go32_kill_inferior (struct target_ops *ops) |
e49d4fa6 | 638 | { |
67ce33d7 | 639 | go32_mourn_inferior (ops); |
e49d4fa6 SS |
640 | } |
641 | ||
642 | static void | |
267fbcde JB |
643 | go32_create_inferior (struct target_ops *ops, char *exec_file, |
644 | char *args, char **env, int from_tty) | |
e49d4fa6 | 645 | { |
4d277981 | 646 | extern char **environ; |
e49d4fa6 SS |
647 | jmp_buf start_state; |
648 | char *cmdline; | |
649 | char **env_save = environ; | |
150985e3 | 650 | size_t cmdlen; |
e49d4fa6 | 651 | |
0fff5247 EZ |
652 | /* If no exec file handed to us, get it from the exec-file command -- with |
653 | a good, common error message if none is specified. */ | |
654 | if (exec_file == 0) | |
655 | exec_file = get_exec_file (1); | |
656 | ||
53a5351d JM |
657 | resume_signal = -1; |
658 | resume_is_step = 0; | |
3a45aed8 EZ |
659 | |
660 | /* Initialize child's cwd as empty to be initialized when starting | |
661 | the child. */ | |
662 | *child_cwd = 0; | |
663 | ||
53a5351d JM |
664 | /* Init command line storage. */ |
665 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 | 666 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 667 | _("Cannot allocate redirection storage: 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 | |
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); |
7f9f62ba PA |
716 | add_inferior_silent (SOME_PID); |
717 | ||
e49d4fa6 | 718 | push_target (&go32_ops); |
444c3224 PA |
719 | |
720 | add_thread_silent (inferior_ptid); | |
721 | ||
e49d4fa6 SS |
722 | clear_proceed_status (); |
723 | insert_breakpoints (); | |
b83266a0 | 724 | prog_has_started = 1; |
e49d4fa6 SS |
725 | } |
726 | ||
727 | static void | |
136d6dae | 728 | go32_mourn_inferior (struct target_ops *ops) |
e49d4fa6 | 729 | { |
67ce33d7 PA |
730 | ptid_t ptid; |
731 | ||
732 | redir_cmdline_delete (&child_cmd); | |
733 | resume_signal = -1; | |
734 | resume_is_step = 0; | |
735 | ||
736 | cleanup_client (); | |
737 | ||
53a5351d JM |
738 | /* We need to make sure all the breakpoint enable bits in the DR7 |
739 | register are reset when the inferior exits. Otherwise, if they | |
740 | rerun the inferior, the uncleared bits may cause random SIGTRAPs, | |
741 | failure to set more watchpoints, and other calamities. It would | |
742 | be nice if GDB itself would take care to remove all breakpoints | |
743 | at all times, but it doesn't, probably under an assumption that | |
744 | the OS cleans up when the debuggee exits. */ | |
e24d4c64 | 745 | i386_cleanup_dregs (); |
67ce33d7 PA |
746 | |
747 | ptid = inferior_ptid; | |
748 | inferior_ptid = null_ptid; | |
749 | delete_thread_silent (ptid); | |
750 | prog_has_started = 0; | |
751 | ||
752 | unpush_target (ops); | |
e49d4fa6 SS |
753 | generic_mourn_inferior (); |
754 | } | |
755 | ||
756 | static int | |
757 | go32_can_run (void) | |
758 | { | |
759 | return 1; | |
760 | } | |
761 | ||
e49d4fa6 SS |
762 | /* Hardware watchpoint support. */ |
763 | ||
e49d4fa6 | 764 | #define D_REGS edi.dr |
e24d4c64 EZ |
765 | #define CONTROL D_REGS[7] |
766 | #define STATUS D_REGS[6] | |
53a5351d | 767 | |
e24d4c64 EZ |
768 | /* Pass the address ADDR to the inferior in the I'th debug register. |
769 | Here we just store the address in D_REGS, the watchpoint will be | |
770 | actually set up when go32_wait runs the debuggee. */ | |
771 | void | |
772 | go32_set_dr (int i, CORE_ADDR addr) | |
e49d4fa6 | 773 | { |
4d277981 EZ |
774 | if (i < 0 || i > 3) |
775 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 776 | _("Invalid register %d in go32_set_dr.\n"), i); |
e24d4c64 | 777 | D_REGS[i] = addr; |
e49d4fa6 SS |
778 | } |
779 | ||
e24d4c64 EZ |
780 | /* Pass the value VAL to the inferior in the DR7 debug control |
781 | register. Here we just store the address in D_REGS, the watchpoint | |
782 | will be actually set up when go32_wait runs the debuggee. */ | |
783 | void | |
784 | go32_set_dr7 (unsigned val) | |
53a5351d | 785 | { |
e24d4c64 | 786 | CONTROL = val; |
53a5351d JM |
787 | } |
788 | ||
e24d4c64 EZ |
789 | /* Get the value of the DR6 debug status register from the inferior. |
790 | Here we just return the value stored in D_REGS, as we've got it | |
791 | from the last go32_wait call. */ | |
792 | unsigned | |
793 | go32_get_dr6 (void) | |
e49d4fa6 | 794 | { |
e24d4c64 | 795 | return STATUS; |
e49d4fa6 SS |
796 | } |
797 | ||
53a5351d JM |
798 | /* Put the device open on handle FD into either raw or cooked |
799 | mode, return 1 if it was in raw mode, zero otherwise. */ | |
800 | ||
801 | static int | |
802 | device_mode (int fd, int raw_p) | |
803 | { | |
804 | int oldmode, newmode; | |
805 | __dpmi_regs regs; | |
806 | ||
807 | regs.x.ax = 0x4400; | |
808 | regs.x.bx = fd; | |
809 | __dpmi_int (0x21, ®s); | |
810 | if (regs.x.flags & 1) | |
811 | return -1; | |
812 | newmode = oldmode = regs.x.dx; | |
813 | ||
814 | if (raw_p) | |
815 | newmode |= 0x20; | |
816 | else | |
817 | newmode &= ~0x20; | |
818 | ||
819 | if (oldmode & 0x80) /* Only for character dev */ | |
820 | { | |
821 | regs.x.ax = 0x4401; | |
822 | regs.x.bx = fd; | |
823 | regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails */ | |
824 | __dpmi_int (0x21, ®s); | |
825 | if (regs.x.flags & 1) | |
826 | return -1; | |
827 | } | |
828 | return (oldmode & 0x20) == 0x20; | |
829 | } | |
830 | ||
831 | ||
832 | static int inf_mode_valid = 0; | |
833 | static int inf_terminal_mode; | |
834 | ||
835 | /* This semaphore is needed because, amazingly enough, GDB calls | |
836 | target.to_terminal_ours more than once after the inferior stops. | |
837 | But we need the information from the first call only, since the | |
838 | second call will always see GDB's own cooked terminal. */ | |
839 | static int terminal_is_ours = 1; | |
840 | ||
cce74817 JM |
841 | static void |
842 | go32_terminal_init (void) | |
843 | { | |
53a5351d JM |
844 | inf_mode_valid = 0; /* reinitialize, in case they are restarting child */ |
845 | terminal_is_ours = 1; | |
cce74817 JM |
846 | } |
847 | ||
848 | static void | |
4d277981 | 849 | go32_terminal_info (char *args, int from_tty) |
cce74817 | 850 | { |
53a5351d JM |
851 | printf_unfiltered ("Inferior's terminal is in %s mode.\n", |
852 | !inf_mode_valid | |
853 | ? "default" : inf_terminal_mode ? "raw" : "cooked"); | |
854 | ||
855 | #if __DJGPP_MINOR__ > 2 | |
856 | if (child_cmd.redirection) | |
857 | { | |
858 | int i; | |
859 | ||
860 | for (i = 0; i < DBG_HANDLES; i++) | |
c5aa993b | 861 | { |
53a5351d JM |
862 | if (child_cmd.redirection[i]->file_name) |
863 | printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n", | |
864 | i, child_cmd.redirection[i]->file_name); | |
865 | else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1) | |
866 | printf_unfiltered | |
867 | ("\tFile handle %d appears to be closed by inferior.\n", i); | |
868 | /* Mask off the raw/cooked bit when comparing device info words. */ | |
869 | else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf) | |
870 | != (_get_dev_info (i) & 0xdf)) | |
871 | printf_unfiltered | |
872 | ("\tFile handle %d appears to be redirected by inferior.\n", i); | |
c5aa993b | 873 | } |
53a5351d JM |
874 | } |
875 | #endif | |
876 | } | |
877 | ||
878 | static void | |
879 | go32_terminal_inferior (void) | |
880 | { | |
881 | /* Redirect standard handles as child wants them. */ | |
882 | errno = 0; | |
883 | if (redir_to_child (&child_cmd) == -1) | |
884 | { | |
885 | redir_to_debugger (&child_cmd); | |
8a3fe4f8 | 886 | error (_("Cannot redirect standard handles for program: %s."), |
dc672865 | 887 | safe_strerror (errno)); |
53a5351d JM |
888 | } |
889 | /* set the console device of the inferior to whatever mode | |
890 | (raw or cooked) we found it last time */ | |
891 | if (terminal_is_ours) | |
892 | { | |
893 | if (inf_mode_valid) | |
894 | device_mode (0, inf_terminal_mode); | |
895 | terminal_is_ours = 0; | |
896 | } | |
cce74817 JM |
897 | } |
898 | ||
899 | static void | |
900 | go32_terminal_ours (void) | |
901 | { | |
53a5351d JM |
902 | /* Switch to cooked mode on the gdb terminal and save the inferior |
903 | terminal mode to be restored when it is resumed */ | |
904 | if (!terminal_is_ours) | |
905 | { | |
906 | inf_terminal_mode = device_mode (0, 0); | |
907 | if (inf_terminal_mode != -1) | |
908 | inf_mode_valid = 1; | |
909 | else | |
910 | /* If device_mode returned -1, we don't know what happens with | |
911 | handle 0 anymore, so make the info invalid. */ | |
912 | inf_mode_valid = 0; | |
913 | terminal_is_ours = 1; | |
914 | ||
915 | /* Restore debugger's standard handles. */ | |
916 | errno = 0; | |
917 | if (redir_to_debugger (&child_cmd) == -1) | |
918 | { | |
919 | redir_to_child (&child_cmd); | |
8a3fe4f8 | 920 | error (_("Cannot redirect standard handles for debugger: %s."), |
dc672865 | 921 | safe_strerror (errno)); |
53a5351d JM |
922 | } |
923 | } | |
cce74817 JM |
924 | } |
925 | ||
444c3224 | 926 | static int |
28439f5e | 927 | go32_thread_alive (struct target_ops *ops, ptid_t ptid) |
444c3224 | 928 | { |
89c9c2ec | 929 | return !ptid_equal (inferior_ptid, null_ptid); |
444c3224 PA |
930 | } |
931 | ||
932 | static char * | |
117de6a9 | 933 | go32_pid_to_str (struct target_ops *ops, ptid_t ptid) |
444c3224 | 934 | { |
89c9c2ec | 935 | return normal_pid_to_str (ptid); |
444c3224 PA |
936 | } |
937 | ||
e49d4fa6 SS |
938 | static void |
939 | init_go32_ops (void) | |
940 | { | |
941 | go32_ops.to_shortname = "djgpp"; | |
942 | go32_ops.to_longname = "djgpp target process"; | |
943 | go32_ops.to_doc = | |
944 | "Program loaded by djgpp, when gdb is used as an external debugger"; | |
945 | go32_ops.to_open = go32_open; | |
946 | go32_ops.to_close = go32_close; | |
53a5351d | 947 | go32_ops.to_attach = go32_attach; |
e49d4fa6 SS |
948 | go32_ops.to_detach = go32_detach; |
949 | go32_ops.to_resume = go32_resume; | |
950 | go32_ops.to_wait = go32_wait; | |
951 | go32_ops.to_fetch_registers = go32_fetch_registers; | |
952 | go32_ops.to_store_registers = go32_store_registers; | |
953 | go32_ops.to_prepare_to_store = go32_prepare_to_store; | |
c8e73a31 | 954 | go32_ops.deprecated_xfer_memory = go32_xfer_memory; |
e49d4fa6 SS |
955 | go32_ops.to_files_info = go32_files_info; |
956 | go32_ops.to_insert_breakpoint = memory_insert_breakpoint; | |
957 | go32_ops.to_remove_breakpoint = memory_remove_breakpoint; | |
cce74817 JM |
958 | go32_ops.to_terminal_init = go32_terminal_init; |
959 | go32_ops.to_terminal_inferior = go32_terminal_inferior; | |
53a5351d | 960 | go32_ops.to_terminal_ours_for_output = go32_terminal_ours; |
cce74817 | 961 | go32_ops.to_terminal_ours = go32_terminal_ours; |
53a5351d | 962 | go32_ops.to_terminal_info = go32_terminal_info; |
e49d4fa6 SS |
963 | go32_ops.to_kill = go32_kill_inferior; |
964 | go32_ops.to_create_inferior = go32_create_inferior; | |
965 | go32_ops.to_mourn_inferior = go32_mourn_inferior; | |
966 | go32_ops.to_can_run = go32_can_run; | |
444c3224 PA |
967 | go32_ops.to_thread_alive = go32_thread_alive; |
968 | go32_ops.to_pid_to_str = go32_pid_to_str; | |
e49d4fa6 SS |
969 | go32_ops.to_stratum = process_stratum; |
970 | go32_ops.to_has_all_memory = 1; | |
971 | go32_ops.to_has_memory = 1; | |
972 | go32_ops.to_has_stack = 1; | |
973 | go32_ops.to_has_registers = 1; | |
974 | go32_ops.to_has_execution = 1; | |
5aca5a82 PM |
975 | |
976 | i386_use_watchpoints (&go32_ops); | |
977 | ||
e49d4fa6 | 978 | go32_ops.to_magic = OPS_MAGIC; |
53a5351d | 979 | |
3a45aed8 EZ |
980 | /* Initialize child's cwd as empty to be initialized when starting |
981 | the child. */ | |
982 | *child_cwd = 0; | |
53a5351d JM |
983 | |
984 | /* Initialize child's command line storage. */ | |
985 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 | 986 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 987 | _("Cannot allocate redirection storage: not enough memory.\n")); |
0fff5247 EZ |
988 | |
989 | /* We are always processing GCC-compiled programs. */ | |
990 | processing_gcc_compilation = 2; | |
eaae3919 EZ |
991 | |
992 | /* Override the default name of the GDB init file. */ | |
993 | strcpy (gdbinit, "gdb.ini"); | |
e49d4fa6 SS |
994 | } |
995 | ||
10085bb5 EZ |
996 | /* Return the current DOS codepage number. */ |
997 | static int | |
998 | dos_codepage (void) | |
999 | { | |
1000 | __dpmi_regs regs; | |
1001 | ||
1002 | regs.x.ax = 0x6601; | |
1003 | __dpmi_int (0x21, ®s); | |
1004 | if (!(regs.x.flags & 1)) | |
1005 | return regs.x.bx & 0xffff; | |
1006 | else | |
1007 | return 437; /* default */ | |
1008 | } | |
1009 | ||
1010 | /* Limited emulation of `nl_langinfo', for charset.c. */ | |
1011 | char * | |
1012 | nl_langinfo (nl_item item) | |
1013 | { | |
1014 | char *retval; | |
1015 | ||
1016 | switch (item) | |
1017 | { | |
1018 | case CODESET: | |
1019 | { | |
1020 | /* 8 is enough for SHORT_MAX + "CP" + null. */ | |
1021 | char buf[8]; | |
1022 | int blen = sizeof (buf); | |
1023 | int needed = snprintf (buf, blen, "CP%d", dos_codepage ()); | |
1024 | ||
1025 | if (needed > blen) /* should never happen */ | |
1026 | buf[0] = 0; | |
1027 | retval = xstrdup (buf); | |
1028 | } | |
1029 | break; | |
1030 | default: | |
1031 | retval = xstrdup (""); | |
1032 | break; | |
1033 | } | |
1034 | return retval; | |
1035 | } | |
1036 | ||
10ba702d EZ |
1037 | unsigned short windows_major, windows_minor; |
1038 | ||
1039 | /* Compute the version Windows reports via Int 2Fh/AX=1600h. */ | |
1040 | static void | |
1041 | go32_get_windows_version(void) | |
1042 | { | |
1043 | __dpmi_regs r; | |
1044 | ||
1045 | r.x.ax = 0x1600; | |
1046 | __dpmi_int(0x2f, &r); | |
1047 | if (r.h.al > 2 && r.h.al != 0x80 && r.h.al != 0xff | |
1048 | && (r.h.al > 3 || r.h.ah > 0)) | |
1049 | { | |
1050 | windows_major = r.h.al; | |
1051 | windows_minor = r.h.ah; | |
1052 | } | |
1053 | else | |
1054 | windows_major = 0xff; /* meaning no Windows */ | |
1055 | } | |
1056 | ||
1057 | /* A subroutine of go32_sysinfo to display memory info. */ | |
1058 | static void | |
1059 | print_mem (unsigned long datum, const char *header, int in_pages_p) | |
1060 | { | |
1061 | if (datum != 0xffffffffUL) | |
1062 | { | |
1063 | if (in_pages_p) | |
1064 | datum <<= 12; | |
1065 | puts_filtered (header); | |
1066 | if (datum > 1024) | |
1067 | { | |
1068 | printf_filtered ("%lu KB", datum >> 10); | |
1069 | if (datum > 1024 * 1024) | |
1070 | printf_filtered (" (%lu MB)", datum >> 20); | |
1071 | } | |
1072 | else | |
1073 | printf_filtered ("%lu Bytes", datum); | |
1074 | puts_filtered ("\n"); | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | /* Display assorted information about the underlying OS. */ | |
1079 | static void | |
1080 | go32_sysinfo (char *arg, int from_tty) | |
1081 | { | |
d647eed6 EZ |
1082 | static const char test_pattern[] = |
1083 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf" | |
1084 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf" | |
1085 | "deadbeafdeadbeafdeadbeafdeadbeafdeadbeafdeadbeaf"; | |
10ba702d EZ |
1086 | struct utsname u; |
1087 | char cpuid_vendor[13]; | |
1088 | unsigned cpuid_max = 0, cpuid_eax, cpuid_ebx, cpuid_ecx, cpuid_edx; | |
1089 | unsigned true_dos_version = _get_dos_version (1); | |
1090 | unsigned advertized_dos_version = ((unsigned int)_osmajor << 8) | _osminor; | |
1091 | int dpmi_flags; | |
1092 | char dpmi_vendor_info[129]; | |
d647eed6 | 1093 | int dpmi_vendor_available; |
10ba702d EZ |
1094 | __dpmi_version_ret dpmi_version_data; |
1095 | long eflags; | |
1096 | __dpmi_free_mem_info mem_info; | |
1097 | __dpmi_regs regs; | |
1098 | ||
1099 | cpuid_vendor[0] = '\0'; | |
1100 | if (uname (&u)) | |
1101 | strcpy (u.machine, "Unknown x86"); | |
1102 | else if (u.machine[0] == 'i' && u.machine[1] > 4) | |
1103 | { | |
1104 | /* CPUID with EAX = 0 returns the Vendor ID. */ | |
1105 | __asm__ __volatile__ ("xorl %%ebx, %%ebx;" | |
1106 | "xorl %%ecx, %%ecx;" | |
1107 | "xorl %%edx, %%edx;" | |
1108 | "movl $0, %%eax;" | |
1109 | "cpuid;" | |
1110 | "movl %%ebx, %0;" | |
1111 | "movl %%edx, %1;" | |
1112 | "movl %%ecx, %2;" | |
1113 | "movl %%eax, %3;" | |
1114 | : "=m" (cpuid_vendor[0]), | |
1115 | "=m" (cpuid_vendor[4]), | |
1116 | "=m" (cpuid_vendor[8]), | |
1117 | "=m" (cpuid_max) | |
1118 | : | |
1119 | : "%eax", "%ebx", "%ecx", "%edx"); | |
1120 | cpuid_vendor[12] = '\0'; | |
1121 | } | |
1122 | ||
1123 | printf_filtered ("CPU Type.......................%s", u.machine); | |
1124 | if (cpuid_vendor[0]) | |
1125 | printf_filtered (" (%s)", cpuid_vendor); | |
1126 | puts_filtered ("\n"); | |
1127 | ||
1128 | /* CPUID with EAX = 1 returns processor signature and features. */ | |
1129 | if (cpuid_max >= 1) | |
1130 | { | |
1131 | static char *brand_name[] = { | |
1132 | "", | |
1133 | " Celeron", | |
1134 | " III", | |
1135 | " III Xeon", | |
1136 | "", "", "", "", | |
1137 | " 4" | |
1138 | }; | |
1139 | char cpu_string[80]; | |
1140 | char cpu_brand[20]; | |
1141 | unsigned brand_idx; | |
1142 | int intel_p = strcmp (cpuid_vendor, "GenuineIntel") == 0; | |
1143 | int amd_p = strcmp (cpuid_vendor, "AuthenticAMD") == 0; | |
1144 | unsigned cpu_family, cpu_model; | |
1145 | ||
1146 | __asm__ __volatile__ ("movl $1, %%eax;" | |
1147 | "cpuid;" | |
1148 | : "=a" (cpuid_eax), | |
1149 | "=b" (cpuid_ebx), | |
1150 | "=d" (cpuid_edx) | |
1151 | : | |
1152 | : "%ecx"); | |
1153 | brand_idx = cpuid_ebx & 0xff; | |
1154 | cpu_family = (cpuid_eax >> 8) & 0xf; | |
1155 | cpu_model = (cpuid_eax >> 4) & 0xf; | |
1156 | cpu_brand[0] = '\0'; | |
1157 | if (intel_p) | |
1158 | { | |
1159 | if (brand_idx > 0 | |
1160 | && brand_idx < sizeof(brand_name)/sizeof(brand_name[0]) | |
1161 | && *brand_name[brand_idx]) | |
1162 | strcpy (cpu_brand, brand_name[brand_idx]); | |
1163 | else if (cpu_family == 5) | |
1164 | { | |
1165 | if (((cpuid_eax >> 12) & 3) == 0 && cpu_model == 4) | |
1166 | strcpy (cpu_brand, " MMX"); | |
1167 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 1) | |
1168 | strcpy (cpu_brand, " OverDrive"); | |
1169 | else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 2) | |
1170 | strcpy (cpu_brand, " Dual"); | |
1171 | } | |
1172 | else if (cpu_family == 6 && cpu_model < 8) | |
1173 | { | |
1174 | switch (cpu_model) | |
1175 | { | |
1176 | case 1: | |
1177 | strcpy (cpu_brand, " Pro"); | |
1178 | break; | |
1179 | case 3: | |
1180 | strcpy (cpu_brand, " II"); | |
1181 | break; | |
1182 | case 5: | |
1183 | strcpy (cpu_brand, " II Xeon"); | |
1184 | break; | |
1185 | case 6: | |
1186 | strcpy (cpu_brand, " Celeron"); | |
1187 | break; | |
1188 | case 7: | |
1189 | strcpy (cpu_brand, " III"); | |
1190 | break; | |
1191 | } | |
1192 | } | |
1193 | } | |
1194 | else if (amd_p) | |
1195 | { | |
1196 | switch (cpu_family) | |
1197 | { | |
1198 | case 4: | |
1199 | strcpy (cpu_brand, "486/5x86"); | |
1200 | break; | |
1201 | case 5: | |
1202 | switch (cpu_model) | |
1203 | { | |
1204 | case 0: | |
1205 | case 1: | |
1206 | case 2: | |
1207 | case 3: | |
1208 | strcpy (cpu_brand, "-K5"); | |
1209 | break; | |
1210 | case 6: | |
1211 | case 7: | |
1212 | strcpy (cpu_brand, "-K6"); | |
1213 | break; | |
1214 | case 8: | |
1215 | strcpy (cpu_brand, "-K6-2"); | |
1216 | break; | |
1217 | case 9: | |
1218 | strcpy (cpu_brand, "-K6-III"); | |
1219 | break; | |
1220 | } | |
1221 | break; | |
1222 | case 6: | |
1223 | switch (cpu_model) | |
1224 | { | |
1225 | case 1: | |
1226 | case 2: | |
1227 | case 4: | |
1228 | strcpy (cpu_brand, " Athlon"); | |
1229 | break; | |
1230 | case 3: | |
1231 | strcpy (cpu_brand, " Duron"); | |
1232 | break; | |
1233 | } | |
1234 | break; | |
1235 | } | |
1236 | } | |
1237 | sprintf (cpu_string, "%s%s Model %d Stepping %d", | |
1238 | intel_p ? "Pentium" : (amd_p ? "AMD" : "ix86"), | |
1239 | cpu_brand, cpu_model, cpuid_eax & 0xf); | |
1240 | printfi_filtered (31, "%s\n", cpu_string); | |
1241 | if (((cpuid_edx & (6 | (0x0d << 23))) != 0) | |
1242 | || ((cpuid_edx & 1) == 0) | |
1243 | || (amd_p && (cpuid_edx & (3 << 30)) != 0)) | |
1244 | { | |
1245 | puts_filtered ("CPU Features..................."); | |
1246 | /* We only list features which might be useful in the DPMI | |
1247 | environment. */ | |
1248 | if ((cpuid_edx & 1) == 0) | |
1249 | puts_filtered ("No FPU "); /* it's unusual to not have an FPU */ | |
1250 | if ((cpuid_edx & (1 << 1)) != 0) | |
1251 | puts_filtered ("VME "); | |
1252 | if ((cpuid_edx & (1 << 2)) != 0) | |
1253 | puts_filtered ("DE "); | |
1254 | if ((cpuid_edx & (1 << 4)) != 0) | |
1255 | puts_filtered ("TSC "); | |
1256 | if ((cpuid_edx & (1 << 23)) != 0) | |
1257 | puts_filtered ("MMX "); | |
1258 | if ((cpuid_edx & (1 << 25)) != 0) | |
1259 | puts_filtered ("SSE "); | |
1260 | if ((cpuid_edx & (1 << 26)) != 0) | |
1261 | puts_filtered ("SSE2 "); | |
1262 | if (amd_p) | |
1263 | { | |
1264 | if ((cpuid_edx & (1 << 31)) != 0) | |
1265 | puts_filtered ("3DNow! "); | |
1266 | if ((cpuid_edx & (1 << 30)) != 0) | |
1267 | puts_filtered ("3DNow!Ext"); | |
1268 | } | |
1269 | puts_filtered ("\n"); | |
1270 | } | |
1271 | } | |
1272 | puts_filtered ("\n"); | |
1273 | printf_filtered ("DOS Version....................%s %s.%s", | |
1274 | _os_flavor, u.release, u.version); | |
1275 | if (true_dos_version != advertized_dos_version) | |
1276 | printf_filtered (" (disguised as v%d.%d)", _osmajor, _osminor); | |
1277 | puts_filtered ("\n"); | |
1278 | if (!windows_major) | |
1279 | go32_get_windows_version (); | |
1280 | if (windows_major != 0xff) | |
1281 | { | |
1282 | const char *windows_flavor; | |
1283 | ||
1284 | printf_filtered ("Windows Version................%d.%02d (Windows ", | |
1285 | windows_major, windows_minor); | |
1286 | switch (windows_major) | |
1287 | { | |
1288 | case 3: | |
1289 | windows_flavor = "3.X"; | |
1290 | break; | |
1291 | case 4: | |
1292 | switch (windows_minor) | |
1293 | { | |
1294 | case 0: | |
1295 | windows_flavor = "95, 95A, or 95B"; | |
1296 | break; | |
1297 | case 3: | |
1298 | windows_flavor = "95B OSR2.1 or 95C OSR2.5"; | |
1299 | break; | |
1300 | case 10: | |
1301 | windows_flavor = "98 or 98 SE"; | |
1302 | break; | |
1303 | case 90: | |
1304 | windows_flavor = "ME"; | |
1305 | break; | |
1306 | default: | |
1307 | windows_flavor = "9X"; | |
1308 | break; | |
1309 | } | |
1310 | break; | |
1311 | default: | |
1312 | windows_flavor = "??"; | |
1313 | break; | |
1314 | } | |
1315 | printf_filtered ("%s)\n", windows_flavor); | |
1316 | } | |
1317 | else if (true_dos_version == 0x532 && advertized_dos_version == 0x500) | |
541f1105 | 1318 | printf_filtered ("Windows Version................Windows NT family (W2K/XP/W2K3/Vista/W2K8)\n"); |
10ba702d | 1319 | puts_filtered ("\n"); |
d647eed6 EZ |
1320 | /* On some versions of Windows, __dpmi_get_capabilities returns |
1321 | zero, but the buffer is not filled with info, so we fill the | |
1322 | buffer with a known pattern and test for it afterwards. */ | |
1323 | memcpy (dpmi_vendor_info, test_pattern, sizeof(dpmi_vendor_info)); | |
1324 | dpmi_vendor_available = | |
1325 | __dpmi_get_capabilities (&dpmi_flags, dpmi_vendor_info); | |
1326 | if (dpmi_vendor_available == 0 | |
1327 | && memcmp (dpmi_vendor_info, test_pattern, | |
1328 | sizeof(dpmi_vendor_info)) != 0) | |
10ba702d EZ |
1329 | { |
1330 | /* The DPMI spec says the vendor string should be ASCIIZ, but | |
1331 | I don't trust the vendors to follow that... */ | |
1332 | if (!memchr (&dpmi_vendor_info[2], 0, 126)) | |
1333 | dpmi_vendor_info[128] = '\0'; | |
1334 | printf_filtered ("DPMI Host......................%s v%d.%d (capabilities: %#x)\n", | |
1335 | &dpmi_vendor_info[2], | |
1336 | (unsigned)dpmi_vendor_info[0], | |
1337 | (unsigned)dpmi_vendor_info[1], | |
1338 | ((unsigned)dpmi_flags & 0x7f)); | |
1339 | } | |
d647eed6 EZ |
1340 | else |
1341 | printf_filtered ("DPMI Host......................(Info not available)\n"); | |
10ba702d EZ |
1342 | __dpmi_get_version (&dpmi_version_data); |
1343 | printf_filtered ("DPMI Version...................%d.%02d\n", | |
1344 | dpmi_version_data.major, dpmi_version_data.minor); | |
1345 | printf_filtered ("DPMI Info......................%s-bit DPMI, with%s Virtual Memory support\n", | |
1346 | (dpmi_version_data.flags & 1) ? "32" : "16", | |
1347 | (dpmi_version_data.flags & 4) ? "" : "out"); | |
1348 | printfi_filtered (31, "Interrupts reflected to %s mode\n", | |
1349 | (dpmi_version_data.flags & 2) ? "V86" : "Real"); | |
1350 | printfi_filtered (31, "Processor type: i%d86\n", | |
1351 | dpmi_version_data.cpu); | |
1352 | printfi_filtered (31, "PIC base interrupt: Master: %#x Slave: %#x\n", | |
1353 | dpmi_version_data.master_pic, dpmi_version_data.slave_pic); | |
1354 | ||
1355 | /* a_tss is only initialized when the debuggee is first run. */ | |
1356 | if (prog_has_started) | |
1357 | { | |
1358 | __asm__ __volatile__ ("pushfl ; popl %0" : "=g" (eflags)); | |
1359 | printf_filtered ("Protection.....................Ring %d (in %s), with%s I/O protection\n", | |
1360 | a_tss.tss_cs & 3, (a_tss.tss_cs & 4) ? "LDT" : "GDT", | |
1361 | (a_tss.tss_cs & 3) > ((eflags >> 12) & 3) ? "" : "out"); | |
1362 | } | |
1363 | puts_filtered ("\n"); | |
1364 | __dpmi_get_free_memory_information (&mem_info); | |
1365 | print_mem (mem_info.total_number_of_physical_pages, | |
1366 | "DPMI Total Physical Memory.....", 1); | |
1367 | print_mem (mem_info.total_number_of_free_pages, | |
1368 | "DPMI Free Physical Memory......", 1); | |
1369 | print_mem (mem_info.size_of_paging_file_partition_in_pages, | |
1370 | "DPMI Swap Space................", 1); | |
1371 | print_mem (mem_info.linear_address_space_size_in_pages, | |
1372 | "DPMI Total Linear Address Size.", 1); | |
1373 | print_mem (mem_info.free_linear_address_space_in_pages, | |
1374 | "DPMI Free Linear Address Size..", 1); | |
1375 | print_mem (mem_info.largest_available_free_block_in_bytes, | |
1376 | "DPMI Largest Free Memory Block.", 0); | |
1377 | ||
1378 | regs.h.ah = 0x48; | |
1379 | regs.x.bx = 0xffff; | |
1380 | __dpmi_int (0x21, ®s); | |
1381 | print_mem (regs.x.bx << 4, "Free DOS Memory................", 0); | |
1382 | regs.x.ax = 0x5800; | |
1383 | __dpmi_int (0x21, ®s); | |
1384 | if ((regs.x.flags & 1) == 0) | |
1385 | { | |
1386 | static const char *dos_hilo[] = { | |
1387 | "Low", "", "", "", "High", "", "", "", "High, then Low" | |
1388 | }; | |
1389 | static const char *dos_fit[] = { | |
1390 | "First", "Best", "Last" | |
1391 | }; | |
1392 | int hilo_idx = (regs.x.ax >> 4) & 0x0f; | |
1393 | int fit_idx = regs.x.ax & 0x0f; | |
1394 | ||
1395 | if (hilo_idx > 8) | |
1396 | hilo_idx = 0; | |
1397 | if (fit_idx > 2) | |
1398 | fit_idx = 0; | |
1399 | printf_filtered ("DOS Memory Allocation..........%s memory, %s fit\n", | |
1400 | dos_hilo[hilo_idx], dos_fit[fit_idx]); | |
1401 | regs.x.ax = 0x5802; | |
1402 | __dpmi_int (0x21, ®s); | |
1403 | if ((regs.x.flags & 1) != 0) | |
1404 | regs.h.al = 0; | |
1405 | printfi_filtered (31, "UMBs %sin DOS memory chain\n", | |
1406 | regs.h.al == 0 ? "not " : ""); | |
1407 | } | |
1408 | } | |
1409 | ||
1410 | struct seg_descr { | |
9d0b3624 PA |
1411 | unsigned short limit0; |
1412 | unsigned short base0; | |
1413 | unsigned char base1; | |
1414 | unsigned stype:5; | |
1415 | unsigned dpl:2; | |
1416 | unsigned present:1; | |
1417 | unsigned limit1:4; | |
1418 | unsigned available:1; | |
1419 | unsigned dummy:1; | |
1420 | unsigned bit32:1; | |
1421 | unsigned page_granular:1; | |
1422 | unsigned char base2; | |
1423 | } __attribute__ ((packed)); | |
10ba702d EZ |
1424 | |
1425 | struct gate_descr { | |
9d0b3624 PA |
1426 | unsigned short offset0; |
1427 | unsigned short selector; | |
1428 | unsigned param_count:5; | |
1429 | unsigned dummy:3; | |
1430 | unsigned stype:5; | |
1431 | unsigned dpl:2; | |
1432 | unsigned present:1; | |
1433 | unsigned short offset1; | |
1434 | } __attribute__ ((packed)); | |
10ba702d EZ |
1435 | |
1436 | /* Read LEN bytes starting at logical address ADDR, and put the result | |
1437 | into DEST. Return 1 if success, zero if not. */ | |
1438 | static int | |
1439 | read_memory_region (unsigned long addr, void *dest, size_t len) | |
1440 | { | |
1441 | unsigned long dos_ds_limit = __dpmi_get_segment_limit (_dos_ds); | |
9f20bf26 | 1442 | int retval = 1; |
10ba702d EZ |
1443 | |
1444 | /* For the low memory, we can simply use _dos_ds. */ | |
1445 | if (addr <= dos_ds_limit - len) | |
1446 | dosmemget (addr, len, dest); | |
1447 | else | |
1448 | { | |
1449 | /* For memory above 1MB we need to set up a special segment to | |
1450 | be able to access that memory. */ | |
1451 | int sel = __dpmi_allocate_ldt_descriptors (1); | |
1452 | ||
9f20bf26 EZ |
1453 | if (sel <= 0) |
1454 | retval = 0; | |
1455 | else | |
1456 | { | |
1457 | int access_rights = __dpmi_get_descriptor_access_rights (sel); | |
1458 | size_t segment_limit = len - 1; | |
1459 | ||
1460 | /* Make sure the crucial bits in the descriptor access | |
1461 | rights are set correctly. Some DPMI providers might barf | |
1462 | if we set the segment limit to something that is not an | |
1463 | integral multiple of 4KB pages if the granularity bit is | |
1464 | not set to byte-granular, even though the DPMI spec says | |
1465 | it's the host's responsibility to set that bit correctly. */ | |
1466 | if (len > 1024 * 1024) | |
1467 | { | |
1468 | access_rights |= 0x8000; | |
1469 | /* Page-granular segments should have the low 12 bits of | |
1470 | the limit set. */ | |
1471 | segment_limit |= 0xfff; | |
1472 | } | |
1473 | else | |
1474 | access_rights &= ~0x8000; | |
1475 | ||
1476 | if (__dpmi_set_segment_base_address (sel, addr) != -1 | |
1477 | && __dpmi_set_descriptor_access_rights (sel, access_rights) != -1 | |
2033c18a EZ |
1478 | && __dpmi_set_segment_limit (sel, segment_limit) != -1 |
1479 | /* W2K silently fails to set the segment limit, leaving | |
1480 | it at zero; this test avoids the resulting crash. */ | |
1481 | && __dpmi_get_segment_limit (sel) >= segment_limit) | |
9f20bf26 EZ |
1482 | movedata (sel, 0, _my_ds (), (unsigned)dest, len); |
1483 | else | |
1484 | retval = 0; | |
1485 | ||
1486 | __dpmi_free_ldt_descriptor (sel); | |
1487 | } | |
10ba702d | 1488 | } |
9f20bf26 | 1489 | return retval; |
10ba702d EZ |
1490 | } |
1491 | ||
1492 | /* Get a segment descriptor stored at index IDX in the descriptor | |
1493 | table whose base address is TABLE_BASE. Return the descriptor | |
1494 | type, or -1 if failure. */ | |
1495 | static int | |
1496 | get_descriptor (unsigned long table_base, int idx, void *descr) | |
1497 | { | |
1498 | unsigned long addr = table_base + idx * 8; /* 8 bytes per entry */ | |
1499 | ||
1500 | if (read_memory_region (addr, descr, 8)) | |
1501 | return (int)((struct seg_descr *)descr)->stype; | |
1502 | return -1; | |
1503 | } | |
1504 | ||
1505 | struct dtr_reg { | |
1506 | unsigned short limit __attribute__((packed)); | |
1507 | unsigned long base __attribute__((packed)); | |
1508 | }; | |
1509 | ||
1510 | /* Display a segment descriptor stored at index IDX in a descriptor | |
1511 | table whose type is TYPE and whose base address is BASE_ADDR. If | |
1512 | FORCE is non-zero, display even invalid descriptors. */ | |
1513 | static void | |
1514 | display_descriptor (unsigned type, unsigned long base_addr, int idx, int force) | |
1515 | { | |
1516 | struct seg_descr descr; | |
1517 | struct gate_descr gate; | |
1518 | ||
1519 | /* Get the descriptor from the table. */ | |
1520 | if (idx == 0 && type == 0) | |
1521 | puts_filtered ("0x000: null descriptor\n"); | |
1522 | else if (get_descriptor (base_addr, idx, &descr) != -1) | |
1523 | { | |
1524 | /* For each type of descriptor table, this has a bit set if the | |
1525 | corresponding type of selectors is valid in that table. */ | |
1526 | static unsigned allowed_descriptors[] = { | |
1527 | 0xffffdafeL, /* GDT */ | |
1528 | 0x0000c0e0L, /* IDT */ | |
1529 | 0xffffdafaL /* LDT */ | |
1530 | }; | |
1531 | ||
1532 | /* If the program hasn't started yet, assume the debuggee will | |
1533 | have the same CPL as the debugger. */ | |
1534 | int cpl = prog_has_started ? (a_tss.tss_cs & 3) : _my_cs () & 3; | |
1535 | unsigned long limit = (descr.limit1 << 16) | descr.limit0; | |
1536 | ||
1537 | if (descr.present | |
1538 | && (allowed_descriptors[type] & (1 << descr.stype)) != 0) | |
1539 | { | |
1540 | printf_filtered ("0x%03x: ", | |
1541 | type == 1 | |
1542 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); | |
1543 | if (descr.page_granular) | |
1544 | limit = (limit << 12) | 0xfff; /* big segment: low 12 bit set */ | |
1545 | if (descr.stype == 1 || descr.stype == 2 || descr.stype == 3 | |
1546 | || descr.stype == 9 || descr.stype == 11 | |
1547 | || (descr.stype >= 16 && descr.stype < 32)) | |
1548 | printf_filtered ("base=0x%02x%02x%04x limit=0x%08lx", | |
1549 | descr.base2, descr.base1, descr.base0, limit); | |
1550 | ||
1551 | switch (descr.stype) | |
1552 | { | |
1553 | case 1: | |
1554 | case 3: | |
1555 | printf_filtered (" 16-bit TSS (task %sactive)", | |
1556 | descr.stype == 3 ? "" : "in"); | |
1557 | break; | |
1558 | case 2: | |
1559 | puts_filtered (" LDT"); | |
1560 | break; | |
1561 | case 4: | |
1562 | memcpy (&gate, &descr, sizeof gate); | |
1563 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1564 | gate.selector, gate.offset1, gate.offset0); | |
1565 | printf_filtered (" 16-bit Call Gate (params=%d)", | |
1566 | gate.param_count); | |
1567 | break; | |
1568 | case 5: | |
1569 | printf_filtered ("TSS selector=0x%04x", descr.base0); | |
1570 | printfi_filtered (16, "Task Gate"); | |
1571 | break; | |
1572 | case 6: | |
1573 | case 7: | |
1574 | memcpy (&gate, &descr, sizeof gate); | |
1575 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1576 | gate.selector, gate.offset1, gate.offset0); | |
1577 | printf_filtered (" 16-bit %s Gate", | |
1578 | descr.stype == 6 ? "Interrupt" : "Trap"); | |
1579 | break; | |
1580 | case 9: | |
1581 | case 11: | |
1582 | printf_filtered (" 32-bit TSS (task %sactive)", | |
1583 | descr.stype == 3 ? "" : "in"); | |
1584 | break; | |
1585 | case 12: | |
1586 | memcpy (&gate, &descr, sizeof gate); | |
1587 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1588 | gate.selector, gate.offset1, gate.offset0); | |
1589 | printf_filtered (" 32-bit Call Gate (params=%d)", | |
1590 | gate.param_count); | |
1591 | break; | |
1592 | case 14: | |
1593 | case 15: | |
1594 | memcpy (&gate, &descr, sizeof gate); | |
1595 | printf_filtered ("selector=0x%04x offs=0x%04x%04x", | |
1596 | gate.selector, gate.offset1, gate.offset0); | |
1597 | printf_filtered (" 32-bit %s Gate", | |
1598 | descr.stype == 14 ? "Interrupt" : "Trap"); | |
1599 | break; | |
1600 | case 16: /* data segments */ | |
1601 | case 17: | |
1602 | case 18: | |
1603 | case 19: | |
1604 | case 20: | |
1605 | case 21: | |
1606 | case 22: | |
1607 | case 23: | |
1608 | printf_filtered (" %s-bit Data (%s Exp-%s%s)", | |
1609 | descr.bit32 ? "32" : "16", | |
1610 | descr.stype & 2 ? "Read/Write," : "Read-Only, ", | |
1611 | descr.stype & 4 ? "down" : "up", | |
1612 | descr.stype & 1 ? "" : ", N.Acc"); | |
1613 | break; | |
1614 | case 24: /* code segments */ | |
1615 | case 25: | |
1616 | case 26: | |
1617 | case 27: | |
1618 | case 28: | |
1619 | case 29: | |
1620 | case 30: | |
1621 | case 31: | |
1622 | printf_filtered (" %s-bit Code (%s, %sConf%s)", | |
1623 | descr.bit32 ? "32" : "16", | |
1624 | descr.stype & 2 ? "Exec/Read" : "Exec-Only", | |
1625 | descr.stype & 4 ? "" : "N.", | |
1626 | descr.stype & 1 ? "" : ", N.Acc"); | |
1627 | break; | |
1628 | default: | |
1629 | printf_filtered ("Unknown type 0x%02x", descr.stype); | |
1630 | break; | |
1631 | } | |
1632 | puts_filtered ("\n"); | |
1633 | } | |
1634 | else if (force) | |
1635 | { | |
1636 | printf_filtered ("0x%03x: ", | |
1637 | type == 1 | |
1638 | ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); | |
1639 | if (!descr.present) | |
1640 | puts_filtered ("Segment not present\n"); | |
1641 | else | |
1642 | printf_filtered ("Segment type 0x%02x is invalid in this table\n", | |
1643 | descr.stype); | |
1644 | } | |
1645 | } | |
1646 | else if (force) | |
1647 | printf_filtered ("0x%03x: Cannot read this descriptor\n", idx); | |
1648 | } | |
1649 | ||
1650 | static void | |
1651 | go32_sldt (char *arg, int from_tty) | |
1652 | { | |
1653 | struct dtr_reg gdtr; | |
1654 | unsigned short ldtr = 0; | |
1655 | int ldt_idx; | |
1656 | struct seg_descr ldt_descr; | |
1657 | long ldt_entry = -1L; | |
1658 | int cpl = (prog_has_started ? a_tss.tss_cs : _my_cs ()) & 3; | |
1659 | ||
1660 | if (arg && *arg) | |
1661 | { | |
1662 | while (*arg && isspace(*arg)) | |
1663 | arg++; | |
1664 | ||
1665 | if (*arg) | |
1666 | { | |
1667 | ldt_entry = parse_and_eval_long (arg); | |
1668 | if (ldt_entry < 0 | |
1669 | || (ldt_entry & 4) == 0 | |
1670 | || (ldt_entry & 3) != (cpl & 3)) | |
8a3fe4f8 | 1671 | error (_("Invalid LDT entry 0x%03lx."), (unsigned long)ldt_entry); |
10ba702d EZ |
1672 | } |
1673 | } | |
1674 | ||
1675 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1676 | __asm__ __volatile__ ("sldt %0" : "=m" (ldtr) : /* no inputs */ ); | |
1677 | ldt_idx = ldtr / 8; | |
1678 | if (ldt_idx == 0) | |
1679 | puts_filtered ("There is no LDT.\n"); | |
1680 | /* LDT's entry in the GDT must have the type LDT, which is 2. */ | |
1681 | else if (get_descriptor (gdtr.base, ldt_idx, &ldt_descr) != 2) | |
1682 | printf_filtered ("LDT is present (at %#x), but unreadable by GDB.\n", | |
1683 | ldt_descr.base0 | |
1684 | | (ldt_descr.base1 << 16) | |
1685 | | (ldt_descr.base2 << 24)); | |
1686 | else | |
1687 | { | |
1688 | unsigned base = | |
1689 | ldt_descr.base0 | |
1690 | | (ldt_descr.base1 << 16) | |
1691 | | (ldt_descr.base2 << 24); | |
1692 | unsigned limit = ldt_descr.limit0 | (ldt_descr.limit1 << 16); | |
1693 | int max_entry; | |
1694 | ||
1695 | if (ldt_descr.page_granular) | |
1696 | /* Page-granular segments must have the low 12 bits of their | |
1697 | limit set. */ | |
1698 | limit = (limit << 12) | 0xfff; | |
1699 | /* LDT cannot have more than 8K 8-byte entries, i.e. more than | |
1700 | 64KB. */ | |
1701 | if (limit > 0xffff) | |
1702 | limit = 0xffff; | |
1703 | ||
1704 | max_entry = (limit + 1) / 8; | |
1705 | ||
1706 | if (ldt_entry >= 0) | |
1707 | { | |
1708 | if (ldt_entry > limit) | |
8a3fe4f8 | 1709 | error (_("Invalid LDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1710 | (unsigned long)ldt_entry, limit); |
10ba702d EZ |
1711 | |
1712 | display_descriptor (ldt_descr.stype, base, ldt_entry / 8, 1); | |
1713 | } | |
1714 | else | |
1715 | { | |
1716 | int i; | |
1717 | ||
1718 | for (i = 0; i < max_entry; i++) | |
1719 | display_descriptor (ldt_descr.stype, base, i, 0); | |
1720 | } | |
1721 | } | |
1722 | } | |
1723 | ||
1724 | static void | |
1725 | go32_sgdt (char *arg, int from_tty) | |
1726 | { | |
1727 | struct dtr_reg gdtr; | |
1728 | long gdt_entry = -1L; | |
1729 | int max_entry; | |
1730 | ||
1731 | if (arg && *arg) | |
1732 | { | |
1733 | while (*arg && isspace(*arg)) | |
1734 | arg++; | |
1735 | ||
1736 | if (*arg) | |
1737 | { | |
1738 | gdt_entry = parse_and_eval_long (arg); | |
1739 | if (gdt_entry < 0 || (gdt_entry & 7) != 0) | |
8a3fe4f8 | 1740 | error (_("Invalid GDT entry 0x%03lx: not an integral multiple of 8."), |
ccbc3e6f | 1741 | (unsigned long)gdt_entry); |
10ba702d EZ |
1742 | } |
1743 | } | |
1744 | ||
1745 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1746 | max_entry = (gdtr.limit + 1) / 8; | |
1747 | ||
1748 | if (gdt_entry >= 0) | |
1749 | { | |
1750 | if (gdt_entry > gdtr.limit) | |
8a3fe4f8 | 1751 | error (_("Invalid GDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1752 | (unsigned long)gdt_entry, gdtr.limit); |
10ba702d EZ |
1753 | |
1754 | display_descriptor (0, gdtr.base, gdt_entry / 8, 1); | |
1755 | } | |
1756 | else | |
1757 | { | |
1758 | int i; | |
1759 | ||
1760 | for (i = 0; i < max_entry; i++) | |
1761 | display_descriptor (0, gdtr.base, i, 0); | |
1762 | } | |
1763 | } | |
1764 | ||
1765 | static void | |
1766 | go32_sidt (char *arg, int from_tty) | |
1767 | { | |
1768 | struct dtr_reg idtr; | |
1769 | long idt_entry = -1L; | |
1770 | int max_entry; | |
1771 | ||
1772 | if (arg && *arg) | |
1773 | { | |
1774 | while (*arg && isspace(*arg)) | |
1775 | arg++; | |
1776 | ||
1777 | if (*arg) | |
1778 | { | |
1779 | idt_entry = parse_and_eval_long (arg); | |
1780 | if (idt_entry < 0) | |
8a3fe4f8 | 1781 | error (_("Invalid (negative) IDT entry %ld."), idt_entry); |
10ba702d EZ |
1782 | } |
1783 | } | |
1784 | ||
1785 | __asm__ __volatile__ ("sidt %0" : "=m" (idtr) : /* no inputs */ ); | |
1786 | max_entry = (idtr.limit + 1) / 8; | |
1787 | if (max_entry > 0x100) /* no more than 256 entries */ | |
1788 | max_entry = 0x100; | |
1789 | ||
1790 | if (idt_entry >= 0) | |
1791 | { | |
1792 | if (idt_entry > idtr.limit) | |
8a3fe4f8 | 1793 | error (_("Invalid IDT entry %#lx: outside valid limits [0..%#x]"), |
ccbc3e6f | 1794 | (unsigned long)idt_entry, idtr.limit); |
10ba702d EZ |
1795 | |
1796 | display_descriptor (1, idtr.base, idt_entry, 1); | |
1797 | } | |
1798 | else | |
1799 | { | |
1800 | int i; | |
1801 | ||
1802 | for (i = 0; i < max_entry; i++) | |
1803 | display_descriptor (1, idtr.base, i, 0); | |
1804 | } | |
1805 | } | |
1806 | ||
9f20bf26 EZ |
1807 | /* Cached linear address of the base of the page directory. For |
1808 | now, available only under CWSDPMI. Code based on ideas and | |
1809 | suggestions from Charles Sandmann <sandmann@clio.rice.edu>. */ | |
1810 | static unsigned long pdbr; | |
1811 | ||
1812 | static unsigned long | |
1813 | get_cr3 (void) | |
1814 | { | |
1815 | unsigned offset; | |
1816 | unsigned taskreg; | |
1817 | unsigned long taskbase, cr3; | |
1818 | struct dtr_reg gdtr; | |
1819 | ||
1820 | if (pdbr > 0 && pdbr <= 0xfffff) | |
1821 | return pdbr; | |
1822 | ||
1823 | /* Get the linear address of GDT and the Task Register. */ | |
1824 | __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); | |
1825 | __asm__ __volatile__ ("str %0" : "=m" (taskreg) : /* no inputs */ ); | |
1826 | ||
1827 | /* Task Register is a segment selector for the TSS of the current | |
1828 | task. Therefore, it can be used as an index into the GDT to get | |
1829 | at the segment descriptor for the TSS. To get the index, reset | |
1830 | the low 3 bits of the selector (which give the CPL). Add 2 to the | |
1831 | offset to point to the 3 low bytes of the base address. */ | |
1832 | offset = gdtr.base + (taskreg & 0xfff8) + 2; | |
1833 | ||
1834 | ||
1835 | /* CWSDPMI's task base is always under the 1MB mark. */ | |
1836 | if (offset > 0xfffff) | |
1837 | return 0; | |
1838 | ||
1839 | _farsetsel (_dos_ds); | |
1840 | taskbase = _farnspeekl (offset) & 0xffffffU; | |
1841 | taskbase += _farnspeekl (offset + 2) & 0xff000000U; | |
1842 | if (taskbase > 0xfffff) | |
1843 | return 0; | |
1844 | ||
1845 | /* CR3 (a.k.a. PDBR, the Page Directory Base Register) is stored at | |
1846 | offset 1Ch in the TSS. */ | |
1847 | cr3 = _farnspeekl (taskbase + 0x1c) & ~0xfff; | |
1848 | if (cr3 > 0xfffff) | |
1849 | { | |
1f5dc670 | 1850 | #if 0 /* not fullly supported yet */ |
9f20bf26 EZ |
1851 | /* The Page Directory is in UMBs. In that case, CWSDPMI puts |
1852 | the first Page Table right below the Page Directory. Thus, | |
1853 | the first Page Table's entry for its own address and the Page | |
1854 | Directory entry for that Page Table will hold the same | |
1855 | physical address. The loop below searches the entire UMB | |
1856 | range of addresses for such an occurence. */ | |
1857 | unsigned long addr, pte_idx; | |
1858 | ||
1859 | for (addr = 0xb0000, pte_idx = 0xb0; | |
1860 | pte_idx < 0xff; | |
1861 | addr += 0x1000, pte_idx++) | |
1862 | { | |
1863 | if (((_farnspeekl (addr + 4 * pte_idx) & 0xfffff027) == | |
1864 | (_farnspeekl (addr + 0x1000) & 0xfffff027)) | |
1865 | && ((_farnspeekl (addr + 4 * pte_idx + 4) & 0xfffff000) == cr3)) | |
1866 | { | |
1867 | cr3 = addr + 0x1000; | |
1868 | break; | |
1869 | } | |
1870 | } | |
a3b9cbb3 | 1871 | #endif |
9f20bf26 EZ |
1872 | |
1873 | if (cr3 > 0xfffff) | |
1874 | cr3 = 0; | |
1875 | } | |
1876 | ||
1877 | return cr3; | |
1878 | } | |
1879 | ||
1880 | /* Return the N'th Page Directory entry. */ | |
1881 | static unsigned long | |
1882 | get_pde (int n) | |
1883 | { | |
1884 | unsigned long pde = 0; | |
1885 | ||
1886 | if (pdbr && n >= 0 && n < 1024) | |
1887 | { | |
1888 | pde = _farpeekl (_dos_ds, pdbr + 4*n); | |
1889 | } | |
1890 | return pde; | |
1891 | } | |
1892 | ||
1893 | /* Return the N'th entry of the Page Table whose Page Directory entry | |
1894 | is PDE. */ | |
1895 | static unsigned long | |
1896 | get_pte (unsigned long pde, int n) | |
1897 | { | |
1898 | unsigned long pte = 0; | |
1899 | ||
1900 | /* pde & 0x80 tests the 4MB page bit. We don't support 4MB | |
1901 | page tables, for now. */ | |
1902 | if ((pde & 1) && !(pde & 0x80) && n >= 0 && n < 1024) | |
1903 | { | |
1904 | pde &= ~0xfff; /* clear non-address bits */ | |
1905 | pte = _farpeekl (_dos_ds, pde + 4*n); | |
1906 | } | |
1907 | return pte; | |
1908 | } | |
1909 | ||
1910 | /* Display a Page Directory or Page Table entry. IS_DIR, if non-zero, | |
1911 | says this is a Page Directory entry. If FORCE is non-zero, display | |
1912 | the entry even if its Present flag is off. OFF is the offset of the | |
1913 | address from the page's base address. */ | |
1914 | static void | |
1915 | display_ptable_entry (unsigned long entry, int is_dir, int force, unsigned off) | |
1916 | { | |
1917 | if ((entry & 1) != 0) | |
1918 | { | |
1919 | printf_filtered ("Base=0x%05lx000", entry >> 12); | |
1920 | if ((entry & 0x100) && !is_dir) | |
1921 | puts_filtered (" Global"); | |
1922 | if ((entry & 0x40) && !is_dir) | |
1923 | puts_filtered (" Dirty"); | |
1924 | printf_filtered (" %sAcc.", (entry & 0x20) ? "" : "Not-"); | |
1925 | printf_filtered (" %sCached", (entry & 0x10) ? "" : "Not-"); | |
1926 | printf_filtered (" Write-%s", (entry & 8) ? "Thru" : "Back"); | |
1927 | printf_filtered (" %s", (entry & 4) ? "Usr" : "Sup"); | |
1928 | printf_filtered (" Read-%s", (entry & 2) ? "Write" : "Only"); | |
1929 | if (off) | |
1930 | printf_filtered (" +0x%x", off); | |
1931 | puts_filtered ("\n"); | |
1932 | } | |
1933 | else if (force) | |
1934 | printf_filtered ("Page%s not present or not supported; value=0x%lx.\n", | |
1935 | is_dir ? " Table" : "", entry >> 1); | |
1936 | } | |
1937 | ||
1938 | static void | |
1939 | go32_pde (char *arg, int from_tty) | |
1940 | { | |
1941 | long pde_idx = -1, i; | |
1942 | ||
1943 | if (arg && *arg) | |
1944 | { | |
1945 | while (*arg && isspace(*arg)) | |
1946 | arg++; | |
1947 | ||
1948 | if (*arg) | |
1949 | { | |
1950 | pde_idx = parse_and_eval_long (arg); | |
1951 | if (pde_idx < 0 || pde_idx >= 1024) | |
8a3fe4f8 | 1952 | error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx); |
9f20bf26 EZ |
1953 | } |
1954 | } | |
1955 | ||
1956 | pdbr = get_cr3 (); | |
1957 | if (!pdbr) | |
1958 | puts_filtered ("Access to Page Directories is not supported on this system.\n"); | |
1959 | else if (pde_idx >= 0) | |
1960 | display_ptable_entry (get_pde (pde_idx), 1, 1, 0); | |
1961 | else | |
1962 | for (i = 0; i < 1024; i++) | |
1963 | display_ptable_entry (get_pde (i), 1, 0, 0); | |
1964 | } | |
1965 | ||
1966 | /* A helper function to display entries in a Page Table pointed to by | |
1967 | the N'th entry in the Page Directory. If FORCE is non-zero, say | |
1968 | something even if the Page Table is not accessible. */ | |
1969 | static void | |
1970 | display_page_table (long n, int force) | |
1971 | { | |
1972 | unsigned long pde = get_pde (n); | |
1973 | ||
1974 | if ((pde & 1) != 0) | |
1975 | { | |
1976 | int i; | |
1977 | ||
1978 | printf_filtered ("Page Table pointed to by Page Directory entry 0x%lx:\n", n); | |
1979 | for (i = 0; i < 1024; i++) | |
1980 | display_ptable_entry (get_pte (pde, i), 0, 0, 0); | |
1981 | puts_filtered ("\n"); | |
1982 | } | |
1983 | else if (force) | |
1984 | printf_filtered ("Page Table not present; value=0x%lx.\n", pde >> 1); | |
1985 | } | |
1986 | ||
1987 | static void | |
1988 | go32_pte (char *arg, int from_tty) | |
1989 | { | |
ccbc3e6f | 1990 | long pde_idx = -1L, i; |
9f20bf26 EZ |
1991 | |
1992 | if (arg && *arg) | |
1993 | { | |
1994 | while (*arg && isspace(*arg)) | |
1995 | arg++; | |
1996 | ||
1997 | if (*arg) | |
1998 | { | |
1999 | pde_idx = parse_and_eval_long (arg); | |
2000 | if (pde_idx < 0 || pde_idx >= 1024) | |
8a3fe4f8 | 2001 | error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx); |
9f20bf26 EZ |
2002 | } |
2003 | } | |
2004 | ||
2005 | pdbr = get_cr3 (); | |
2006 | if (!pdbr) | |
2007 | puts_filtered ("Access to Page Tables is not supported on this system.\n"); | |
2008 | else if (pde_idx >= 0) | |
2009 | display_page_table (pde_idx, 1); | |
2010 | else | |
2011 | for (i = 0; i < 1024; i++) | |
2012 | display_page_table (i, 0); | |
2013 | } | |
2014 | ||
2015 | static void | |
2016 | go32_pte_for_address (char *arg, int from_tty) | |
2017 | { | |
2018 | CORE_ADDR addr = 0, i; | |
2019 | ||
2020 | if (arg && *arg) | |
2021 | { | |
2022 | while (*arg && isspace(*arg)) | |
2023 | arg++; | |
2024 | ||
2025 | if (*arg) | |
2026 | addr = parse_and_eval_address (arg); | |
2027 | } | |
2028 | if (!addr) | |
e2e0b3e5 | 2029 | error_no_arg (_("linear address")); |
9f20bf26 EZ |
2030 | |
2031 | pdbr = get_cr3 (); | |
2032 | if (!pdbr) | |
2033 | puts_filtered ("Access to Page Tables is not supported on this system.\n"); | |
2034 | else | |
2035 | { | |
2036 | int pde_idx = (addr >> 22) & 0x3ff; | |
2037 | int pte_idx = (addr >> 12) & 0x3ff; | |
2038 | unsigned offs = addr & 0xfff; | |
2039 | ||
2040 | printf_filtered ("Page Table entry for address 0x%llx:\n", | |
2041 | (unsigned long long)addr); | |
2042 | display_ptable_entry (get_pte (get_pde (pde_idx), pte_idx), 0, 1, offs); | |
2043 | } | |
2044 | } | |
2045 | ||
d8c852a1 EZ |
2046 | static struct cmd_list_element *info_dos_cmdlist = NULL; |
2047 | ||
2048 | static void | |
2049 | go32_info_dos_command (char *args, int from_tty) | |
2050 | { | |
2051 | help_list (info_dos_cmdlist, "info dos ", class_info, gdb_stdout); | |
2052 | } | |
2053 | ||
e49d4fa6 SS |
2054 | void |
2055 | _initialize_go32_nat (void) | |
2056 | { | |
2057 | init_go32_ops (); | |
2058 | add_target (&go32_ops); | |
10ba702d | 2059 | |
1bedd215 AC |
2060 | add_prefix_cmd ("dos", class_info, go32_info_dos_command, _("\ |
2061 | Print information specific to DJGPP (aka MS-DOS) debugging."), | |
d8c852a1 EZ |
2062 | &info_dos_cmdlist, "info dos ", 0, &infolist); |
2063 | ||
1a966eab AC |
2064 | add_cmd ("sysinfo", class_info, go32_sysinfo, _("\ |
2065 | Display information about the target system, including CPU, OS, DPMI, etc."), | |
d8c852a1 | 2066 | &info_dos_cmdlist); |
1a966eab AC |
2067 | add_cmd ("ldt", class_info, go32_sldt, _("\ |
2068 | Display entries in the LDT (Local Descriptor Table).\n\ | |
2069 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2070 | &info_dos_cmdlist); |
1a966eab AC |
2071 | add_cmd ("gdt", class_info, go32_sgdt, _("\ |
2072 | Display entries in the GDT (Global Descriptor Table).\n\ | |
2073 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2074 | &info_dos_cmdlist); |
1a966eab AC |
2075 | add_cmd ("idt", class_info, go32_sidt, _("\ |
2076 | Display entries in the IDT (Interrupt Descriptor Table).\n\ | |
2077 | Entry number (an expression) as an argument means display only that entry."), | |
d8c852a1 | 2078 | &info_dos_cmdlist); |
1a966eab AC |
2079 | add_cmd ("pde", class_info, go32_pde, _("\ |
2080 | Display entries in the Page Directory.\n\ | |
2081 | Entry number (an expression) as an argument means display only that entry."), | |
9f20bf26 | 2082 | &info_dos_cmdlist); |
1a966eab AC |
2083 | add_cmd ("pte", class_info, go32_pte, _("\ |
2084 | Display entries in Page Tables.\n\ | |
2085 | Entry number (an expression) as an argument means display only entries\n\ | |
2086 | from the Page Table pointed to by the specified Page Directory entry."), | |
9f20bf26 | 2087 | &info_dos_cmdlist); |
1a966eab AC |
2088 | add_cmd ("address-pte", class_info, go32_pte_for_address, _("\ |
2089 | Display a Page Table entry for a linear address.\n\ | |
2090 | The address argument must be a linear address, after adding to\n\ | |
2091 | it the base address of the appropriate segment.\n\ | |
2092 | The base address of variables and functions in the debuggee's data\n\ | |
2093 | or code segment is stored in the variable __djgpp_base_address,\n\ | |
2094 | so use `__djgpp_base_address + (char *)&var' as the argument.\n\ | |
2095 | For other segments, look up their base address in the output of\n\ | |
2096 | the `info dos ldt' command."), | |
9f20bf26 | 2097 | &info_dos_cmdlist); |
e49d4fa6 | 2098 | } |
53a5351d JM |
2099 | |
2100 | pid_t | |
2101 | tcgetpgrp (int fd) | |
2102 | { | |
2103 | if (isatty (fd)) | |
2104 | return SOME_PID; | |
2105 | errno = ENOTTY; | |
2106 | return -1; | |
2107 | } | |
2108 | ||
2109 | int | |
2110 | tcsetpgrp (int fd, pid_t pgid) | |
2111 | { | |
2112 | if (isatty (fd) && pgid == SOME_PID) | |
2113 | return 0; | |
2114 | errno = pgid == SOME_PID ? ENOTTY : ENOSYS; | |
2115 | return -1; | |
2116 | } |