Commit | Line | Data |
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e49d4fa6 | 1 | /* Native debugging support for Intel x86 running DJGPP. |
e24d4c64 | 2 | Copyright 1997, 1999, 2000, 2001 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 | |
9 | the Free Software Foundation; either version 2 of the License, or | |
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 JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
e49d4fa6 SS |
21 | |
22 | #include <fcntl.h> | |
23 | ||
24 | #include "defs.h" | |
e49d4fa6 | 25 | #include "inferior.h" |
03f2053f | 26 | #include "gdb_wait.h" |
e49d4fa6 SS |
27 | #include "gdbcore.h" |
28 | #include "command.h" | |
29 | #include "floatformat.h" | |
0fff5247 | 30 | #include "buildsym.h" |
89dea5aa | 31 | #include "i387-nat.h" |
4e052eda | 32 | #include "regcache.h" |
e49d4fa6 | 33 | |
c5aa993b | 34 | #include <stdio.h> /* required for __DJGPP_MINOR__ */ |
e49d4fa6 SS |
35 | #include <stdlib.h> |
36 | #include <string.h> | |
53a5351d | 37 | #include <errno.h> |
c2c6d25f | 38 | #include <unistd.h> |
53a5351d JM |
39 | #include <io.h> |
40 | #include <dpmi.h> | |
e49d4fa6 SS |
41 | #include <debug/v2load.h> |
42 | #include <debug/dbgcom.h> | |
53a5351d JM |
43 | #if __DJGPP_MINOR__ > 2 |
44 | #include <debug/redir.h> | |
45 | #endif | |
e49d4fa6 | 46 | |
b83266a0 SS |
47 | #if __DJGPP_MINOR__ < 3 |
48 | /* This code will be provided from DJGPP 2.03 on. Until then I code it | |
49 | here */ | |
c5aa993b JM |
50 | typedef struct |
51 | { | |
52 | unsigned short sig0; | |
53 | unsigned short sig1; | |
54 | unsigned short sig2; | |
55 | unsigned short sig3; | |
56 | unsigned short exponent:15; | |
57 | unsigned short sign:1; | |
58 | } | |
59 | NPXREG; | |
60 | ||
61 | typedef struct | |
62 | { | |
63 | unsigned int control; | |
64 | unsigned int status; | |
65 | unsigned int tag; | |
66 | unsigned int eip; | |
67 | unsigned int cs; | |
68 | unsigned int dataptr; | |
69 | unsigned int datasel; | |
70 | NPXREG reg[8]; | |
71 | } | |
72 | NPX; | |
b83266a0 SS |
73 | |
74 | static NPX npx; | |
75 | ||
c5aa993b JM |
76 | static void save_npx (void); /* Save the FPU of the debugged program */ |
77 | static void load_npx (void); /* Restore the FPU of the debugged program */ | |
b83266a0 SS |
78 | |
79 | /* ------------------------------------------------------------------------- */ | |
80 | /* Store the contents of the NPX in the global variable `npx'. */ | |
c5aa993b | 81 | /* *INDENT-OFF* */ |
b83266a0 SS |
82 | |
83 | static void | |
84 | save_npx (void) | |
85 | { | |
86 | asm ("inb $0xa0, %%al | |
c5aa993b JM |
87 | testb $0x20, %%al |
88 | jz 1f | |
89 | xorb %% al, %%al | |
90 | outb %% al, $0xf0 | |
91 | movb $0x20, %%al | |
92 | outb %% al, $0xa0 | |
93 | outb %% al, $0x20 | |
b83266a0 | 94 | 1: |
c5aa993b JM |
95 | fnsave % 0 |
96 | fwait " | |
97 | : "=m" (npx) | |
98 | : /* No input */ | |
99 | : "%eax"); | |
b83266a0 | 100 | } |
c5aa993b JM |
101 | |
102 | /* *INDENT-ON* */ | |
103 | ||
104 | ||
105 | ||
106 | ||
107 | ||
b83266a0 SS |
108 | /* ------------------------------------------------------------------------- */ |
109 | /* Reload the contents of the NPX from the global variable `npx'. */ | |
110 | ||
111 | static void | |
112 | load_npx (void) | |
113 | { | |
c5aa993b | 114 | asm ("frstor %0":"=m" (npx)); |
b83266a0 | 115 | } |
53a5351d JM |
116 | /* ------------------------------------------------------------------------- */ |
117 | /* Stubs for the missing redirection functions. */ | |
118 | typedef struct { | |
119 | char *command; | |
120 | int redirected; | |
121 | } cmdline_t; | |
122 | ||
123 | void redir_cmdline_delete (cmdline_t *ptr) {ptr->redirected = 0;} | |
124 | int redir_cmdline_parse (const char *args, cmdline_t *ptr) | |
125 | { | |
126 | return -1; | |
127 | } | |
128 | int redir_to_child (cmdline_t *ptr) | |
129 | { | |
130 | return 1; | |
131 | } | |
132 | int redir_to_debugger (cmdline_t *ptr) | |
133 | { | |
134 | return 1; | |
135 | } | |
136 | int redir_debug_init (cmdline_t *ptr) { return 0; } | |
b83266a0 SS |
137 | #endif /* __DJGPP_MINOR < 3 */ |
138 | ||
e49d4fa6 SS |
139 | extern void _initialize_go32_nat (void); |
140 | ||
53a5351d JM |
141 | typedef enum { wp_insert, wp_remove, wp_count } wp_op; |
142 | ||
143 | /* This holds the current reference counts for each debug register. */ | |
144 | static int dr_ref_count[4]; | |
145 | ||
e49d4fa6 SS |
146 | extern char **environ; |
147 | ||
148 | #define SOME_PID 42 | |
149 | ||
e49d4fa6 | 150 | static int prog_has_started = 0; |
c5aa993b JM |
151 | static void go32_open (char *name, int from_tty); |
152 | static void go32_close (int quitting); | |
153 | static void go32_attach (char *args, int from_tty); | |
154 | static void go32_detach (char *args, int from_tty); | |
155 | static void go32_resume (int pid, int step, enum target_signal siggnal); | |
156 | static int go32_wait (int pid, struct target_waitstatus *status); | |
157 | static void go32_fetch_registers (int regno); | |
158 | static void store_register (int regno); | |
159 | static void go32_store_registers (int regno); | |
160 | static void go32_prepare_to_store (void); | |
161 | static int go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, | |
a17b5c4e EZ |
162 | int write, |
163 | struct mem_attrib *attrib, | |
164 | struct target_ops *target); | |
c5aa993b JM |
165 | static void go32_files_info (struct target_ops *target); |
166 | static void go32_stop (void); | |
167 | static void go32_kill_inferior (void); | |
168 | static void go32_create_inferior (char *exec_file, char *args, char **env); | |
169 | static void go32_mourn_inferior (void); | |
170 | static int go32_can_run (void); | |
b83266a0 SS |
171 | |
172 | static struct target_ops go32_ops; | |
c5aa993b JM |
173 | static void go32_terminal_init (void); |
174 | static void go32_terminal_inferior (void); | |
175 | static void go32_terminal_ours (void); | |
e49d4fa6 | 176 | |
53a5351d | 177 | #define r_ofs(x) (offsetof(TSS,x)) |
e49d4fa6 SS |
178 | |
179 | static struct | |
180 | { | |
53a5351d JM |
181 | size_t tss_ofs; |
182 | size_t size; | |
e49d4fa6 SS |
183 | } |
184 | regno_mapping[] = | |
185 | { | |
0fff5247 EZ |
186 | {r_ofs (tss_eax), 4}, /* normal registers, from a_tss */ |
187 | {r_ofs (tss_ecx), 4}, | |
188 | {r_ofs (tss_edx), 4}, | |
189 | {r_ofs (tss_ebx), 4}, | |
190 | {r_ofs (tss_esp), 4}, | |
191 | {r_ofs (tss_ebp), 4}, | |
192 | {r_ofs (tss_esi), 4}, | |
193 | {r_ofs (tss_edi), 4}, | |
194 | {r_ofs (tss_eip), 4}, | |
195 | {r_ofs (tss_eflags), 4}, | |
196 | {r_ofs (tss_cs), 2}, | |
197 | {r_ofs (tss_ss), 2}, | |
198 | {r_ofs (tss_ds), 2}, | |
199 | {r_ofs (tss_es), 2}, | |
200 | {r_ofs (tss_fs), 2}, | |
201 | {r_ofs (tss_gs), 2}, | |
202 | {0, 10}, /* 8 FP registers, from npx.reg[] */ | |
203 | {1, 10}, | |
204 | {2, 10}, | |
205 | {3, 10}, | |
206 | {4, 10}, | |
207 | {5, 10}, | |
208 | {6, 10}, | |
209 | {7, 10}, | |
53a5351d | 210 | /* The order of the next 7 registers must be consistent |
0fff5247 EZ |
211 | with their numbering in config/i386/tm-i386.h, which see. */ |
212 | {0, 2}, /* control word, from npx */ | |
213 | {4, 2}, /* status word, from npx */ | |
214 | {8, 2}, /* tag word, from npx */ | |
215 | {16, 2}, /* last FP exception CS from npx */ | |
216 | {12, 4}, /* last FP exception EIP from npx */ | |
217 | {24, 2}, /* last FP exception operand selector from npx */ | |
218 | {20, 4}, /* last FP exception operand offset from npx */ | |
219 | {18, 2} /* last FP opcode from npx */ | |
e49d4fa6 SS |
220 | }; |
221 | ||
222 | static struct | |
223 | { | |
224 | int go32_sig; | |
0fff5247 | 225 | enum target_signal gdb_sig; |
e49d4fa6 SS |
226 | } |
227 | sig_map[] = | |
228 | { | |
0fff5247 EZ |
229 | {0, TARGET_SIGNAL_FPE}, |
230 | {1, TARGET_SIGNAL_TRAP}, | |
53a5351d JM |
231 | /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL, |
232 | but I think SIGBUS is better, since the NMI is usually activated | |
233 | as a result of a memory parity check failure. */ | |
0fff5247 EZ |
234 | {2, TARGET_SIGNAL_BUS}, |
235 | {3, TARGET_SIGNAL_TRAP}, | |
236 | {4, TARGET_SIGNAL_FPE}, | |
237 | {5, TARGET_SIGNAL_SEGV}, | |
238 | {6, TARGET_SIGNAL_ILL}, | |
239 | {7, TARGET_SIGNAL_EMT}, /* no-coprocessor exception */ | |
240 | {8, TARGET_SIGNAL_SEGV}, | |
241 | {9, TARGET_SIGNAL_SEGV}, | |
242 | {10, TARGET_SIGNAL_BUS}, | |
243 | {11, TARGET_SIGNAL_SEGV}, | |
244 | {12, TARGET_SIGNAL_SEGV}, | |
245 | {13, TARGET_SIGNAL_SEGV}, | |
246 | {14, TARGET_SIGNAL_SEGV}, | |
247 | {16, TARGET_SIGNAL_FPE}, | |
248 | {17, TARGET_SIGNAL_BUS}, | |
249 | {31, TARGET_SIGNAL_ILL}, | |
250 | {0x1b, TARGET_SIGNAL_INT}, | |
251 | {0x75, TARGET_SIGNAL_FPE}, | |
252 | {0x78, TARGET_SIGNAL_ALRM}, | |
253 | {0x79, TARGET_SIGNAL_INT}, | |
254 | {0x7a, TARGET_SIGNAL_QUIT}, | |
255 | {-1, TARGET_SIGNAL_LAST} | |
e49d4fa6 SS |
256 | }; |
257 | ||
53a5351d JM |
258 | static struct { |
259 | enum target_signal gdb_sig; | |
260 | int djgpp_excepno; | |
261 | } excepn_map[] = { | |
0fff5247 EZ |
262 | {TARGET_SIGNAL_0, -1}, |
263 | {TARGET_SIGNAL_ILL, 6}, /* Invalid Opcode */ | |
264 | {TARGET_SIGNAL_EMT, 7}, /* triggers SIGNOFP */ | |
265 | {TARGET_SIGNAL_SEGV, 13}, /* GPF */ | |
266 | {TARGET_SIGNAL_BUS, 17}, /* Alignment Check */ | |
53a5351d JM |
267 | /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for |
268 | details. */ | |
0fff5247 EZ |
269 | {TARGET_SIGNAL_TERM, 0x1b}, /* triggers Ctrl-Break type of SIGINT */ |
270 | {TARGET_SIGNAL_FPE, 0x75}, | |
271 | {TARGET_SIGNAL_INT, 0x79}, | |
272 | {TARGET_SIGNAL_QUIT, 0x7a}, | |
273 | {TARGET_SIGNAL_ALRM, 0x78}, /* triggers SIGTIMR */ | |
274 | {TARGET_SIGNAL_PROF, 0x78}, | |
275 | {TARGET_SIGNAL_LAST, -1} | |
53a5351d JM |
276 | }; |
277 | ||
e49d4fa6 | 278 | static void |
0fff5247 | 279 | go32_open (char *name ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED) |
e49d4fa6 | 280 | { |
53a5351d | 281 | printf_unfiltered ("Done. Use the \"run\" command to run the program.\n"); |
e49d4fa6 SS |
282 | } |
283 | ||
284 | static void | |
0fff5247 | 285 | go32_close (int quitting ATTRIBUTE_UNUSED) |
e49d4fa6 SS |
286 | { |
287 | } | |
288 | ||
289 | static void | |
0fff5247 | 290 | go32_attach (char *args ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED) |
e49d4fa6 | 291 | { |
53a5351d JM |
292 | error ("\ |
293 | You cannot attach to a running program on this platform.\n\ | |
294 | Use the `run' command to run DJGPP programs."); | |
e49d4fa6 SS |
295 | } |
296 | ||
297 | static void | |
0fff5247 | 298 | go32_detach (char *args ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED) |
e49d4fa6 SS |
299 | { |
300 | } | |
301 | ||
302 | static int resume_is_step; | |
53a5351d | 303 | static int resume_signal = -1; |
e49d4fa6 SS |
304 | |
305 | static void | |
0fff5247 | 306 | go32_resume (int pid ATTRIBUTE_UNUSED, int step, enum target_signal siggnal) |
c5aa993b | 307 | { |
53a5351d JM |
308 | int i; |
309 | ||
c5aa993b | 310 | resume_is_step = step; |
53a5351d JM |
311 | |
312 | if (siggnal != TARGET_SIGNAL_0 && siggnal != TARGET_SIGNAL_TRAP) | |
313 | { | |
0fff5247 EZ |
314 | for (i = 0, resume_signal = -1; |
315 | excepn_map[i].gdb_sig != TARGET_SIGNAL_LAST; i++) | |
53a5351d JM |
316 | if (excepn_map[i].gdb_sig == siggnal) |
317 | { | |
318 | resume_signal = excepn_map[i].djgpp_excepno; | |
319 | break; | |
320 | } | |
321 | if (resume_signal == -1) | |
322 | printf_unfiltered ("Cannot deliver signal %s on this platform.\n", | |
323 | target_signal_to_name (siggnal)); | |
324 | } | |
c5aa993b | 325 | } |
e49d4fa6 | 326 | |
53a5351d JM |
327 | static char child_cwd[FILENAME_MAX]; |
328 | ||
e49d4fa6 | 329 | static int |
0fff5247 | 330 | go32_wait (int pid ATTRIBUTE_UNUSED, struct target_waitstatus *status) |
e49d4fa6 SS |
331 | { |
332 | int i; | |
53a5351d | 333 | unsigned char saved_opcode; |
0fff5247 | 334 | unsigned long INT3_addr = 0; |
53a5351d | 335 | int stepping_over_INT = 0; |
e49d4fa6 | 336 | |
53a5351d | 337 | a_tss.tss_eflags &= 0xfeff; /* reset the single-step flag (TF) */ |
e49d4fa6 | 338 | if (resume_is_step) |
53a5351d JM |
339 | { |
340 | /* If the next instruction is INT xx or INTO, we need to handle | |
341 | them specially. Intel manuals say that these instructions | |
342 | reset the single-step flag (a.k.a. TF). However, it seems | |
343 | that, at least in the DPMI environment, and at least when | |
344 | stepping over the DPMI interrupt 31h, the problem is having | |
345 | TF set at all when INT 31h is executed: the debuggee either | |
346 | crashes (and takes the system with it) or is killed by a | |
347 | SIGTRAP. | |
348 | ||
349 | So we need to emulate single-step mode: we put an INT3 opcode | |
350 | right after the INT xx instruction, let the debuggee run | |
351 | until it hits INT3 and stops, then restore the original | |
352 | instruction which we overwrote with the INT3 opcode, and back | |
353 | up the debuggee's EIP to that instruction. */ | |
354 | read_child (a_tss.tss_eip, &saved_opcode, 1); | |
355 | if (saved_opcode == 0xCD || saved_opcode == 0xCE) | |
356 | { | |
357 | unsigned char INT3_opcode = 0xCC; | |
358 | ||
359 | INT3_addr | |
360 | = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1; | |
361 | stepping_over_INT = 1; | |
362 | read_child (INT3_addr, &saved_opcode, 1); | |
363 | write_child (INT3_addr, &INT3_opcode, 1); | |
364 | } | |
365 | else | |
366 | a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */ | |
367 | } | |
368 | ||
369 | /* The special value FFFFh in tss_trap indicates to run_child that | |
370 | tss_irqn holds a signal to be delivered to the debuggee. */ | |
371 | if (resume_signal <= -1) | |
372 | { | |
373 | a_tss.tss_trap = 0; | |
374 | a_tss.tss_irqn = 0xff; | |
375 | } | |
e49d4fa6 | 376 | else |
53a5351d JM |
377 | { |
378 | a_tss.tss_trap = 0xffff; /* run_child looks for this */ | |
379 | a_tss.tss_irqn = resume_signal; | |
380 | } | |
381 | ||
382 | /* The child might change working directory behind our back. The | |
383 | GDB users won't like the side effects of that when they work with | |
384 | relative file names, and GDB might be confused by its current | |
385 | directory not being in sync with the truth. So we always make a | |
386 | point of changing back to where GDB thinks is its cwd, when we | |
387 | return control to the debugger, but restore child's cwd before we | |
388 | run it. */ | |
3a45aed8 EZ |
389 | /* Initialize child_cwd, before the first call to run_child and not |
390 | in the initialization, so the child get also the changed directory | |
391 | set with the gdb-command "cd ..." */ | |
392 | if (!*child_cwd) | |
393 | /* Initialize child's cwd with the current one. */ | |
394 | getcwd (child_cwd, sizeof (child_cwd)); | |
395 | ||
53a5351d | 396 | chdir (child_cwd); |
e49d4fa6 | 397 | |
b83266a0 | 398 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 399 | load_npx (); |
b83266a0 | 400 | #endif |
e49d4fa6 | 401 | run_child (); |
b83266a0 | 402 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 403 | save_npx (); |
b83266a0 | 404 | #endif |
e49d4fa6 | 405 | |
53a5351d JM |
406 | /* Did we step over an INT xx instruction? */ |
407 | if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1) | |
408 | { | |
409 | /* Restore the original opcode. */ | |
410 | a_tss.tss_eip--; /* EIP points *after* the INT3 instruction */ | |
411 | write_child (a_tss.tss_eip, &saved_opcode, 1); | |
412 | /* Simulate a TRAP exception. */ | |
413 | a_tss.tss_irqn = 1; | |
414 | a_tss.tss_eflags |= 0x0100; | |
415 | } | |
416 | ||
417 | getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */ | |
418 | chdir (current_directory); | |
419 | ||
e49d4fa6 SS |
420 | if (a_tss.tss_irqn == 0x21) |
421 | { | |
422 | status->kind = TARGET_WAITKIND_EXITED; | |
423 | status->value.integer = a_tss.tss_eax & 0xff; | |
424 | } | |
425 | else | |
426 | { | |
427 | status->value.sig = TARGET_SIGNAL_UNKNOWN; | |
428 | status->kind = TARGET_WAITKIND_STOPPED; | |
429 | for (i = 0; sig_map[i].go32_sig != -1; i++) | |
430 | { | |
431 | if (a_tss.tss_irqn == sig_map[i].go32_sig) | |
432 | { | |
53a5351d | 433 | #if __DJGPP_MINOR__ < 3 |
e49d4fa6 SS |
434 | if ((status->value.sig = sig_map[i].gdb_sig) != |
435 | TARGET_SIGNAL_TRAP) | |
436 | status->kind = TARGET_WAITKIND_SIGNALLED; | |
53a5351d JM |
437 | #else |
438 | status->value.sig = sig_map[i].gdb_sig; | |
439 | #endif | |
e49d4fa6 SS |
440 | break; |
441 | } | |
442 | } | |
443 | } | |
444 | return SOME_PID; | |
445 | } | |
446 | ||
447 | static void | |
89dea5aa | 448 | fetch_register (int regno) |
e49d4fa6 | 449 | { |
89dea5aa EZ |
450 | if (regno < FP0_REGNUM) |
451 | supply_register (regno, (char *) &a_tss + regno_mapping[regno].tss_ofs); | |
452 | else if (regno <= LAST_FPU_CTRL_REGNUM) | |
453 | i387_supply_register (regno, (char *) &npx); | |
454 | else | |
455 | internal_error (__FILE__, __LINE__, | |
456 | "Invalid register no. %d in fetch_register.", regno); | |
457 | } | |
e49d4fa6 | 458 | |
89dea5aa EZ |
459 | static void |
460 | go32_fetch_registers (int regno) | |
461 | { | |
462 | if (regno >= 0) | |
463 | fetch_register (regno); | |
464 | else | |
e49d4fa6 | 465 | { |
89dea5aa EZ |
466 | for (regno = 0; regno < FP0_REGNUM; regno++) |
467 | fetch_register (regno); | |
468 | i387_supply_fsave ((char *) &npx); | |
e49d4fa6 SS |
469 | } |
470 | } | |
471 | ||
472 | static void | |
473 | store_register (int regno) | |
474 | { | |
475 | void *rp; | |
476 | void *v = (void *) ®isters[REGISTER_BYTE (regno)]; | |
477 | ||
89dea5aa EZ |
478 | if (regno < FP0_REGNUM) |
479 | memcpy ((char *) &a_tss + regno_mapping[regno].tss_ofs, | |
480 | v, regno_mapping[regno].size); | |
481 | else if (regno <= LAST_FPU_CTRL_REGNUM) | |
482 | i387_fill_fsave ((char *)&npx, regno); | |
e49d4fa6 | 483 | else |
8e65ff28 AC |
484 | internal_error (__FILE__, __LINE__, |
485 | "Invalid register no. %d in store_register.", regno); | |
e49d4fa6 SS |
486 | } |
487 | ||
488 | static void | |
489 | go32_store_registers (int regno) | |
490 | { | |
0fff5247 | 491 | unsigned r; |
e49d4fa6 SS |
492 | |
493 | if (regno >= 0) | |
494 | store_register (regno); | |
495 | else | |
496 | { | |
89dea5aa | 497 | for (r = 0; r < FP0_REGNUM; r++) |
e49d4fa6 | 498 | store_register (r); |
89dea5aa | 499 | i387_fill_fsave ((char *) &npx, -1); |
e49d4fa6 SS |
500 | } |
501 | } | |
502 | ||
503 | static void | |
504 | go32_prepare_to_store (void) | |
505 | { | |
506 | } | |
507 | ||
508 | static int | |
509 | go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
a17b5c4e | 510 | struct mem_attrib *attrib ATTRIBUTE_UNUSED, |
0fff5247 | 511 | struct target_ops *target ATTRIBUTE_UNUSED) |
e49d4fa6 SS |
512 | { |
513 | if (write) | |
514 | { | |
515 | if (write_child (memaddr, myaddr, len)) | |
516 | { | |
517 | return 0; | |
518 | } | |
519 | else | |
520 | { | |
521 | return len; | |
522 | } | |
523 | } | |
524 | else | |
525 | { | |
526 | if (read_child (memaddr, myaddr, len)) | |
527 | { | |
528 | return 0; | |
529 | } | |
530 | else | |
531 | { | |
532 | return len; | |
533 | } | |
534 | } | |
535 | } | |
536 | ||
53a5351d JM |
537 | static cmdline_t child_cmd; /* parsed child's command line kept here */ |
538 | ||
e49d4fa6 | 539 | static void |
0fff5247 | 540 | go32_files_info (struct target_ops *target ATTRIBUTE_UNUSED) |
e49d4fa6 | 541 | { |
53a5351d | 542 | printf_unfiltered ("You are running a DJGPP V2 program.\n"); |
e49d4fa6 SS |
543 | } |
544 | ||
545 | static void | |
546 | go32_stop (void) | |
547 | { | |
548 | normal_stop (); | |
549 | cleanup_client (); | |
550 | inferior_pid = 0; | |
551 | prog_has_started = 0; | |
552 | } | |
553 | ||
554 | static void | |
555 | go32_kill_inferior (void) | |
556 | { | |
53a5351d JM |
557 | redir_cmdline_delete (&child_cmd); |
558 | resume_signal = -1; | |
559 | resume_is_step = 0; | |
e49d4fa6 SS |
560 | unpush_target (&go32_ops); |
561 | } | |
562 | ||
563 | static void | |
564 | go32_create_inferior (char *exec_file, char *args, char **env) | |
565 | { | |
566 | jmp_buf start_state; | |
567 | char *cmdline; | |
568 | char **env_save = environ; | |
569 | ||
0fff5247 EZ |
570 | /* If no exec file handed to us, get it from the exec-file command -- with |
571 | a good, common error message if none is specified. */ | |
572 | if (exec_file == 0) | |
573 | exec_file = get_exec_file (1); | |
574 | ||
e49d4fa6 SS |
575 | if (prog_has_started) |
576 | { | |
b83266a0 | 577 | go32_stop (); |
e49d4fa6 SS |
578 | go32_kill_inferior (); |
579 | } | |
53a5351d JM |
580 | resume_signal = -1; |
581 | resume_is_step = 0; | |
3a45aed8 EZ |
582 | |
583 | /* Initialize child's cwd as empty to be initialized when starting | |
584 | the child. */ | |
585 | *child_cwd = 0; | |
586 | ||
53a5351d JM |
587 | /* Init command line storage. */ |
588 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 AC |
589 | internal_error (__FILE__, __LINE__, |
590 | "Cannot allocate redirection storage: not enough memory.\n"); | |
53a5351d JM |
591 | |
592 | /* Parse the command line and create redirections. */ | |
593 | if (strpbrk (args, "<>")) | |
594 | { | |
595 | if (redir_cmdline_parse (args, &child_cmd) == 0) | |
596 | args = child_cmd.command; | |
597 | else | |
598 | error ("Syntax error in command line."); | |
599 | } | |
600 | else | |
c2d11a7d | 601 | child_cmd.command = xstrdup (args); |
e49d4fa6 SS |
602 | |
603 | cmdline = (char *) alloca (strlen (args) + 4); | |
604 | cmdline[0] = strlen (args); | |
605 | strcpy (cmdline + 1, args); | |
606 | cmdline[strlen (args) + 1] = 13; | |
607 | ||
608 | environ = env; | |
609 | ||
610 | if (v2loadimage (exec_file, cmdline, start_state)) | |
611 | { | |
612 | environ = env_save; | |
613 | printf_unfiltered ("Load failed for image %s\n", exec_file); | |
614 | exit (1); | |
615 | } | |
616 | environ = env_save; | |
617 | ||
618 | edi_init (start_state); | |
53a5351d JM |
619 | #if __DJGPP_MINOR__ < 3 |
620 | save_npx (); | |
621 | #endif | |
e49d4fa6 SS |
622 | |
623 | inferior_pid = SOME_PID; | |
624 | push_target (&go32_ops); | |
625 | clear_proceed_status (); | |
626 | insert_breakpoints (); | |
2acceee2 | 627 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); |
b83266a0 | 628 | prog_has_started = 1; |
e49d4fa6 SS |
629 | } |
630 | ||
631 | static void | |
632 | go32_mourn_inferior (void) | |
633 | { | |
53a5351d JM |
634 | /* We need to make sure all the breakpoint enable bits in the DR7 |
635 | register are reset when the inferior exits. Otherwise, if they | |
636 | rerun the inferior, the uncleared bits may cause random SIGTRAPs, | |
637 | failure to set more watchpoints, and other calamities. It would | |
638 | be nice if GDB itself would take care to remove all breakpoints | |
639 | at all times, but it doesn't, probably under an assumption that | |
640 | the OS cleans up when the debuggee exits. */ | |
e24d4c64 | 641 | i386_cleanup_dregs (); |
e49d4fa6 SS |
642 | go32_kill_inferior (); |
643 | generic_mourn_inferior (); | |
644 | } | |
645 | ||
646 | static int | |
647 | go32_can_run (void) | |
648 | { | |
649 | return 1; | |
650 | } | |
651 | ||
e49d4fa6 SS |
652 | /* Hardware watchpoint support. */ |
653 | ||
e49d4fa6 | 654 | #define D_REGS edi.dr |
e24d4c64 EZ |
655 | #define CONTROL D_REGS[7] |
656 | #define STATUS D_REGS[6] | |
53a5351d | 657 | |
e24d4c64 EZ |
658 | /* Pass the address ADDR to the inferior in the I'th debug register. |
659 | Here we just store the address in D_REGS, the watchpoint will be | |
660 | actually set up when go32_wait runs the debuggee. */ | |
661 | void | |
662 | go32_set_dr (int i, CORE_ADDR addr) | |
e49d4fa6 | 663 | { |
e24d4c64 | 664 | D_REGS[i] = addr; |
e49d4fa6 SS |
665 | } |
666 | ||
e24d4c64 EZ |
667 | /* Pass the value VAL to the inferior in the DR7 debug control |
668 | register. Here we just store the address in D_REGS, the watchpoint | |
669 | will be actually set up when go32_wait runs the debuggee. */ | |
670 | void | |
671 | go32_set_dr7 (unsigned val) | |
53a5351d | 672 | { |
e24d4c64 | 673 | CONTROL = val; |
53a5351d JM |
674 | } |
675 | ||
e24d4c64 EZ |
676 | /* Get the value of the DR6 debug status register from the inferior. |
677 | Here we just return the value stored in D_REGS, as we've got it | |
678 | from the last go32_wait call. */ | |
679 | unsigned | |
680 | go32_get_dr6 (void) | |
e49d4fa6 | 681 | { |
e24d4c64 | 682 | return STATUS; |
e49d4fa6 SS |
683 | } |
684 | ||
53a5351d JM |
685 | /* Put the device open on handle FD into either raw or cooked |
686 | mode, return 1 if it was in raw mode, zero otherwise. */ | |
687 | ||
688 | static int | |
689 | device_mode (int fd, int raw_p) | |
690 | { | |
691 | int oldmode, newmode; | |
692 | __dpmi_regs regs; | |
693 | ||
694 | regs.x.ax = 0x4400; | |
695 | regs.x.bx = fd; | |
696 | __dpmi_int (0x21, ®s); | |
697 | if (regs.x.flags & 1) | |
698 | return -1; | |
699 | newmode = oldmode = regs.x.dx; | |
700 | ||
701 | if (raw_p) | |
702 | newmode |= 0x20; | |
703 | else | |
704 | newmode &= ~0x20; | |
705 | ||
706 | if (oldmode & 0x80) /* Only for character dev */ | |
707 | { | |
708 | regs.x.ax = 0x4401; | |
709 | regs.x.bx = fd; | |
710 | regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails */ | |
711 | __dpmi_int (0x21, ®s); | |
712 | if (regs.x.flags & 1) | |
713 | return -1; | |
714 | } | |
715 | return (oldmode & 0x20) == 0x20; | |
716 | } | |
717 | ||
718 | ||
719 | static int inf_mode_valid = 0; | |
720 | static int inf_terminal_mode; | |
721 | ||
722 | /* This semaphore is needed because, amazingly enough, GDB calls | |
723 | target.to_terminal_ours more than once after the inferior stops. | |
724 | But we need the information from the first call only, since the | |
725 | second call will always see GDB's own cooked terminal. */ | |
726 | static int terminal_is_ours = 1; | |
727 | ||
cce74817 JM |
728 | static void |
729 | go32_terminal_init (void) | |
730 | { | |
53a5351d JM |
731 | inf_mode_valid = 0; /* reinitialize, in case they are restarting child */ |
732 | terminal_is_ours = 1; | |
cce74817 JM |
733 | } |
734 | ||
735 | static void | |
0fff5247 | 736 | go32_terminal_info (char *args ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED) |
cce74817 | 737 | { |
53a5351d JM |
738 | printf_unfiltered ("Inferior's terminal is in %s mode.\n", |
739 | !inf_mode_valid | |
740 | ? "default" : inf_terminal_mode ? "raw" : "cooked"); | |
741 | ||
742 | #if __DJGPP_MINOR__ > 2 | |
743 | if (child_cmd.redirection) | |
744 | { | |
745 | int i; | |
746 | ||
747 | for (i = 0; i < DBG_HANDLES; i++) | |
c5aa993b | 748 | { |
53a5351d JM |
749 | if (child_cmd.redirection[i]->file_name) |
750 | printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n", | |
751 | i, child_cmd.redirection[i]->file_name); | |
752 | else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1) | |
753 | printf_unfiltered | |
754 | ("\tFile handle %d appears to be closed by inferior.\n", i); | |
755 | /* Mask off the raw/cooked bit when comparing device info words. */ | |
756 | else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf) | |
757 | != (_get_dev_info (i) & 0xdf)) | |
758 | printf_unfiltered | |
759 | ("\tFile handle %d appears to be redirected by inferior.\n", i); | |
c5aa993b | 760 | } |
53a5351d JM |
761 | } |
762 | #endif | |
763 | } | |
764 | ||
765 | static void | |
766 | go32_terminal_inferior (void) | |
767 | { | |
768 | /* Redirect standard handles as child wants them. */ | |
769 | errno = 0; | |
770 | if (redir_to_child (&child_cmd) == -1) | |
771 | { | |
772 | redir_to_debugger (&child_cmd); | |
773 | error ("Cannot redirect standard handles for program: %s.", | |
774 | strerror (errno)); | |
775 | } | |
776 | /* set the console device of the inferior to whatever mode | |
777 | (raw or cooked) we found it last time */ | |
778 | if (terminal_is_ours) | |
779 | { | |
780 | if (inf_mode_valid) | |
781 | device_mode (0, inf_terminal_mode); | |
782 | terminal_is_ours = 0; | |
783 | } | |
cce74817 JM |
784 | } |
785 | ||
786 | static void | |
787 | go32_terminal_ours (void) | |
788 | { | |
53a5351d JM |
789 | /* Switch to cooked mode on the gdb terminal and save the inferior |
790 | terminal mode to be restored when it is resumed */ | |
791 | if (!terminal_is_ours) | |
792 | { | |
793 | inf_terminal_mode = device_mode (0, 0); | |
794 | if (inf_terminal_mode != -1) | |
795 | inf_mode_valid = 1; | |
796 | else | |
797 | /* If device_mode returned -1, we don't know what happens with | |
798 | handle 0 anymore, so make the info invalid. */ | |
799 | inf_mode_valid = 0; | |
800 | terminal_is_ours = 1; | |
801 | ||
802 | /* Restore debugger's standard handles. */ | |
803 | errno = 0; | |
804 | if (redir_to_debugger (&child_cmd) == -1) | |
805 | { | |
806 | redir_to_child (&child_cmd); | |
807 | error ("Cannot redirect standard handles for debugger: %s.", | |
808 | strerror (errno)); | |
809 | } | |
810 | } | |
cce74817 JM |
811 | } |
812 | ||
e49d4fa6 SS |
813 | static void |
814 | init_go32_ops (void) | |
815 | { | |
816 | go32_ops.to_shortname = "djgpp"; | |
817 | go32_ops.to_longname = "djgpp target process"; | |
818 | go32_ops.to_doc = | |
819 | "Program loaded by djgpp, when gdb is used as an external debugger"; | |
820 | go32_ops.to_open = go32_open; | |
821 | go32_ops.to_close = go32_close; | |
53a5351d | 822 | go32_ops.to_attach = go32_attach; |
e49d4fa6 SS |
823 | go32_ops.to_detach = go32_detach; |
824 | go32_ops.to_resume = go32_resume; | |
825 | go32_ops.to_wait = go32_wait; | |
826 | go32_ops.to_fetch_registers = go32_fetch_registers; | |
827 | go32_ops.to_store_registers = go32_store_registers; | |
828 | go32_ops.to_prepare_to_store = go32_prepare_to_store; | |
829 | go32_ops.to_xfer_memory = go32_xfer_memory; | |
830 | go32_ops.to_files_info = go32_files_info; | |
831 | go32_ops.to_insert_breakpoint = memory_insert_breakpoint; | |
832 | go32_ops.to_remove_breakpoint = memory_remove_breakpoint; | |
cce74817 JM |
833 | go32_ops.to_terminal_init = go32_terminal_init; |
834 | go32_ops.to_terminal_inferior = go32_terminal_inferior; | |
53a5351d | 835 | go32_ops.to_terminal_ours_for_output = go32_terminal_ours; |
cce74817 | 836 | go32_ops.to_terminal_ours = go32_terminal_ours; |
53a5351d | 837 | go32_ops.to_terminal_info = go32_terminal_info; |
e49d4fa6 SS |
838 | go32_ops.to_kill = go32_kill_inferior; |
839 | go32_ops.to_create_inferior = go32_create_inferior; | |
840 | go32_ops.to_mourn_inferior = go32_mourn_inferior; | |
841 | go32_ops.to_can_run = go32_can_run; | |
842 | go32_ops.to_stop = go32_stop; | |
843 | go32_ops.to_stratum = process_stratum; | |
844 | go32_ops.to_has_all_memory = 1; | |
845 | go32_ops.to_has_memory = 1; | |
846 | go32_ops.to_has_stack = 1; | |
847 | go32_ops.to_has_registers = 1; | |
848 | go32_ops.to_has_execution = 1; | |
849 | go32_ops.to_magic = OPS_MAGIC; | |
53a5351d | 850 | |
3a45aed8 EZ |
851 | /* Initialize child's cwd as empty to be initialized when starting |
852 | the child. */ | |
853 | *child_cwd = 0; | |
53a5351d JM |
854 | |
855 | /* Initialize child's command line storage. */ | |
856 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 AC |
857 | internal_error (__FILE__, __LINE__, |
858 | "Cannot allocate redirection storage: not enough memory.\n"); | |
0fff5247 EZ |
859 | |
860 | /* We are always processing GCC-compiled programs. */ | |
861 | processing_gcc_compilation = 2; | |
e49d4fa6 SS |
862 | } |
863 | ||
864 | void | |
865 | _initialize_go32_nat (void) | |
866 | { | |
867 | init_go32_ops (); | |
868 | add_target (&go32_ops); | |
869 | } | |
53a5351d JM |
870 | |
871 | pid_t | |
872 | tcgetpgrp (int fd) | |
873 | { | |
874 | if (isatty (fd)) | |
875 | return SOME_PID; | |
876 | errno = ENOTTY; | |
877 | return -1; | |
878 | } | |
879 | ||
880 | int | |
881 | tcsetpgrp (int fd, pid_t pgid) | |
882 | { | |
883 | if (isatty (fd) && pgid == SOME_PID) | |
884 | return 0; | |
885 | errno = pgid == SOME_PID ? ENOTTY : ENOSYS; | |
886 | return -1; | |
887 | } |