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e49d4fa6 | 1 | /* Native debugging support for Intel x86 running DJGPP. |
8e65ff28 | 2 | Copyright 1997, 1999, 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" |
e49d4fa6 | 32 | |
c5aa993b | 33 | #include <stdio.h> /* required for __DJGPP_MINOR__ */ |
e49d4fa6 SS |
34 | #include <stdlib.h> |
35 | #include <string.h> | |
53a5351d | 36 | #include <errno.h> |
c2c6d25f | 37 | #include <unistd.h> |
53a5351d JM |
38 | #include <io.h> |
39 | #include <dpmi.h> | |
e49d4fa6 SS |
40 | #include <debug/v2load.h> |
41 | #include <debug/dbgcom.h> | |
53a5351d JM |
42 | #if __DJGPP_MINOR__ > 2 |
43 | #include <debug/redir.h> | |
44 | #endif | |
e49d4fa6 | 45 | |
b83266a0 SS |
46 | #if __DJGPP_MINOR__ < 3 |
47 | /* This code will be provided from DJGPP 2.03 on. Until then I code it | |
48 | here */ | |
c5aa993b JM |
49 | typedef struct |
50 | { | |
51 | unsigned short sig0; | |
52 | unsigned short sig1; | |
53 | unsigned short sig2; | |
54 | unsigned short sig3; | |
55 | unsigned short exponent:15; | |
56 | unsigned short sign:1; | |
57 | } | |
58 | NPXREG; | |
59 | ||
60 | typedef struct | |
61 | { | |
62 | unsigned int control; | |
63 | unsigned int status; | |
64 | unsigned int tag; | |
65 | unsigned int eip; | |
66 | unsigned int cs; | |
67 | unsigned int dataptr; | |
68 | unsigned int datasel; | |
69 | NPXREG reg[8]; | |
70 | } | |
71 | NPX; | |
b83266a0 SS |
72 | |
73 | static NPX npx; | |
74 | ||
c5aa993b JM |
75 | static void save_npx (void); /* Save the FPU of the debugged program */ |
76 | static void load_npx (void); /* Restore the FPU of the debugged program */ | |
b83266a0 SS |
77 | |
78 | /* ------------------------------------------------------------------------- */ | |
79 | /* Store the contents of the NPX in the global variable `npx'. */ | |
c5aa993b | 80 | /* *INDENT-OFF* */ |
b83266a0 SS |
81 | |
82 | static void | |
83 | save_npx (void) | |
84 | { | |
85 | asm ("inb $0xa0, %%al | |
c5aa993b JM |
86 | testb $0x20, %%al |
87 | jz 1f | |
88 | xorb %% al, %%al | |
89 | outb %% al, $0xf0 | |
90 | movb $0x20, %%al | |
91 | outb %% al, $0xa0 | |
92 | outb %% al, $0x20 | |
b83266a0 | 93 | 1: |
c5aa993b JM |
94 | fnsave % 0 |
95 | fwait " | |
96 | : "=m" (npx) | |
97 | : /* No input */ | |
98 | : "%eax"); | |
b83266a0 | 99 | } |
c5aa993b JM |
100 | |
101 | /* *INDENT-ON* */ | |
102 | ||
103 | ||
104 | ||
105 | ||
106 | ||
b83266a0 SS |
107 | /* ------------------------------------------------------------------------- */ |
108 | /* Reload the contents of the NPX from the global variable `npx'. */ | |
109 | ||
110 | static void | |
111 | load_npx (void) | |
112 | { | |
c5aa993b | 113 | asm ("frstor %0":"=m" (npx)); |
b83266a0 | 114 | } |
53a5351d JM |
115 | /* ------------------------------------------------------------------------- */ |
116 | /* Stubs for the missing redirection functions. */ | |
117 | typedef struct { | |
118 | char *command; | |
119 | int redirected; | |
120 | } cmdline_t; | |
121 | ||
122 | void redir_cmdline_delete (cmdline_t *ptr) {ptr->redirected = 0;} | |
123 | int redir_cmdline_parse (const char *args, cmdline_t *ptr) | |
124 | { | |
125 | return -1; | |
126 | } | |
127 | int redir_to_child (cmdline_t *ptr) | |
128 | { | |
129 | return 1; | |
130 | } | |
131 | int redir_to_debugger (cmdline_t *ptr) | |
132 | { | |
133 | return 1; | |
134 | } | |
135 | int redir_debug_init (cmdline_t *ptr) { return 0; } | |
b83266a0 SS |
136 | #endif /* __DJGPP_MINOR < 3 */ |
137 | ||
e49d4fa6 SS |
138 | extern void _initialize_go32_nat (void); |
139 | ||
53a5351d JM |
140 | typedef enum { wp_insert, wp_remove, wp_count } wp_op; |
141 | ||
142 | /* This holds the current reference counts for each debug register. */ | |
143 | static int dr_ref_count[4]; | |
144 | ||
e49d4fa6 SS |
145 | extern char **environ; |
146 | ||
147 | #define SOME_PID 42 | |
148 | ||
e49d4fa6 | 149 | static int prog_has_started = 0; |
c5aa993b JM |
150 | static void go32_open (char *name, int from_tty); |
151 | static void go32_close (int quitting); | |
152 | static void go32_attach (char *args, int from_tty); | |
153 | static void go32_detach (char *args, int from_tty); | |
154 | static void go32_resume (int pid, int step, enum target_signal siggnal); | |
155 | static int go32_wait (int pid, struct target_waitstatus *status); | |
156 | static void go32_fetch_registers (int regno); | |
157 | static void store_register (int regno); | |
158 | static void go32_store_registers (int regno); | |
159 | static void go32_prepare_to_store (void); | |
160 | static int go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, | |
a17b5c4e EZ |
161 | int write, |
162 | struct mem_attrib *attrib, | |
163 | struct target_ops *target); | |
c5aa993b JM |
164 | static void go32_files_info (struct target_ops *target); |
165 | static void go32_stop (void); | |
166 | static void go32_kill_inferior (void); | |
167 | static void go32_create_inferior (char *exec_file, char *args, char **env); | |
53a5351d | 168 | static void cleanup_dregs (void); |
c5aa993b JM |
169 | static void go32_mourn_inferior (void); |
170 | static int go32_can_run (void); | |
53a5351d JM |
171 | static int go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
172 | int len, int rw); | |
173 | static int go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, | |
174 | int len, int rw); | |
175 | static int go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr, | |
176 | CORE_ADDR addr, int len, int rw); | |
b83266a0 SS |
177 | |
178 | static struct target_ops go32_ops; | |
c5aa993b JM |
179 | static void go32_terminal_init (void); |
180 | static void go32_terminal_inferior (void); | |
181 | static void go32_terminal_ours (void); | |
e49d4fa6 | 182 | |
53a5351d | 183 | #define r_ofs(x) (offsetof(TSS,x)) |
e49d4fa6 SS |
184 | |
185 | static struct | |
186 | { | |
53a5351d JM |
187 | size_t tss_ofs; |
188 | size_t size; | |
e49d4fa6 SS |
189 | } |
190 | regno_mapping[] = | |
191 | { | |
0fff5247 EZ |
192 | {r_ofs (tss_eax), 4}, /* normal registers, from a_tss */ |
193 | {r_ofs (tss_ecx), 4}, | |
194 | {r_ofs (tss_edx), 4}, | |
195 | {r_ofs (tss_ebx), 4}, | |
196 | {r_ofs (tss_esp), 4}, | |
197 | {r_ofs (tss_ebp), 4}, | |
198 | {r_ofs (tss_esi), 4}, | |
199 | {r_ofs (tss_edi), 4}, | |
200 | {r_ofs (tss_eip), 4}, | |
201 | {r_ofs (tss_eflags), 4}, | |
202 | {r_ofs (tss_cs), 2}, | |
203 | {r_ofs (tss_ss), 2}, | |
204 | {r_ofs (tss_ds), 2}, | |
205 | {r_ofs (tss_es), 2}, | |
206 | {r_ofs (tss_fs), 2}, | |
207 | {r_ofs (tss_gs), 2}, | |
208 | {0, 10}, /* 8 FP registers, from npx.reg[] */ | |
209 | {1, 10}, | |
210 | {2, 10}, | |
211 | {3, 10}, | |
212 | {4, 10}, | |
213 | {5, 10}, | |
214 | {6, 10}, | |
215 | {7, 10}, | |
53a5351d | 216 | /* The order of the next 7 registers must be consistent |
0fff5247 EZ |
217 | with their numbering in config/i386/tm-i386.h, which see. */ |
218 | {0, 2}, /* control word, from npx */ | |
219 | {4, 2}, /* status word, from npx */ | |
220 | {8, 2}, /* tag word, from npx */ | |
221 | {16, 2}, /* last FP exception CS from npx */ | |
222 | {12, 4}, /* last FP exception EIP from npx */ | |
223 | {24, 2}, /* last FP exception operand selector from npx */ | |
224 | {20, 4}, /* last FP exception operand offset from npx */ | |
225 | {18, 2} /* last FP opcode from npx */ | |
e49d4fa6 SS |
226 | }; |
227 | ||
228 | static struct | |
229 | { | |
230 | int go32_sig; | |
0fff5247 | 231 | enum target_signal gdb_sig; |
e49d4fa6 SS |
232 | } |
233 | sig_map[] = | |
234 | { | |
0fff5247 EZ |
235 | {0, TARGET_SIGNAL_FPE}, |
236 | {1, TARGET_SIGNAL_TRAP}, | |
53a5351d JM |
237 | /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL, |
238 | but I think SIGBUS is better, since the NMI is usually activated | |
239 | as a result of a memory parity check failure. */ | |
0fff5247 EZ |
240 | {2, TARGET_SIGNAL_BUS}, |
241 | {3, TARGET_SIGNAL_TRAP}, | |
242 | {4, TARGET_SIGNAL_FPE}, | |
243 | {5, TARGET_SIGNAL_SEGV}, | |
244 | {6, TARGET_SIGNAL_ILL}, | |
245 | {7, TARGET_SIGNAL_EMT}, /* no-coprocessor exception */ | |
246 | {8, TARGET_SIGNAL_SEGV}, | |
247 | {9, TARGET_SIGNAL_SEGV}, | |
248 | {10, TARGET_SIGNAL_BUS}, | |
249 | {11, TARGET_SIGNAL_SEGV}, | |
250 | {12, TARGET_SIGNAL_SEGV}, | |
251 | {13, TARGET_SIGNAL_SEGV}, | |
252 | {14, TARGET_SIGNAL_SEGV}, | |
253 | {16, TARGET_SIGNAL_FPE}, | |
254 | {17, TARGET_SIGNAL_BUS}, | |
255 | {31, TARGET_SIGNAL_ILL}, | |
256 | {0x1b, TARGET_SIGNAL_INT}, | |
257 | {0x75, TARGET_SIGNAL_FPE}, | |
258 | {0x78, TARGET_SIGNAL_ALRM}, | |
259 | {0x79, TARGET_SIGNAL_INT}, | |
260 | {0x7a, TARGET_SIGNAL_QUIT}, | |
261 | {-1, TARGET_SIGNAL_LAST} | |
e49d4fa6 SS |
262 | }; |
263 | ||
53a5351d JM |
264 | static struct { |
265 | enum target_signal gdb_sig; | |
266 | int djgpp_excepno; | |
267 | } excepn_map[] = { | |
0fff5247 EZ |
268 | {TARGET_SIGNAL_0, -1}, |
269 | {TARGET_SIGNAL_ILL, 6}, /* Invalid Opcode */ | |
270 | {TARGET_SIGNAL_EMT, 7}, /* triggers SIGNOFP */ | |
271 | {TARGET_SIGNAL_SEGV, 13}, /* GPF */ | |
272 | {TARGET_SIGNAL_BUS, 17}, /* Alignment Check */ | |
53a5351d JM |
273 | /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for |
274 | details. */ | |
0fff5247 EZ |
275 | {TARGET_SIGNAL_TERM, 0x1b}, /* triggers Ctrl-Break type of SIGINT */ |
276 | {TARGET_SIGNAL_FPE, 0x75}, | |
277 | {TARGET_SIGNAL_INT, 0x79}, | |
278 | {TARGET_SIGNAL_QUIT, 0x7a}, | |
279 | {TARGET_SIGNAL_ALRM, 0x78}, /* triggers SIGTIMR */ | |
280 | {TARGET_SIGNAL_PROF, 0x78}, | |
281 | {TARGET_SIGNAL_LAST, -1} | |
53a5351d JM |
282 | }; |
283 | ||
e49d4fa6 | 284 | static void |
0fff5247 | 285 | go32_open (char *name ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED) |
e49d4fa6 | 286 | { |
53a5351d | 287 | printf_unfiltered ("Done. Use the \"run\" command to run the program.\n"); |
e49d4fa6 SS |
288 | } |
289 | ||
290 | static void | |
0fff5247 | 291 | go32_close (int quitting ATTRIBUTE_UNUSED) |
e49d4fa6 SS |
292 | { |
293 | } | |
294 | ||
295 | static void | |
0fff5247 | 296 | go32_attach (char *args ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED) |
e49d4fa6 | 297 | { |
53a5351d JM |
298 | error ("\ |
299 | You cannot attach to a running program on this platform.\n\ | |
300 | Use the `run' command to run DJGPP programs."); | |
e49d4fa6 SS |
301 | } |
302 | ||
303 | static void | |
0fff5247 | 304 | go32_detach (char *args ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED) |
e49d4fa6 SS |
305 | { |
306 | } | |
307 | ||
308 | static int resume_is_step; | |
53a5351d | 309 | static int resume_signal = -1; |
e49d4fa6 SS |
310 | |
311 | static void | |
0fff5247 | 312 | go32_resume (int pid ATTRIBUTE_UNUSED, int step, enum target_signal siggnal) |
c5aa993b | 313 | { |
53a5351d JM |
314 | int i; |
315 | ||
c5aa993b | 316 | resume_is_step = step; |
53a5351d JM |
317 | |
318 | if (siggnal != TARGET_SIGNAL_0 && siggnal != TARGET_SIGNAL_TRAP) | |
319 | { | |
0fff5247 EZ |
320 | for (i = 0, resume_signal = -1; |
321 | excepn_map[i].gdb_sig != TARGET_SIGNAL_LAST; i++) | |
53a5351d JM |
322 | if (excepn_map[i].gdb_sig == siggnal) |
323 | { | |
324 | resume_signal = excepn_map[i].djgpp_excepno; | |
325 | break; | |
326 | } | |
327 | if (resume_signal == -1) | |
328 | printf_unfiltered ("Cannot deliver signal %s on this platform.\n", | |
329 | target_signal_to_name (siggnal)); | |
330 | } | |
c5aa993b | 331 | } |
e49d4fa6 | 332 | |
53a5351d JM |
333 | static char child_cwd[FILENAME_MAX]; |
334 | ||
e49d4fa6 | 335 | static int |
0fff5247 | 336 | go32_wait (int pid ATTRIBUTE_UNUSED, struct target_waitstatus *status) |
e49d4fa6 SS |
337 | { |
338 | int i; | |
53a5351d | 339 | unsigned char saved_opcode; |
0fff5247 | 340 | unsigned long INT3_addr = 0; |
53a5351d | 341 | int stepping_over_INT = 0; |
e49d4fa6 | 342 | |
53a5351d | 343 | a_tss.tss_eflags &= 0xfeff; /* reset the single-step flag (TF) */ |
e49d4fa6 | 344 | if (resume_is_step) |
53a5351d JM |
345 | { |
346 | /* If the next instruction is INT xx or INTO, we need to handle | |
347 | them specially. Intel manuals say that these instructions | |
348 | reset the single-step flag (a.k.a. TF). However, it seems | |
349 | that, at least in the DPMI environment, and at least when | |
350 | stepping over the DPMI interrupt 31h, the problem is having | |
351 | TF set at all when INT 31h is executed: the debuggee either | |
352 | crashes (and takes the system with it) or is killed by a | |
353 | SIGTRAP. | |
354 | ||
355 | So we need to emulate single-step mode: we put an INT3 opcode | |
356 | right after the INT xx instruction, let the debuggee run | |
357 | until it hits INT3 and stops, then restore the original | |
358 | instruction which we overwrote with the INT3 opcode, and back | |
359 | up the debuggee's EIP to that instruction. */ | |
360 | read_child (a_tss.tss_eip, &saved_opcode, 1); | |
361 | if (saved_opcode == 0xCD || saved_opcode == 0xCE) | |
362 | { | |
363 | unsigned char INT3_opcode = 0xCC; | |
364 | ||
365 | INT3_addr | |
366 | = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1; | |
367 | stepping_over_INT = 1; | |
368 | read_child (INT3_addr, &saved_opcode, 1); | |
369 | write_child (INT3_addr, &INT3_opcode, 1); | |
370 | } | |
371 | else | |
372 | a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */ | |
373 | } | |
374 | ||
375 | /* The special value FFFFh in tss_trap indicates to run_child that | |
376 | tss_irqn holds a signal to be delivered to the debuggee. */ | |
377 | if (resume_signal <= -1) | |
378 | { | |
379 | a_tss.tss_trap = 0; | |
380 | a_tss.tss_irqn = 0xff; | |
381 | } | |
e49d4fa6 | 382 | else |
53a5351d JM |
383 | { |
384 | a_tss.tss_trap = 0xffff; /* run_child looks for this */ | |
385 | a_tss.tss_irqn = resume_signal; | |
386 | } | |
387 | ||
388 | /* The child might change working directory behind our back. The | |
389 | GDB users won't like the side effects of that when they work with | |
390 | relative file names, and GDB might be confused by its current | |
391 | directory not being in sync with the truth. So we always make a | |
392 | point of changing back to where GDB thinks is its cwd, when we | |
393 | return control to the debugger, but restore child's cwd before we | |
394 | run it. */ | |
3a45aed8 EZ |
395 | /* Initialize child_cwd, before the first call to run_child and not |
396 | in the initialization, so the child get also the changed directory | |
397 | set with the gdb-command "cd ..." */ | |
398 | if (!*child_cwd) | |
399 | /* Initialize child's cwd with the current one. */ | |
400 | getcwd (child_cwd, sizeof (child_cwd)); | |
401 | ||
53a5351d | 402 | chdir (child_cwd); |
e49d4fa6 | 403 | |
b83266a0 | 404 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 405 | load_npx (); |
b83266a0 | 406 | #endif |
e49d4fa6 | 407 | run_child (); |
b83266a0 | 408 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 409 | save_npx (); |
b83266a0 | 410 | #endif |
e49d4fa6 | 411 | |
53a5351d JM |
412 | /* Did we step over an INT xx instruction? */ |
413 | if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1) | |
414 | { | |
415 | /* Restore the original opcode. */ | |
416 | a_tss.tss_eip--; /* EIP points *after* the INT3 instruction */ | |
417 | write_child (a_tss.tss_eip, &saved_opcode, 1); | |
418 | /* Simulate a TRAP exception. */ | |
419 | a_tss.tss_irqn = 1; | |
420 | a_tss.tss_eflags |= 0x0100; | |
421 | } | |
422 | ||
423 | getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */ | |
424 | chdir (current_directory); | |
425 | ||
e49d4fa6 SS |
426 | if (a_tss.tss_irqn == 0x21) |
427 | { | |
428 | status->kind = TARGET_WAITKIND_EXITED; | |
429 | status->value.integer = a_tss.tss_eax & 0xff; | |
430 | } | |
431 | else | |
432 | { | |
433 | status->value.sig = TARGET_SIGNAL_UNKNOWN; | |
434 | status->kind = TARGET_WAITKIND_STOPPED; | |
435 | for (i = 0; sig_map[i].go32_sig != -1; i++) | |
436 | { | |
437 | if (a_tss.tss_irqn == sig_map[i].go32_sig) | |
438 | { | |
53a5351d | 439 | #if __DJGPP_MINOR__ < 3 |
e49d4fa6 SS |
440 | if ((status->value.sig = sig_map[i].gdb_sig) != |
441 | TARGET_SIGNAL_TRAP) | |
442 | status->kind = TARGET_WAITKIND_SIGNALLED; | |
53a5351d JM |
443 | #else |
444 | status->value.sig = sig_map[i].gdb_sig; | |
445 | #endif | |
e49d4fa6 SS |
446 | break; |
447 | } | |
448 | } | |
449 | } | |
450 | return SOME_PID; | |
451 | } | |
452 | ||
453 | static void | |
89dea5aa | 454 | fetch_register (int regno) |
e49d4fa6 | 455 | { |
89dea5aa EZ |
456 | if (regno < FP0_REGNUM) |
457 | supply_register (regno, (char *) &a_tss + regno_mapping[regno].tss_ofs); | |
458 | else if (regno <= LAST_FPU_CTRL_REGNUM) | |
459 | i387_supply_register (regno, (char *) &npx); | |
460 | else | |
461 | internal_error (__FILE__, __LINE__, | |
462 | "Invalid register no. %d in fetch_register.", regno); | |
463 | } | |
e49d4fa6 | 464 | |
89dea5aa EZ |
465 | static void |
466 | go32_fetch_registers (int regno) | |
467 | { | |
468 | if (regno >= 0) | |
469 | fetch_register (regno); | |
470 | else | |
e49d4fa6 | 471 | { |
89dea5aa EZ |
472 | for (regno = 0; regno < FP0_REGNUM; regno++) |
473 | fetch_register (regno); | |
474 | i387_supply_fsave ((char *) &npx); | |
e49d4fa6 SS |
475 | } |
476 | } | |
477 | ||
478 | static void | |
479 | store_register (int regno) | |
480 | { | |
481 | void *rp; | |
482 | void *v = (void *) ®isters[REGISTER_BYTE (regno)]; | |
483 | ||
89dea5aa EZ |
484 | if (regno < FP0_REGNUM) |
485 | memcpy ((char *) &a_tss + regno_mapping[regno].tss_ofs, | |
486 | v, regno_mapping[regno].size); | |
487 | else if (regno <= LAST_FPU_CTRL_REGNUM) | |
488 | i387_fill_fsave ((char *)&npx, regno); | |
e49d4fa6 | 489 | else |
8e65ff28 AC |
490 | internal_error (__FILE__, __LINE__, |
491 | "Invalid register no. %d in store_register.", regno); | |
e49d4fa6 SS |
492 | } |
493 | ||
494 | static void | |
495 | go32_store_registers (int regno) | |
496 | { | |
0fff5247 | 497 | unsigned r; |
e49d4fa6 SS |
498 | |
499 | if (regno >= 0) | |
500 | store_register (regno); | |
501 | else | |
502 | { | |
89dea5aa | 503 | for (r = 0; r < FP0_REGNUM; r++) |
e49d4fa6 | 504 | store_register (r); |
89dea5aa | 505 | i387_fill_fsave ((char *) &npx, -1); |
e49d4fa6 SS |
506 | } |
507 | } | |
508 | ||
509 | static void | |
510 | go32_prepare_to_store (void) | |
511 | { | |
512 | } | |
513 | ||
514 | static int | |
515 | go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
a17b5c4e | 516 | struct mem_attrib *attrib ATTRIBUTE_UNUSED, |
0fff5247 | 517 | struct target_ops *target ATTRIBUTE_UNUSED) |
e49d4fa6 SS |
518 | { |
519 | if (write) | |
520 | { | |
521 | if (write_child (memaddr, myaddr, len)) | |
522 | { | |
523 | return 0; | |
524 | } | |
525 | else | |
526 | { | |
527 | return len; | |
528 | } | |
529 | } | |
530 | else | |
531 | { | |
532 | if (read_child (memaddr, myaddr, len)) | |
533 | { | |
534 | return 0; | |
535 | } | |
536 | else | |
537 | { | |
538 | return len; | |
539 | } | |
540 | } | |
541 | } | |
542 | ||
53a5351d JM |
543 | static cmdline_t child_cmd; /* parsed child's command line kept here */ |
544 | ||
e49d4fa6 | 545 | static void |
0fff5247 | 546 | go32_files_info (struct target_ops *target ATTRIBUTE_UNUSED) |
e49d4fa6 | 547 | { |
53a5351d | 548 | printf_unfiltered ("You are running a DJGPP V2 program.\n"); |
e49d4fa6 SS |
549 | } |
550 | ||
551 | static void | |
552 | go32_stop (void) | |
553 | { | |
554 | normal_stop (); | |
555 | cleanup_client (); | |
556 | inferior_pid = 0; | |
557 | prog_has_started = 0; | |
558 | } | |
559 | ||
560 | static void | |
561 | go32_kill_inferior (void) | |
562 | { | |
53a5351d JM |
563 | redir_cmdline_delete (&child_cmd); |
564 | resume_signal = -1; | |
565 | resume_is_step = 0; | |
e49d4fa6 SS |
566 | unpush_target (&go32_ops); |
567 | } | |
568 | ||
569 | static void | |
570 | go32_create_inferior (char *exec_file, char *args, char **env) | |
571 | { | |
572 | jmp_buf start_state; | |
573 | char *cmdline; | |
574 | char **env_save = environ; | |
575 | ||
0fff5247 EZ |
576 | /* If no exec file handed to us, get it from the exec-file command -- with |
577 | a good, common error message if none is specified. */ | |
578 | if (exec_file == 0) | |
579 | exec_file = get_exec_file (1); | |
580 | ||
e49d4fa6 SS |
581 | if (prog_has_started) |
582 | { | |
b83266a0 | 583 | go32_stop (); |
e49d4fa6 SS |
584 | go32_kill_inferior (); |
585 | } | |
53a5351d JM |
586 | resume_signal = -1; |
587 | resume_is_step = 0; | |
3a45aed8 EZ |
588 | |
589 | /* Initialize child's cwd as empty to be initialized when starting | |
590 | the child. */ | |
591 | *child_cwd = 0; | |
592 | ||
53a5351d JM |
593 | /* Init command line storage. */ |
594 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 AC |
595 | internal_error (__FILE__, __LINE__, |
596 | "Cannot allocate redirection storage: not enough memory.\n"); | |
53a5351d JM |
597 | |
598 | /* Parse the command line and create redirections. */ | |
599 | if (strpbrk (args, "<>")) | |
600 | { | |
601 | if (redir_cmdline_parse (args, &child_cmd) == 0) | |
602 | args = child_cmd.command; | |
603 | else | |
604 | error ("Syntax error in command line."); | |
605 | } | |
606 | else | |
c2d11a7d | 607 | child_cmd.command = xstrdup (args); |
e49d4fa6 SS |
608 | |
609 | cmdline = (char *) alloca (strlen (args) + 4); | |
610 | cmdline[0] = strlen (args); | |
611 | strcpy (cmdline + 1, args); | |
612 | cmdline[strlen (args) + 1] = 13; | |
613 | ||
614 | environ = env; | |
615 | ||
616 | if (v2loadimage (exec_file, cmdline, start_state)) | |
617 | { | |
618 | environ = env_save; | |
619 | printf_unfiltered ("Load failed for image %s\n", exec_file); | |
620 | exit (1); | |
621 | } | |
622 | environ = env_save; | |
623 | ||
624 | edi_init (start_state); | |
53a5351d JM |
625 | #if __DJGPP_MINOR__ < 3 |
626 | save_npx (); | |
627 | #endif | |
e49d4fa6 SS |
628 | |
629 | inferior_pid = SOME_PID; | |
630 | push_target (&go32_ops); | |
631 | clear_proceed_status (); | |
632 | insert_breakpoints (); | |
2acceee2 | 633 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); |
b83266a0 | 634 | prog_has_started = 1; |
e49d4fa6 SS |
635 | } |
636 | ||
637 | static void | |
638 | go32_mourn_inferior (void) | |
639 | { | |
53a5351d JM |
640 | /* We need to make sure all the breakpoint enable bits in the DR7 |
641 | register are reset when the inferior exits. Otherwise, if they | |
642 | rerun the inferior, the uncleared bits may cause random SIGTRAPs, | |
643 | failure to set more watchpoints, and other calamities. It would | |
644 | be nice if GDB itself would take care to remove all breakpoints | |
645 | at all times, but it doesn't, probably under an assumption that | |
646 | the OS cleans up when the debuggee exits. */ | |
647 | cleanup_dregs (); | |
e49d4fa6 SS |
648 | go32_kill_inferior (); |
649 | generic_mourn_inferior (); | |
650 | } | |
651 | ||
652 | static int | |
653 | go32_can_run (void) | |
654 | { | |
655 | return 1; | |
656 | } | |
657 | ||
e49d4fa6 SS |
658 | /* Hardware watchpoint support. */ |
659 | ||
660 | #define DR_STATUS 6 | |
661 | #define DR_CONTROL 7 | |
662 | #define DR_ENABLE_SIZE 2 | |
663 | #define DR_LOCAL_ENABLE_SHIFT 0 | |
664 | #define DR_GLOBAL_ENABLE_SHIFT 1 | |
665 | #define DR_LOCAL_SLOWDOWN 0x100 | |
666 | #define DR_GLOBAL_SLOWDOWN 0x200 | |
667 | #define DR_CONTROL_SHIFT 16 | |
668 | #define DR_CONTROL_SIZE 4 | |
53a5351d | 669 | #define DR_RW_READWRITE 0x3 |
e49d4fa6 SS |
670 | #define DR_RW_WRITE 0x1 |
671 | #define DR_CONTROL_MASK 0xf | |
672 | #define DR_ENABLE_MASK 0x3 | |
673 | #define DR_LEN_1 0x0 | |
674 | #define DR_LEN_2 0x4 | |
675 | #define DR_LEN_4 0xc | |
676 | ||
677 | #define D_REGS edi.dr | |
678 | #define CONTROL D_REGS[DR_CONTROL] | |
679 | #define STATUS D_REGS[DR_STATUS] | |
680 | ||
681 | #define IS_REG_FREE(index) \ | |
53a5351d | 682 | (!(CONTROL & (3 << (DR_ENABLE_SIZE * (index))))) |
e49d4fa6 SS |
683 | |
684 | #define LOCAL_ENABLE_REG(index) \ | |
53a5351d | 685 | (CONTROL |= (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index)))) |
e49d4fa6 SS |
686 | |
687 | #define GLOBAL_ENABLE_REG(index) \ | |
53a5351d | 688 | (CONTROL |= (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index)))) |
e49d4fa6 SS |
689 | |
690 | #define DISABLE_REG(index) \ | |
53a5351d | 691 | (CONTROL &= ~(3 << (DR_ENABLE_SIZE * (index)))) |
e49d4fa6 SS |
692 | |
693 | #define SET_LOCAL_EXACT() \ | |
694 | (CONTROL |= DR_LOCAL_SLOWDOWN) | |
695 | ||
696 | #define SET_GLOBAL_EXACT() \ | |
697 | (CONTROL |= DR_GLOBAL_SLOWDOWN) | |
698 | ||
53a5351d JM |
699 | #define RESET_LOCAL_EXACT() \ |
700 | (CONTROL &= ~(DR_LOCAL_SLOWDOWN)) | |
701 | ||
702 | #define RESET_GLOBAL_EXACT() \ | |
703 | (CONTROL &= ~(DR_GLOBAL_SLOWDOWN)) | |
704 | ||
e49d4fa6 SS |
705 | #define SET_BREAK(index,address) \ |
706 | do {\ | |
53a5351d | 707 | CONTROL &= ~(DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index)));\ |
e49d4fa6 | 708 | D_REGS[index] = address;\ |
c2c6d25f | 709 | dr_ref_count[index]++;\ |
e49d4fa6 SS |
710 | } while(0) |
711 | ||
712 | #define SET_WATCH(index,address,rw,len) \ | |
713 | do {\ | |
714 | SET_BREAK(index,address);\ | |
53a5351d | 715 | CONTROL |= ((len)|(rw)) << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index));\ |
e49d4fa6 SS |
716 | } while (0) |
717 | ||
53a5351d JM |
718 | #define IS_WATCH(index) \ |
719 | (CONTROL & (DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE*(index)))) | |
720 | ||
c2c6d25f | 721 | #define WATCH_HIT(index) ((STATUS & (1 << (index))) && IS_WATCH(index)) |
e49d4fa6 | 722 | |
53a5351d JM |
723 | #define DR_DEF(index) \ |
724 | ((CONTROL >> (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index))) & 0x0f) | |
725 | ||
726 | ||
727 | #if 0 /* use debugging macro */ | |
728 | #define SHOW_DR(text,len) \ | |
e49d4fa6 | 729 | do { \ |
53a5351d | 730 | if (!getenv ("GDB_SHOW_DR")) break; \ |
e49d4fa6 | 731 | fprintf(stderr,"%08x %08x ",edi.dr[7],edi.dr[6]); \ |
53a5351d JM |
732 | fprintf(stderr,"%08x %d %08x %d ", \ |
733 | edi.dr[0],dr_ref_count[0],edi.dr[1],dr_ref_count[1]); \ | |
734 | fprintf(stderr,"%08x %d %08x %d ", \ | |
735 | edi.dr[2],dr_ref_count[2],edi.dr[3],dr_ref_count[3]); \ | |
736 | fprintf(stderr,(len)?"(%s:%d)\n":"(%s)\n",#text,len); \ | |
e49d4fa6 SS |
737 | } while (0) |
738 | #else | |
53a5351d | 739 | #define SHOW_DR(text,len) do {} while (0) |
e49d4fa6 SS |
740 | #endif |
741 | ||
53a5351d JM |
742 | static void |
743 | cleanup_dregs (void) | |
744 | { | |
745 | int i; | |
746 | ||
747 | CONTROL = 0; | |
748 | STATUS = 0; | |
749 | for (i = 0; i < 4; i++) | |
750 | { | |
751 | D_REGS[i] = 0; | |
752 | dr_ref_count[i] = 0; | |
753 | } | |
754 | } | |
755 | ||
e49d4fa6 SS |
756 | /* Insert a watchpoint. */ |
757 | ||
758 | int | |
0fff5247 EZ |
759 | go32_insert_watchpoint (int pid ATTRIBUTE_UNUSED, CORE_ADDR addr, |
760 | int len, int rw) | |
e49d4fa6 | 761 | { |
53a5351d | 762 | int ret = go32_insert_aligned_watchpoint (addr, addr, len, rw); |
e49d4fa6 | 763 | |
53a5351d | 764 | SHOW_DR (insert_watch, len); |
e49d4fa6 SS |
765 | return ret; |
766 | } | |
767 | ||
768 | static int | |
53a5351d | 769 | go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
e49d4fa6 SS |
770 | int len, int rw) |
771 | { | |
772 | int i; | |
773 | int read_write_bits, len_bits; | |
774 | ||
53a5351d JM |
775 | /* Values of rw: 0 - write, 1 - read, 2 - access (read and write). |
776 | However, x86 doesn't support read-only data breakpoints. */ | |
777 | read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE; | |
778 | ||
779 | switch (len) | |
780 | { | |
781 | case 4: | |
782 | len_bits = DR_LEN_4; | |
783 | break; | |
784 | case 2: | |
785 | len_bits = DR_LEN_2; | |
786 | break; | |
787 | case 1: | |
788 | len_bits = DR_LEN_1; | |
789 | break; | |
790 | default: | |
791 | /* The debug registers only have 2 bits for the length, so | |
792 | so this value will always fail the loop below. */ | |
793 | len_bits = 0x10; | |
794 | } | |
795 | ||
796 | /* Look for an occupied debug register with the same address and the | |
797 | same RW and LEN definitions. If we find one, we can use it for | |
798 | this watchpoint as well (and save a register). */ | |
799 | for (i = 0; i < 4; i++) | |
800 | { | |
801 | if (!IS_REG_FREE (i) && D_REGS[i] == addr | |
0fff5247 | 802 | && DR_DEF (i) == (unsigned)(len_bits | read_write_bits)) |
e49d4fa6 | 803 | { |
53a5351d JM |
804 | dr_ref_count[i]++; |
805 | return 0; | |
e49d4fa6 | 806 | } |
53a5351d JM |
807 | } |
808 | ||
809 | /* Look for a free debug register. */ | |
810 | for (i = 0; i <= 3; i++) | |
811 | { | |
812 | if (IS_REG_FREE (i)) | |
813 | break; | |
814 | } | |
e49d4fa6 SS |
815 | |
816 | /* No more debug registers! */ | |
817 | if (i > 3) | |
818 | return -1; | |
819 | ||
53a5351d JM |
820 | if (len == 2) |
821 | { | |
822 | if (addr % 2) | |
823 | return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, | |
824 | len, rw); | |
825 | } | |
e49d4fa6 | 826 | else if (len == 4) |
53a5351d JM |
827 | { |
828 | if (addr % 4) | |
829 | return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, | |
830 | len, rw); | |
831 | } | |
832 | else if (len != 1) | |
833 | return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, len, rw); | |
e49d4fa6 SS |
834 | |
835 | SET_WATCH (i, addr, read_write_bits, len_bits); | |
836 | LOCAL_ENABLE_REG (i); | |
837 | SET_LOCAL_EXACT (); | |
53a5351d JM |
838 | SET_GLOBAL_EXACT (); |
839 | return 0; | |
e49d4fa6 SS |
840 | } |
841 | ||
842 | static int | |
53a5351d | 843 | go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr, CORE_ADDR addr, |
e49d4fa6 SS |
844 | int len, int rw) |
845 | { | |
846 | int align; | |
847 | int size; | |
53a5351d | 848 | int rv = 0, status = 0; |
e49d4fa6 | 849 | |
184a103e | 850 | static int size_try_array[4][4] = |
e49d4fa6 | 851 | { |
184a103e EZ |
852 | { 1, 1, 1, 1 }, /* trying size one */ |
853 | { 2, 1, 2, 1 }, /* trying size two */ | |
854 | { 2, 1, 2, 1 }, /* trying size three */ | |
855 | { 4, 1, 2, 1 } /* trying size four */ | |
e49d4fa6 SS |
856 | }; |
857 | ||
858 | while (len > 0) | |
859 | { | |
860 | align = addr % 4; | |
184a103e EZ |
861 | /* Four is the maximum length a 386 debug register can watch. */ |
862 | size = size_try_array[len > 4 ? 3 : len - 1][align]; | |
53a5351d JM |
863 | if (what == wp_insert) |
864 | status = go32_insert_aligned_watchpoint (waddr, addr, size, rw); | |
865 | else if (what == wp_remove) | |
866 | status = go32_remove_aligned_watchpoint (waddr, addr, size, rw); | |
867 | else if (what == wp_count) | |
868 | rv++; | |
869 | else | |
d03cef9d | 870 | status = EINVAL; |
53a5351d JM |
871 | /* We keep the loop going even after a failure, because some of |
872 | the other aligned watchpoints might still succeed, e.g. if | |
873 | they watch addresses that are already watched, and thus just | |
874 | increment the reference counts of occupied debug registers. | |
875 | If we break out of the loop too early, we could cause those | |
876 | addresses watched by other watchpoints to be disabled when | |
877 | GDB reacts to our failure to insert this watchpoint and tries | |
878 | to remove it. */ | |
879 | if (status) | |
880 | rv = status; | |
e49d4fa6 SS |
881 | addr += size; |
882 | len -= size; | |
883 | } | |
884 | return rv; | |
885 | } | |
886 | ||
887 | /* Remove a watchpoint. */ | |
888 | ||
889 | int | |
0fff5247 EZ |
890 | go32_remove_watchpoint (int pid ATTRIBUTE_UNUSED, CORE_ADDR addr, |
891 | int len, int rw) | |
53a5351d JM |
892 | { |
893 | int ret = go32_remove_aligned_watchpoint (addr, addr, len, rw); | |
894 | ||
895 | SHOW_DR (remove_watch, len); | |
896 | return ret; | |
897 | } | |
898 | ||
899 | static int | |
900 | go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, | |
901 | int len, int rw) | |
e49d4fa6 SS |
902 | { |
903 | int i; | |
53a5351d JM |
904 | int read_write_bits, len_bits; |
905 | ||
906 | /* Values of rw: 0 - write, 1 - read, 2 - access (read and write). | |
907 | However, x86 doesn't support read-only data breakpoints. */ | |
908 | read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE; | |
909 | ||
910 | switch (len) | |
911 | { | |
912 | case 4: | |
913 | len_bits = DR_LEN_4; | |
914 | break; | |
915 | case 2: | |
916 | len_bits = DR_LEN_2; | |
917 | break; | |
918 | case 1: | |
919 | len_bits = DR_LEN_1; | |
920 | break; | |
921 | default: | |
922 | /* The debug registers only have 2 bits for the length, so | |
923 | so this value will always fail the loop below. */ | |
924 | len_bits = 0x10; | |
925 | } | |
926 | ||
927 | if (len == 2) | |
928 | { | |
929 | if (addr % 2) | |
930 | return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, | |
931 | len, rw); | |
932 | } | |
933 | else if (len == 4) | |
934 | { | |
935 | if (addr % 4) | |
936 | return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, | |
937 | len, rw); | |
938 | } | |
939 | else if (len != 1) | |
940 | return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, len, rw); | |
e49d4fa6 SS |
941 | |
942 | for (i = 0; i <= 3; i++) | |
943 | { | |
53a5351d | 944 | if (!IS_REG_FREE (i) && D_REGS[i] == addr |
0fff5247 | 945 | && DR_DEF (i) == (unsigned)(len_bits | read_write_bits)) |
e49d4fa6 | 946 | { |
53a5351d JM |
947 | dr_ref_count[i]--; |
948 | if (dr_ref_count[i] == 0) | |
949 | DISABLE_REG (i); | |
e49d4fa6 SS |
950 | } |
951 | } | |
53a5351d JM |
952 | RESET_LOCAL_EXACT (); |
953 | RESET_GLOBAL_EXACT (); | |
e49d4fa6 SS |
954 | |
955 | return 0; | |
956 | } | |
957 | ||
53a5351d JM |
958 | /* Can we use debug registers to watch a region whose address is ADDR |
959 | and whose length is LEN bytes? */ | |
960 | ||
961 | int | |
962 | go32_region_ok_for_watchpoint (CORE_ADDR addr, int len) | |
963 | { | |
964 | /* Compute how many aligned watchpoints we would need to cover this | |
965 | region. */ | |
966 | int nregs = go32_handle_nonaligned_watchpoint (wp_count, addr, addr, len, 0); | |
967 | ||
968 | return nregs <= 4 ? 1 : 0; | |
969 | } | |
970 | ||
971 | /* Check if stopped by a data watchpoint. If so, return the address | |
972 | whose access triggered the watchpoint. */ | |
e49d4fa6 SS |
973 | |
974 | CORE_ADDR | |
0fff5247 | 975 | go32_stopped_by_watchpoint (int pid ATTRIBUTE_UNUSED, int data_watchpoint) |
e49d4fa6 SS |
976 | { |
977 | int i, ret = 0; | |
978 | int status; | |
979 | ||
980 | status = edi.dr[DR_STATUS]; | |
53a5351d | 981 | SHOW_DR (stopped_by, 0); |
e49d4fa6 SS |
982 | for (i = 0; i <= 3; i++) |
983 | { | |
53a5351d | 984 | if (WATCH_HIT (i) && data_watchpoint) |
e49d4fa6 | 985 | { |
53a5351d | 986 | SHOW_DR (WP_HIT, 0); |
e49d4fa6 SS |
987 | ret = D_REGS[i]; |
988 | } | |
989 | } | |
e49d4fa6 SS |
990 | |
991 | return ret; | |
992 | } | |
993 | ||
994 | /* Remove a breakpoint. */ | |
995 | ||
996 | int | |
0fff5247 | 997 | go32_remove_hw_breakpoint (CORE_ADDR addr, void *shadow ATTRIBUTE_UNUSED) |
e49d4fa6 SS |
998 | { |
999 | int i; | |
1000 | for (i = 0; i <= 3; i++) | |
1001 | { | |
53a5351d | 1002 | if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0) |
e49d4fa6 | 1003 | { |
53a5351d JM |
1004 | dr_ref_count[i]--; |
1005 | if (dr_ref_count[i] == 0) | |
1006 | DISABLE_REG (i); | |
e49d4fa6 SS |
1007 | } |
1008 | } | |
53a5351d | 1009 | SHOW_DR (remove_hw, 0); |
e49d4fa6 SS |
1010 | return 0; |
1011 | } | |
1012 | ||
1013 | int | |
0fff5247 | 1014 | go32_insert_hw_breakpoint (CORE_ADDR addr, void *shadow ATTRIBUTE_UNUSED) |
e49d4fa6 SS |
1015 | { |
1016 | int i; | |
e49d4fa6 | 1017 | |
53a5351d JM |
1018 | /* Look for an occupied debug register with the same address and the |
1019 | same RW and LEN definitions. If we find one, we can use it for | |
1020 | this breakpoint as well (and save a register). */ | |
1021 | for (i = 0; i < 4; i++) | |
1022 | { | |
1023 | if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0) | |
1024 | { | |
1025 | dr_ref_count[i]++; | |
1026 | SHOW_DR (insert_hw, 0); | |
1027 | return 0; | |
1028 | } | |
1029 | } | |
1030 | ||
e49d4fa6 SS |
1031 | /* Look for a free debug register. */ |
1032 | for (i = 0; i <= 3; i++) | |
1033 | { | |
1034 | if (IS_REG_FREE (i)) | |
1035 | break; | |
1036 | } | |
1037 | ||
53a5351d JM |
1038 | /* No more debug registers? */ |
1039 | if (i < 4) | |
1040 | { | |
1041 | SET_BREAK (i, addr); | |
1042 | LOCAL_ENABLE_REG (i); | |
1043 | } | |
1044 | SHOW_DR (insert_hw, 0); | |
e49d4fa6 | 1045 | |
d03cef9d | 1046 | return i < 4 ? 0 : EBUSY; |
e49d4fa6 SS |
1047 | } |
1048 | ||
53a5351d JM |
1049 | /* Put the device open on handle FD into either raw or cooked |
1050 | mode, return 1 if it was in raw mode, zero otherwise. */ | |
1051 | ||
1052 | static int | |
1053 | device_mode (int fd, int raw_p) | |
1054 | { | |
1055 | int oldmode, newmode; | |
1056 | __dpmi_regs regs; | |
1057 | ||
1058 | regs.x.ax = 0x4400; | |
1059 | regs.x.bx = fd; | |
1060 | __dpmi_int (0x21, ®s); | |
1061 | if (regs.x.flags & 1) | |
1062 | return -1; | |
1063 | newmode = oldmode = regs.x.dx; | |
1064 | ||
1065 | if (raw_p) | |
1066 | newmode |= 0x20; | |
1067 | else | |
1068 | newmode &= ~0x20; | |
1069 | ||
1070 | if (oldmode & 0x80) /* Only for character dev */ | |
1071 | { | |
1072 | regs.x.ax = 0x4401; | |
1073 | regs.x.bx = fd; | |
1074 | regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails */ | |
1075 | __dpmi_int (0x21, ®s); | |
1076 | if (regs.x.flags & 1) | |
1077 | return -1; | |
1078 | } | |
1079 | return (oldmode & 0x20) == 0x20; | |
1080 | } | |
1081 | ||
1082 | ||
1083 | static int inf_mode_valid = 0; | |
1084 | static int inf_terminal_mode; | |
1085 | ||
1086 | /* This semaphore is needed because, amazingly enough, GDB calls | |
1087 | target.to_terminal_ours more than once after the inferior stops. | |
1088 | But we need the information from the first call only, since the | |
1089 | second call will always see GDB's own cooked terminal. */ | |
1090 | static int terminal_is_ours = 1; | |
1091 | ||
cce74817 JM |
1092 | static void |
1093 | go32_terminal_init (void) | |
1094 | { | |
53a5351d JM |
1095 | inf_mode_valid = 0; /* reinitialize, in case they are restarting child */ |
1096 | terminal_is_ours = 1; | |
cce74817 JM |
1097 | } |
1098 | ||
1099 | static void | |
0fff5247 | 1100 | go32_terminal_info (char *args ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED) |
cce74817 | 1101 | { |
53a5351d JM |
1102 | printf_unfiltered ("Inferior's terminal is in %s mode.\n", |
1103 | !inf_mode_valid | |
1104 | ? "default" : inf_terminal_mode ? "raw" : "cooked"); | |
1105 | ||
1106 | #if __DJGPP_MINOR__ > 2 | |
1107 | if (child_cmd.redirection) | |
1108 | { | |
1109 | int i; | |
1110 | ||
1111 | for (i = 0; i < DBG_HANDLES; i++) | |
c5aa993b | 1112 | { |
53a5351d JM |
1113 | if (child_cmd.redirection[i]->file_name) |
1114 | printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n", | |
1115 | i, child_cmd.redirection[i]->file_name); | |
1116 | else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1) | |
1117 | printf_unfiltered | |
1118 | ("\tFile handle %d appears to be closed by inferior.\n", i); | |
1119 | /* Mask off the raw/cooked bit when comparing device info words. */ | |
1120 | else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf) | |
1121 | != (_get_dev_info (i) & 0xdf)) | |
1122 | printf_unfiltered | |
1123 | ("\tFile handle %d appears to be redirected by inferior.\n", i); | |
c5aa993b | 1124 | } |
53a5351d JM |
1125 | } |
1126 | #endif | |
1127 | } | |
1128 | ||
1129 | static void | |
1130 | go32_terminal_inferior (void) | |
1131 | { | |
1132 | /* Redirect standard handles as child wants them. */ | |
1133 | errno = 0; | |
1134 | if (redir_to_child (&child_cmd) == -1) | |
1135 | { | |
1136 | redir_to_debugger (&child_cmd); | |
1137 | error ("Cannot redirect standard handles for program: %s.", | |
1138 | strerror (errno)); | |
1139 | } | |
1140 | /* set the console device of the inferior to whatever mode | |
1141 | (raw or cooked) we found it last time */ | |
1142 | if (terminal_is_ours) | |
1143 | { | |
1144 | if (inf_mode_valid) | |
1145 | device_mode (0, inf_terminal_mode); | |
1146 | terminal_is_ours = 0; | |
1147 | } | |
cce74817 JM |
1148 | } |
1149 | ||
1150 | static void | |
1151 | go32_terminal_ours (void) | |
1152 | { | |
53a5351d JM |
1153 | /* Switch to cooked mode on the gdb terminal and save the inferior |
1154 | terminal mode to be restored when it is resumed */ | |
1155 | if (!terminal_is_ours) | |
1156 | { | |
1157 | inf_terminal_mode = device_mode (0, 0); | |
1158 | if (inf_terminal_mode != -1) | |
1159 | inf_mode_valid = 1; | |
1160 | else | |
1161 | /* If device_mode returned -1, we don't know what happens with | |
1162 | handle 0 anymore, so make the info invalid. */ | |
1163 | inf_mode_valid = 0; | |
1164 | terminal_is_ours = 1; | |
1165 | ||
1166 | /* Restore debugger's standard handles. */ | |
1167 | errno = 0; | |
1168 | if (redir_to_debugger (&child_cmd) == -1) | |
1169 | { | |
1170 | redir_to_child (&child_cmd); | |
1171 | error ("Cannot redirect standard handles for debugger: %s.", | |
1172 | strerror (errno)); | |
1173 | } | |
1174 | } | |
cce74817 JM |
1175 | } |
1176 | ||
e49d4fa6 SS |
1177 | static void |
1178 | init_go32_ops (void) | |
1179 | { | |
1180 | go32_ops.to_shortname = "djgpp"; | |
1181 | go32_ops.to_longname = "djgpp target process"; | |
1182 | go32_ops.to_doc = | |
1183 | "Program loaded by djgpp, when gdb is used as an external debugger"; | |
1184 | go32_ops.to_open = go32_open; | |
1185 | go32_ops.to_close = go32_close; | |
53a5351d | 1186 | go32_ops.to_attach = go32_attach; |
e49d4fa6 SS |
1187 | go32_ops.to_detach = go32_detach; |
1188 | go32_ops.to_resume = go32_resume; | |
1189 | go32_ops.to_wait = go32_wait; | |
1190 | go32_ops.to_fetch_registers = go32_fetch_registers; | |
1191 | go32_ops.to_store_registers = go32_store_registers; | |
1192 | go32_ops.to_prepare_to_store = go32_prepare_to_store; | |
1193 | go32_ops.to_xfer_memory = go32_xfer_memory; | |
1194 | go32_ops.to_files_info = go32_files_info; | |
1195 | go32_ops.to_insert_breakpoint = memory_insert_breakpoint; | |
1196 | go32_ops.to_remove_breakpoint = memory_remove_breakpoint; | |
cce74817 JM |
1197 | go32_ops.to_terminal_init = go32_terminal_init; |
1198 | go32_ops.to_terminal_inferior = go32_terminal_inferior; | |
53a5351d | 1199 | go32_ops.to_terminal_ours_for_output = go32_terminal_ours; |
cce74817 | 1200 | go32_ops.to_terminal_ours = go32_terminal_ours; |
53a5351d | 1201 | go32_ops.to_terminal_info = go32_terminal_info; |
e49d4fa6 SS |
1202 | go32_ops.to_kill = go32_kill_inferior; |
1203 | go32_ops.to_create_inferior = go32_create_inferior; | |
1204 | go32_ops.to_mourn_inferior = go32_mourn_inferior; | |
1205 | go32_ops.to_can_run = go32_can_run; | |
1206 | go32_ops.to_stop = go32_stop; | |
1207 | go32_ops.to_stratum = process_stratum; | |
1208 | go32_ops.to_has_all_memory = 1; | |
1209 | go32_ops.to_has_memory = 1; | |
1210 | go32_ops.to_has_stack = 1; | |
1211 | go32_ops.to_has_registers = 1; | |
1212 | go32_ops.to_has_execution = 1; | |
1213 | go32_ops.to_magic = OPS_MAGIC; | |
53a5351d | 1214 | |
3a45aed8 EZ |
1215 | /* Initialize child's cwd as empty to be initialized when starting |
1216 | the child. */ | |
1217 | *child_cwd = 0; | |
53a5351d JM |
1218 | |
1219 | /* Initialize child's command line storage. */ | |
1220 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 AC |
1221 | internal_error (__FILE__, __LINE__, |
1222 | "Cannot allocate redirection storage: not enough memory.\n"); | |
0fff5247 EZ |
1223 | |
1224 | /* We are always processing GCC-compiled programs. */ | |
1225 | processing_gcc_compilation = 2; | |
e49d4fa6 SS |
1226 | } |
1227 | ||
1228 | void | |
1229 | _initialize_go32_nat (void) | |
1230 | { | |
1231 | init_go32_ops (); | |
1232 | add_target (&go32_ops); | |
1233 | } | |
53a5351d JM |
1234 | |
1235 | pid_t | |
1236 | tcgetpgrp (int fd) | |
1237 | { | |
1238 | if (isatty (fd)) | |
1239 | return SOME_PID; | |
1240 | errno = ENOTTY; | |
1241 | return -1; | |
1242 | } | |
1243 | ||
1244 | int | |
1245 | tcsetpgrp (int fd, pid_t pgid) | |
1246 | { | |
1247 | if (isatty (fd) && pgid == SOME_PID) | |
1248 | return 0; | |
1249 | errno = pgid == SOME_PID ? ENOTTY : ENOSYS; | |
1250 | return -1; | |
1251 | } |