Commit | Line | Data |
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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" |
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); | |
53a5351d | 169 | static void cleanup_dregs (void); |
c5aa993b JM |
170 | static void go32_mourn_inferior (void); |
171 | static int go32_can_run (void); | |
53a5351d JM |
172 | static int go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
173 | int len, int rw); | |
174 | static int go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, | |
175 | int len, int rw); | |
176 | static int go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr, | |
177 | CORE_ADDR addr, int len, int rw); | |
b83266a0 SS |
178 | |
179 | static struct target_ops go32_ops; | |
c5aa993b JM |
180 | static void go32_terminal_init (void); |
181 | static void go32_terminal_inferior (void); | |
182 | static void go32_terminal_ours (void); | |
e49d4fa6 | 183 | |
53a5351d | 184 | #define r_ofs(x) (offsetof(TSS,x)) |
e49d4fa6 SS |
185 | |
186 | static struct | |
187 | { | |
53a5351d JM |
188 | size_t tss_ofs; |
189 | size_t size; | |
e49d4fa6 SS |
190 | } |
191 | regno_mapping[] = | |
192 | { | |
0fff5247 EZ |
193 | {r_ofs (tss_eax), 4}, /* normal registers, from a_tss */ |
194 | {r_ofs (tss_ecx), 4}, | |
195 | {r_ofs (tss_edx), 4}, | |
196 | {r_ofs (tss_ebx), 4}, | |
197 | {r_ofs (tss_esp), 4}, | |
198 | {r_ofs (tss_ebp), 4}, | |
199 | {r_ofs (tss_esi), 4}, | |
200 | {r_ofs (tss_edi), 4}, | |
201 | {r_ofs (tss_eip), 4}, | |
202 | {r_ofs (tss_eflags), 4}, | |
203 | {r_ofs (tss_cs), 2}, | |
204 | {r_ofs (tss_ss), 2}, | |
205 | {r_ofs (tss_ds), 2}, | |
206 | {r_ofs (tss_es), 2}, | |
207 | {r_ofs (tss_fs), 2}, | |
208 | {r_ofs (tss_gs), 2}, | |
209 | {0, 10}, /* 8 FP registers, from npx.reg[] */ | |
210 | {1, 10}, | |
211 | {2, 10}, | |
212 | {3, 10}, | |
213 | {4, 10}, | |
214 | {5, 10}, | |
215 | {6, 10}, | |
216 | {7, 10}, | |
53a5351d | 217 | /* The order of the next 7 registers must be consistent |
0fff5247 EZ |
218 | with their numbering in config/i386/tm-i386.h, which see. */ |
219 | {0, 2}, /* control word, from npx */ | |
220 | {4, 2}, /* status word, from npx */ | |
221 | {8, 2}, /* tag word, from npx */ | |
222 | {16, 2}, /* last FP exception CS from npx */ | |
223 | {12, 4}, /* last FP exception EIP from npx */ | |
224 | {24, 2}, /* last FP exception operand selector from npx */ | |
225 | {20, 4}, /* last FP exception operand offset from npx */ | |
226 | {18, 2} /* last FP opcode from npx */ | |
e49d4fa6 SS |
227 | }; |
228 | ||
229 | static struct | |
230 | { | |
231 | int go32_sig; | |
0fff5247 | 232 | enum target_signal gdb_sig; |
e49d4fa6 SS |
233 | } |
234 | sig_map[] = | |
235 | { | |
0fff5247 EZ |
236 | {0, TARGET_SIGNAL_FPE}, |
237 | {1, TARGET_SIGNAL_TRAP}, | |
53a5351d JM |
238 | /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL, |
239 | but I think SIGBUS is better, since the NMI is usually activated | |
240 | as a result of a memory parity check failure. */ | |
0fff5247 EZ |
241 | {2, TARGET_SIGNAL_BUS}, |
242 | {3, TARGET_SIGNAL_TRAP}, | |
243 | {4, TARGET_SIGNAL_FPE}, | |
244 | {5, TARGET_SIGNAL_SEGV}, | |
245 | {6, TARGET_SIGNAL_ILL}, | |
246 | {7, TARGET_SIGNAL_EMT}, /* no-coprocessor exception */ | |
247 | {8, TARGET_SIGNAL_SEGV}, | |
248 | {9, TARGET_SIGNAL_SEGV}, | |
249 | {10, TARGET_SIGNAL_BUS}, | |
250 | {11, TARGET_SIGNAL_SEGV}, | |
251 | {12, TARGET_SIGNAL_SEGV}, | |
252 | {13, TARGET_SIGNAL_SEGV}, | |
253 | {14, TARGET_SIGNAL_SEGV}, | |
254 | {16, TARGET_SIGNAL_FPE}, | |
255 | {17, TARGET_SIGNAL_BUS}, | |
256 | {31, TARGET_SIGNAL_ILL}, | |
257 | {0x1b, TARGET_SIGNAL_INT}, | |
258 | {0x75, TARGET_SIGNAL_FPE}, | |
259 | {0x78, TARGET_SIGNAL_ALRM}, | |
260 | {0x79, TARGET_SIGNAL_INT}, | |
261 | {0x7a, TARGET_SIGNAL_QUIT}, | |
262 | {-1, TARGET_SIGNAL_LAST} | |
e49d4fa6 SS |
263 | }; |
264 | ||
53a5351d JM |
265 | static struct { |
266 | enum target_signal gdb_sig; | |
267 | int djgpp_excepno; | |
268 | } excepn_map[] = { | |
0fff5247 EZ |
269 | {TARGET_SIGNAL_0, -1}, |
270 | {TARGET_SIGNAL_ILL, 6}, /* Invalid Opcode */ | |
271 | {TARGET_SIGNAL_EMT, 7}, /* triggers SIGNOFP */ | |
272 | {TARGET_SIGNAL_SEGV, 13}, /* GPF */ | |
273 | {TARGET_SIGNAL_BUS, 17}, /* Alignment Check */ | |
53a5351d JM |
274 | /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for |
275 | details. */ | |
0fff5247 EZ |
276 | {TARGET_SIGNAL_TERM, 0x1b}, /* triggers Ctrl-Break type of SIGINT */ |
277 | {TARGET_SIGNAL_FPE, 0x75}, | |
278 | {TARGET_SIGNAL_INT, 0x79}, | |
279 | {TARGET_SIGNAL_QUIT, 0x7a}, | |
280 | {TARGET_SIGNAL_ALRM, 0x78}, /* triggers SIGTIMR */ | |
281 | {TARGET_SIGNAL_PROF, 0x78}, | |
282 | {TARGET_SIGNAL_LAST, -1} | |
53a5351d JM |
283 | }; |
284 | ||
e49d4fa6 | 285 | static void |
0fff5247 | 286 | go32_open (char *name ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED) |
e49d4fa6 | 287 | { |
53a5351d | 288 | printf_unfiltered ("Done. Use the \"run\" command to run the program.\n"); |
e49d4fa6 SS |
289 | } |
290 | ||
291 | static void | |
0fff5247 | 292 | go32_close (int quitting ATTRIBUTE_UNUSED) |
e49d4fa6 SS |
293 | { |
294 | } | |
295 | ||
296 | static void | |
0fff5247 | 297 | go32_attach (char *args ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED) |
e49d4fa6 | 298 | { |
53a5351d JM |
299 | error ("\ |
300 | You cannot attach to a running program on this platform.\n\ | |
301 | Use the `run' command to run DJGPP programs."); | |
e49d4fa6 SS |
302 | } |
303 | ||
304 | static void | |
0fff5247 | 305 | go32_detach (char *args ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED) |
e49d4fa6 SS |
306 | { |
307 | } | |
308 | ||
309 | static int resume_is_step; | |
53a5351d | 310 | static int resume_signal = -1; |
e49d4fa6 SS |
311 | |
312 | static void | |
0fff5247 | 313 | go32_resume (int pid ATTRIBUTE_UNUSED, int step, enum target_signal siggnal) |
c5aa993b | 314 | { |
53a5351d JM |
315 | int i; |
316 | ||
c5aa993b | 317 | resume_is_step = step; |
53a5351d JM |
318 | |
319 | if (siggnal != TARGET_SIGNAL_0 && siggnal != TARGET_SIGNAL_TRAP) | |
320 | { | |
0fff5247 EZ |
321 | for (i = 0, resume_signal = -1; |
322 | excepn_map[i].gdb_sig != TARGET_SIGNAL_LAST; i++) | |
53a5351d JM |
323 | if (excepn_map[i].gdb_sig == siggnal) |
324 | { | |
325 | resume_signal = excepn_map[i].djgpp_excepno; | |
326 | break; | |
327 | } | |
328 | if (resume_signal == -1) | |
329 | printf_unfiltered ("Cannot deliver signal %s on this platform.\n", | |
330 | target_signal_to_name (siggnal)); | |
331 | } | |
c5aa993b | 332 | } |
e49d4fa6 | 333 | |
53a5351d JM |
334 | static char child_cwd[FILENAME_MAX]; |
335 | ||
e49d4fa6 | 336 | static int |
0fff5247 | 337 | go32_wait (int pid ATTRIBUTE_UNUSED, struct target_waitstatus *status) |
e49d4fa6 SS |
338 | { |
339 | int i; | |
53a5351d | 340 | unsigned char saved_opcode; |
0fff5247 | 341 | unsigned long INT3_addr = 0; |
53a5351d | 342 | int stepping_over_INT = 0; |
e49d4fa6 | 343 | |
53a5351d | 344 | a_tss.tss_eflags &= 0xfeff; /* reset the single-step flag (TF) */ |
e49d4fa6 | 345 | if (resume_is_step) |
53a5351d JM |
346 | { |
347 | /* If the next instruction is INT xx or INTO, we need to handle | |
348 | them specially. Intel manuals say that these instructions | |
349 | reset the single-step flag (a.k.a. TF). However, it seems | |
350 | that, at least in the DPMI environment, and at least when | |
351 | stepping over the DPMI interrupt 31h, the problem is having | |
352 | TF set at all when INT 31h is executed: the debuggee either | |
353 | crashes (and takes the system with it) or is killed by a | |
354 | SIGTRAP. | |
355 | ||
356 | So we need to emulate single-step mode: we put an INT3 opcode | |
357 | right after the INT xx instruction, let the debuggee run | |
358 | until it hits INT3 and stops, then restore the original | |
359 | instruction which we overwrote with the INT3 opcode, and back | |
360 | up the debuggee's EIP to that instruction. */ | |
361 | read_child (a_tss.tss_eip, &saved_opcode, 1); | |
362 | if (saved_opcode == 0xCD || saved_opcode == 0xCE) | |
363 | { | |
364 | unsigned char INT3_opcode = 0xCC; | |
365 | ||
366 | INT3_addr | |
367 | = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1; | |
368 | stepping_over_INT = 1; | |
369 | read_child (INT3_addr, &saved_opcode, 1); | |
370 | write_child (INT3_addr, &INT3_opcode, 1); | |
371 | } | |
372 | else | |
373 | a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */ | |
374 | } | |
375 | ||
376 | /* The special value FFFFh in tss_trap indicates to run_child that | |
377 | tss_irqn holds a signal to be delivered to the debuggee. */ | |
378 | if (resume_signal <= -1) | |
379 | { | |
380 | a_tss.tss_trap = 0; | |
381 | a_tss.tss_irqn = 0xff; | |
382 | } | |
e49d4fa6 | 383 | else |
53a5351d JM |
384 | { |
385 | a_tss.tss_trap = 0xffff; /* run_child looks for this */ | |
386 | a_tss.tss_irqn = resume_signal; | |
387 | } | |
388 | ||
389 | /* The child might change working directory behind our back. The | |
390 | GDB users won't like the side effects of that when they work with | |
391 | relative file names, and GDB might be confused by its current | |
392 | directory not being in sync with the truth. So we always make a | |
393 | point of changing back to where GDB thinks is its cwd, when we | |
394 | return control to the debugger, but restore child's cwd before we | |
395 | run it. */ | |
3a45aed8 EZ |
396 | /* Initialize child_cwd, before the first call to run_child and not |
397 | in the initialization, so the child get also the changed directory | |
398 | set with the gdb-command "cd ..." */ | |
399 | if (!*child_cwd) | |
400 | /* Initialize child's cwd with the current one. */ | |
401 | getcwd (child_cwd, sizeof (child_cwd)); | |
402 | ||
53a5351d | 403 | chdir (child_cwd); |
e49d4fa6 | 404 | |
b83266a0 | 405 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 406 | load_npx (); |
b83266a0 | 407 | #endif |
e49d4fa6 | 408 | run_child (); |
b83266a0 | 409 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 410 | save_npx (); |
b83266a0 | 411 | #endif |
e49d4fa6 | 412 | |
53a5351d JM |
413 | /* Did we step over an INT xx instruction? */ |
414 | if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1) | |
415 | { | |
416 | /* Restore the original opcode. */ | |
417 | a_tss.tss_eip--; /* EIP points *after* the INT3 instruction */ | |
418 | write_child (a_tss.tss_eip, &saved_opcode, 1); | |
419 | /* Simulate a TRAP exception. */ | |
420 | a_tss.tss_irqn = 1; | |
421 | a_tss.tss_eflags |= 0x0100; | |
422 | } | |
423 | ||
424 | getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */ | |
425 | chdir (current_directory); | |
426 | ||
e49d4fa6 SS |
427 | if (a_tss.tss_irqn == 0x21) |
428 | { | |
429 | status->kind = TARGET_WAITKIND_EXITED; | |
430 | status->value.integer = a_tss.tss_eax & 0xff; | |
431 | } | |
432 | else | |
433 | { | |
434 | status->value.sig = TARGET_SIGNAL_UNKNOWN; | |
435 | status->kind = TARGET_WAITKIND_STOPPED; | |
436 | for (i = 0; sig_map[i].go32_sig != -1; i++) | |
437 | { | |
438 | if (a_tss.tss_irqn == sig_map[i].go32_sig) | |
439 | { | |
53a5351d | 440 | #if __DJGPP_MINOR__ < 3 |
e49d4fa6 SS |
441 | if ((status->value.sig = sig_map[i].gdb_sig) != |
442 | TARGET_SIGNAL_TRAP) | |
443 | status->kind = TARGET_WAITKIND_SIGNALLED; | |
53a5351d JM |
444 | #else |
445 | status->value.sig = sig_map[i].gdb_sig; | |
446 | #endif | |
e49d4fa6 SS |
447 | break; |
448 | } | |
449 | } | |
450 | } | |
451 | return SOME_PID; | |
452 | } | |
453 | ||
454 | static void | |
89dea5aa | 455 | fetch_register (int regno) |
e49d4fa6 | 456 | { |
89dea5aa EZ |
457 | if (regno < FP0_REGNUM) |
458 | supply_register (regno, (char *) &a_tss + regno_mapping[regno].tss_ofs); | |
459 | else if (regno <= LAST_FPU_CTRL_REGNUM) | |
460 | i387_supply_register (regno, (char *) &npx); | |
461 | else | |
462 | internal_error (__FILE__, __LINE__, | |
463 | "Invalid register no. %d in fetch_register.", regno); | |
464 | } | |
e49d4fa6 | 465 | |
89dea5aa EZ |
466 | static void |
467 | go32_fetch_registers (int regno) | |
468 | { | |
469 | if (regno >= 0) | |
470 | fetch_register (regno); | |
471 | else | |
e49d4fa6 | 472 | { |
89dea5aa EZ |
473 | for (regno = 0; regno < FP0_REGNUM; regno++) |
474 | fetch_register (regno); | |
475 | i387_supply_fsave ((char *) &npx); | |
e49d4fa6 SS |
476 | } |
477 | } | |
478 | ||
479 | static void | |
480 | store_register (int regno) | |
481 | { | |
482 | void *rp; | |
483 | void *v = (void *) ®isters[REGISTER_BYTE (regno)]; | |
484 | ||
89dea5aa EZ |
485 | if (regno < FP0_REGNUM) |
486 | memcpy ((char *) &a_tss + regno_mapping[regno].tss_ofs, | |
487 | v, regno_mapping[regno].size); | |
488 | else if (regno <= LAST_FPU_CTRL_REGNUM) | |
489 | i387_fill_fsave ((char *)&npx, regno); | |
e49d4fa6 | 490 | else |
8e65ff28 AC |
491 | internal_error (__FILE__, __LINE__, |
492 | "Invalid register no. %d in store_register.", regno); | |
e49d4fa6 SS |
493 | } |
494 | ||
495 | static void | |
496 | go32_store_registers (int regno) | |
497 | { | |
0fff5247 | 498 | unsigned r; |
e49d4fa6 SS |
499 | |
500 | if (regno >= 0) | |
501 | store_register (regno); | |
502 | else | |
503 | { | |
89dea5aa | 504 | for (r = 0; r < FP0_REGNUM; r++) |
e49d4fa6 | 505 | store_register (r); |
89dea5aa | 506 | i387_fill_fsave ((char *) &npx, -1); |
e49d4fa6 SS |
507 | } |
508 | } | |
509 | ||
510 | static void | |
511 | go32_prepare_to_store (void) | |
512 | { | |
513 | } | |
514 | ||
515 | static int | |
516 | go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
a17b5c4e | 517 | struct mem_attrib *attrib ATTRIBUTE_UNUSED, |
0fff5247 | 518 | struct target_ops *target ATTRIBUTE_UNUSED) |
e49d4fa6 SS |
519 | { |
520 | if (write) | |
521 | { | |
522 | if (write_child (memaddr, myaddr, len)) | |
523 | { | |
524 | return 0; | |
525 | } | |
526 | else | |
527 | { | |
528 | return len; | |
529 | } | |
530 | } | |
531 | else | |
532 | { | |
533 | if (read_child (memaddr, myaddr, len)) | |
534 | { | |
535 | return 0; | |
536 | } | |
537 | else | |
538 | { | |
539 | return len; | |
540 | } | |
541 | } | |
542 | } | |
543 | ||
53a5351d JM |
544 | static cmdline_t child_cmd; /* parsed child's command line kept here */ |
545 | ||
e49d4fa6 | 546 | static void |
0fff5247 | 547 | go32_files_info (struct target_ops *target ATTRIBUTE_UNUSED) |
e49d4fa6 | 548 | { |
53a5351d | 549 | printf_unfiltered ("You are running a DJGPP V2 program.\n"); |
e49d4fa6 SS |
550 | } |
551 | ||
552 | static void | |
553 | go32_stop (void) | |
554 | { | |
555 | normal_stop (); | |
556 | cleanup_client (); | |
557 | inferior_pid = 0; | |
558 | prog_has_started = 0; | |
559 | } | |
560 | ||
561 | static void | |
562 | go32_kill_inferior (void) | |
563 | { | |
53a5351d JM |
564 | redir_cmdline_delete (&child_cmd); |
565 | resume_signal = -1; | |
566 | resume_is_step = 0; | |
e49d4fa6 SS |
567 | unpush_target (&go32_ops); |
568 | } | |
569 | ||
570 | static void | |
571 | go32_create_inferior (char *exec_file, char *args, char **env) | |
572 | { | |
573 | jmp_buf start_state; | |
574 | char *cmdline; | |
575 | char **env_save = environ; | |
576 | ||
0fff5247 EZ |
577 | /* If no exec file handed to us, get it from the exec-file command -- with |
578 | a good, common error message if none is specified. */ | |
579 | if (exec_file == 0) | |
580 | exec_file = get_exec_file (1); | |
581 | ||
e49d4fa6 SS |
582 | if (prog_has_started) |
583 | { | |
b83266a0 | 584 | go32_stop (); |
e49d4fa6 SS |
585 | go32_kill_inferior (); |
586 | } | |
53a5351d JM |
587 | resume_signal = -1; |
588 | resume_is_step = 0; | |
3a45aed8 EZ |
589 | |
590 | /* Initialize child's cwd as empty to be initialized when starting | |
591 | the child. */ | |
592 | *child_cwd = 0; | |
593 | ||
53a5351d JM |
594 | /* Init command line storage. */ |
595 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 AC |
596 | internal_error (__FILE__, __LINE__, |
597 | "Cannot allocate redirection storage: not enough memory.\n"); | |
53a5351d JM |
598 | |
599 | /* Parse the command line and create redirections. */ | |
600 | if (strpbrk (args, "<>")) | |
601 | { | |
602 | if (redir_cmdline_parse (args, &child_cmd) == 0) | |
603 | args = child_cmd.command; | |
604 | else | |
605 | error ("Syntax error in command line."); | |
606 | } | |
607 | else | |
c2d11a7d | 608 | child_cmd.command = xstrdup (args); |
e49d4fa6 SS |
609 | |
610 | cmdline = (char *) alloca (strlen (args) + 4); | |
611 | cmdline[0] = strlen (args); | |
612 | strcpy (cmdline + 1, args); | |
613 | cmdline[strlen (args) + 1] = 13; | |
614 | ||
615 | environ = env; | |
616 | ||
617 | if (v2loadimage (exec_file, cmdline, start_state)) | |
618 | { | |
619 | environ = env_save; | |
620 | printf_unfiltered ("Load failed for image %s\n", exec_file); | |
621 | exit (1); | |
622 | } | |
623 | environ = env_save; | |
624 | ||
625 | edi_init (start_state); | |
53a5351d JM |
626 | #if __DJGPP_MINOR__ < 3 |
627 | save_npx (); | |
628 | #endif | |
e49d4fa6 SS |
629 | |
630 | inferior_pid = SOME_PID; | |
631 | push_target (&go32_ops); | |
632 | clear_proceed_status (); | |
633 | insert_breakpoints (); | |
2acceee2 | 634 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); |
b83266a0 | 635 | prog_has_started = 1; |
e49d4fa6 SS |
636 | } |
637 | ||
638 | static void | |
639 | go32_mourn_inferior (void) | |
640 | { | |
53a5351d JM |
641 | /* We need to make sure all the breakpoint enable bits in the DR7 |
642 | register are reset when the inferior exits. Otherwise, if they | |
643 | rerun the inferior, the uncleared bits may cause random SIGTRAPs, | |
644 | failure to set more watchpoints, and other calamities. It would | |
645 | be nice if GDB itself would take care to remove all breakpoints | |
646 | at all times, but it doesn't, probably under an assumption that | |
647 | the OS cleans up when the debuggee exits. */ | |
648 | cleanup_dregs (); | |
e49d4fa6 SS |
649 | go32_kill_inferior (); |
650 | generic_mourn_inferior (); | |
651 | } | |
652 | ||
653 | static int | |
654 | go32_can_run (void) | |
655 | { | |
656 | return 1; | |
657 | } | |
658 | ||
e49d4fa6 SS |
659 | /* Hardware watchpoint support. */ |
660 | ||
661 | #define DR_STATUS 6 | |
662 | #define DR_CONTROL 7 | |
663 | #define DR_ENABLE_SIZE 2 | |
664 | #define DR_LOCAL_ENABLE_SHIFT 0 | |
665 | #define DR_GLOBAL_ENABLE_SHIFT 1 | |
666 | #define DR_LOCAL_SLOWDOWN 0x100 | |
667 | #define DR_GLOBAL_SLOWDOWN 0x200 | |
668 | #define DR_CONTROL_SHIFT 16 | |
669 | #define DR_CONTROL_SIZE 4 | |
53a5351d | 670 | #define DR_RW_READWRITE 0x3 |
e49d4fa6 SS |
671 | #define DR_RW_WRITE 0x1 |
672 | #define DR_CONTROL_MASK 0xf | |
673 | #define DR_ENABLE_MASK 0x3 | |
674 | #define DR_LEN_1 0x0 | |
675 | #define DR_LEN_2 0x4 | |
676 | #define DR_LEN_4 0xc | |
677 | ||
678 | #define D_REGS edi.dr | |
679 | #define CONTROL D_REGS[DR_CONTROL] | |
680 | #define STATUS D_REGS[DR_STATUS] | |
681 | ||
682 | #define IS_REG_FREE(index) \ | |
53a5351d | 683 | (!(CONTROL & (3 << (DR_ENABLE_SIZE * (index))))) |
e49d4fa6 SS |
684 | |
685 | #define LOCAL_ENABLE_REG(index) \ | |
53a5351d | 686 | (CONTROL |= (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index)))) |
e49d4fa6 SS |
687 | |
688 | #define GLOBAL_ENABLE_REG(index) \ | |
53a5351d | 689 | (CONTROL |= (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index)))) |
e49d4fa6 SS |
690 | |
691 | #define DISABLE_REG(index) \ | |
53a5351d | 692 | (CONTROL &= ~(3 << (DR_ENABLE_SIZE * (index)))) |
e49d4fa6 SS |
693 | |
694 | #define SET_LOCAL_EXACT() \ | |
695 | (CONTROL |= DR_LOCAL_SLOWDOWN) | |
696 | ||
697 | #define SET_GLOBAL_EXACT() \ | |
698 | (CONTROL |= DR_GLOBAL_SLOWDOWN) | |
699 | ||
53a5351d JM |
700 | #define RESET_LOCAL_EXACT() \ |
701 | (CONTROL &= ~(DR_LOCAL_SLOWDOWN)) | |
702 | ||
703 | #define RESET_GLOBAL_EXACT() \ | |
704 | (CONTROL &= ~(DR_GLOBAL_SLOWDOWN)) | |
705 | ||
e49d4fa6 SS |
706 | #define SET_BREAK(index,address) \ |
707 | do {\ | |
53a5351d | 708 | CONTROL &= ~(DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index)));\ |
e49d4fa6 | 709 | D_REGS[index] = address;\ |
c2c6d25f | 710 | dr_ref_count[index]++;\ |
e49d4fa6 SS |
711 | } while(0) |
712 | ||
713 | #define SET_WATCH(index,address,rw,len) \ | |
714 | do {\ | |
715 | SET_BREAK(index,address);\ | |
53a5351d | 716 | CONTROL |= ((len)|(rw)) << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index));\ |
e49d4fa6 SS |
717 | } while (0) |
718 | ||
53a5351d JM |
719 | #define IS_WATCH(index) \ |
720 | (CONTROL & (DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE*(index)))) | |
721 | ||
c2c6d25f | 722 | #define WATCH_HIT(index) ((STATUS & (1 << (index))) && IS_WATCH(index)) |
e49d4fa6 | 723 | |
53a5351d JM |
724 | #define DR_DEF(index) \ |
725 | ((CONTROL >> (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index))) & 0x0f) | |
726 | ||
727 | ||
728 | #if 0 /* use debugging macro */ | |
729 | #define SHOW_DR(text,len) \ | |
e49d4fa6 | 730 | do { \ |
53a5351d | 731 | if (!getenv ("GDB_SHOW_DR")) break; \ |
e49d4fa6 | 732 | fprintf(stderr,"%08x %08x ",edi.dr[7],edi.dr[6]); \ |
53a5351d JM |
733 | fprintf(stderr,"%08x %d %08x %d ", \ |
734 | edi.dr[0],dr_ref_count[0],edi.dr[1],dr_ref_count[1]); \ | |
735 | fprintf(stderr,"%08x %d %08x %d ", \ | |
736 | edi.dr[2],dr_ref_count[2],edi.dr[3],dr_ref_count[3]); \ | |
737 | fprintf(stderr,(len)?"(%s:%d)\n":"(%s)\n",#text,len); \ | |
e49d4fa6 SS |
738 | } while (0) |
739 | #else | |
53a5351d | 740 | #define SHOW_DR(text,len) do {} while (0) |
e49d4fa6 SS |
741 | #endif |
742 | ||
53a5351d JM |
743 | static void |
744 | cleanup_dregs (void) | |
745 | { | |
746 | int i; | |
747 | ||
748 | CONTROL = 0; | |
749 | STATUS = 0; | |
750 | for (i = 0; i < 4; i++) | |
751 | { | |
752 | D_REGS[i] = 0; | |
753 | dr_ref_count[i] = 0; | |
754 | } | |
755 | } | |
756 | ||
e49d4fa6 SS |
757 | /* Insert a watchpoint. */ |
758 | ||
759 | int | |
0fff5247 EZ |
760 | go32_insert_watchpoint (int pid ATTRIBUTE_UNUSED, CORE_ADDR addr, |
761 | int len, int rw) | |
e49d4fa6 | 762 | { |
53a5351d | 763 | int ret = go32_insert_aligned_watchpoint (addr, addr, len, rw); |
e49d4fa6 | 764 | |
53a5351d | 765 | SHOW_DR (insert_watch, len); |
e49d4fa6 SS |
766 | return ret; |
767 | } | |
768 | ||
769 | static int | |
53a5351d | 770 | go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
e49d4fa6 SS |
771 | int len, int rw) |
772 | { | |
773 | int i; | |
774 | int read_write_bits, len_bits; | |
775 | ||
53a5351d JM |
776 | /* Values of rw: 0 - write, 1 - read, 2 - access (read and write). |
777 | However, x86 doesn't support read-only data breakpoints. */ | |
778 | read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE; | |
779 | ||
780 | switch (len) | |
781 | { | |
782 | case 4: | |
783 | len_bits = DR_LEN_4; | |
784 | break; | |
785 | case 2: | |
786 | len_bits = DR_LEN_2; | |
787 | break; | |
788 | case 1: | |
789 | len_bits = DR_LEN_1; | |
790 | break; | |
791 | default: | |
792 | /* The debug registers only have 2 bits for the length, so | |
793 | so this value will always fail the loop below. */ | |
794 | len_bits = 0x10; | |
795 | } | |
796 | ||
797 | /* Look for an occupied debug register with the same address and the | |
798 | same RW and LEN definitions. If we find one, we can use it for | |
799 | this watchpoint as well (and save a register). */ | |
800 | for (i = 0; i < 4; i++) | |
801 | { | |
802 | if (!IS_REG_FREE (i) && D_REGS[i] == addr | |
0fff5247 | 803 | && DR_DEF (i) == (unsigned)(len_bits | read_write_bits)) |
e49d4fa6 | 804 | { |
53a5351d JM |
805 | dr_ref_count[i]++; |
806 | return 0; | |
e49d4fa6 | 807 | } |
53a5351d JM |
808 | } |
809 | ||
810 | /* Look for a free debug register. */ | |
811 | for (i = 0; i <= 3; i++) | |
812 | { | |
813 | if (IS_REG_FREE (i)) | |
814 | break; | |
815 | } | |
e49d4fa6 SS |
816 | |
817 | /* No more debug registers! */ | |
818 | if (i > 3) | |
819 | return -1; | |
820 | ||
53a5351d JM |
821 | if (len == 2) |
822 | { | |
823 | if (addr % 2) | |
824 | return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, | |
825 | len, rw); | |
826 | } | |
e49d4fa6 | 827 | else if (len == 4) |
53a5351d JM |
828 | { |
829 | if (addr % 4) | |
830 | return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, | |
831 | len, rw); | |
832 | } | |
833 | else if (len != 1) | |
834 | return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, len, rw); | |
e49d4fa6 SS |
835 | |
836 | SET_WATCH (i, addr, read_write_bits, len_bits); | |
837 | LOCAL_ENABLE_REG (i); | |
838 | SET_LOCAL_EXACT (); | |
53a5351d JM |
839 | SET_GLOBAL_EXACT (); |
840 | return 0; | |
e49d4fa6 SS |
841 | } |
842 | ||
843 | static int | |
53a5351d | 844 | go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr, CORE_ADDR addr, |
e49d4fa6 SS |
845 | int len, int rw) |
846 | { | |
847 | int align; | |
848 | int size; | |
53a5351d | 849 | int rv = 0, status = 0; |
e49d4fa6 | 850 | |
184a103e | 851 | static int size_try_array[4][4] = |
e49d4fa6 | 852 | { |
184a103e EZ |
853 | { 1, 1, 1, 1 }, /* trying size one */ |
854 | { 2, 1, 2, 1 }, /* trying size two */ | |
855 | { 2, 1, 2, 1 }, /* trying size three */ | |
856 | { 4, 1, 2, 1 } /* trying size four */ | |
e49d4fa6 SS |
857 | }; |
858 | ||
859 | while (len > 0) | |
860 | { | |
861 | align = addr % 4; | |
184a103e EZ |
862 | /* Four is the maximum length a 386 debug register can watch. */ |
863 | size = size_try_array[len > 4 ? 3 : len - 1][align]; | |
53a5351d JM |
864 | if (what == wp_insert) |
865 | status = go32_insert_aligned_watchpoint (waddr, addr, size, rw); | |
866 | else if (what == wp_remove) | |
867 | status = go32_remove_aligned_watchpoint (waddr, addr, size, rw); | |
868 | else if (what == wp_count) | |
869 | rv++; | |
870 | else | |
d03cef9d | 871 | status = EINVAL; |
53a5351d JM |
872 | /* We keep the loop going even after a failure, because some of |
873 | the other aligned watchpoints might still succeed, e.g. if | |
874 | they watch addresses that are already watched, and thus just | |
875 | increment the reference counts of occupied debug registers. | |
876 | If we break out of the loop too early, we could cause those | |
877 | addresses watched by other watchpoints to be disabled when | |
878 | GDB reacts to our failure to insert this watchpoint and tries | |
879 | to remove it. */ | |
880 | if (status) | |
881 | rv = status; | |
e49d4fa6 SS |
882 | addr += size; |
883 | len -= size; | |
884 | } | |
885 | return rv; | |
886 | } | |
887 | ||
888 | /* Remove a watchpoint. */ | |
889 | ||
890 | int | |
0fff5247 EZ |
891 | go32_remove_watchpoint (int pid ATTRIBUTE_UNUSED, CORE_ADDR addr, |
892 | int len, int rw) | |
53a5351d JM |
893 | { |
894 | int ret = go32_remove_aligned_watchpoint (addr, addr, len, rw); | |
895 | ||
896 | SHOW_DR (remove_watch, len); | |
897 | return ret; | |
898 | } | |
899 | ||
900 | static int | |
901 | go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, | |
902 | int len, int rw) | |
e49d4fa6 SS |
903 | { |
904 | int i; | |
53a5351d JM |
905 | int read_write_bits, len_bits; |
906 | ||
907 | /* Values of rw: 0 - write, 1 - read, 2 - access (read and write). | |
908 | However, x86 doesn't support read-only data breakpoints. */ | |
909 | read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE; | |
910 | ||
911 | switch (len) | |
912 | { | |
913 | case 4: | |
914 | len_bits = DR_LEN_4; | |
915 | break; | |
916 | case 2: | |
917 | len_bits = DR_LEN_2; | |
918 | break; | |
919 | case 1: | |
920 | len_bits = DR_LEN_1; | |
921 | break; | |
922 | default: | |
923 | /* The debug registers only have 2 bits for the length, so | |
924 | so this value will always fail the loop below. */ | |
925 | len_bits = 0x10; | |
926 | } | |
927 | ||
928 | if (len == 2) | |
929 | { | |
930 | if (addr % 2) | |
931 | return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, | |
932 | len, rw); | |
933 | } | |
934 | else if (len == 4) | |
935 | { | |
936 | if (addr % 4) | |
937 | return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, | |
938 | len, rw); | |
939 | } | |
940 | else if (len != 1) | |
941 | return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, len, rw); | |
e49d4fa6 SS |
942 | |
943 | for (i = 0; i <= 3; i++) | |
944 | { | |
53a5351d | 945 | if (!IS_REG_FREE (i) && D_REGS[i] == addr |
0fff5247 | 946 | && DR_DEF (i) == (unsigned)(len_bits | read_write_bits)) |
e49d4fa6 | 947 | { |
53a5351d JM |
948 | dr_ref_count[i]--; |
949 | if (dr_ref_count[i] == 0) | |
950 | DISABLE_REG (i); | |
e49d4fa6 SS |
951 | } |
952 | } | |
53a5351d JM |
953 | RESET_LOCAL_EXACT (); |
954 | RESET_GLOBAL_EXACT (); | |
e49d4fa6 SS |
955 | |
956 | return 0; | |
957 | } | |
958 | ||
53a5351d JM |
959 | /* Can we use debug registers to watch a region whose address is ADDR |
960 | and whose length is LEN bytes? */ | |
961 | ||
962 | int | |
963 | go32_region_ok_for_watchpoint (CORE_ADDR addr, int len) | |
964 | { | |
965 | /* Compute how many aligned watchpoints we would need to cover this | |
966 | region. */ | |
967 | int nregs = go32_handle_nonaligned_watchpoint (wp_count, addr, addr, len, 0); | |
968 | ||
969 | return nregs <= 4 ? 1 : 0; | |
970 | } | |
971 | ||
972 | /* Check if stopped by a data watchpoint. If so, return the address | |
973 | whose access triggered the watchpoint. */ | |
e49d4fa6 SS |
974 | |
975 | CORE_ADDR | |
0fff5247 | 976 | go32_stopped_by_watchpoint (int pid ATTRIBUTE_UNUSED, int data_watchpoint) |
e49d4fa6 SS |
977 | { |
978 | int i, ret = 0; | |
979 | int status; | |
980 | ||
981 | status = edi.dr[DR_STATUS]; | |
53a5351d | 982 | SHOW_DR (stopped_by, 0); |
e49d4fa6 SS |
983 | for (i = 0; i <= 3; i++) |
984 | { | |
53a5351d | 985 | if (WATCH_HIT (i) && data_watchpoint) |
e49d4fa6 | 986 | { |
53a5351d | 987 | SHOW_DR (WP_HIT, 0); |
e49d4fa6 SS |
988 | ret = D_REGS[i]; |
989 | } | |
990 | } | |
e49d4fa6 SS |
991 | |
992 | return ret; | |
993 | } | |
994 | ||
995 | /* Remove a breakpoint. */ | |
996 | ||
997 | int | |
0fff5247 | 998 | go32_remove_hw_breakpoint (CORE_ADDR addr, void *shadow ATTRIBUTE_UNUSED) |
e49d4fa6 SS |
999 | { |
1000 | int i; | |
1001 | for (i = 0; i <= 3; i++) | |
1002 | { | |
53a5351d | 1003 | if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0) |
e49d4fa6 | 1004 | { |
53a5351d JM |
1005 | dr_ref_count[i]--; |
1006 | if (dr_ref_count[i] == 0) | |
1007 | DISABLE_REG (i); | |
e49d4fa6 SS |
1008 | } |
1009 | } | |
53a5351d | 1010 | SHOW_DR (remove_hw, 0); |
e49d4fa6 SS |
1011 | return 0; |
1012 | } | |
1013 | ||
1014 | int | |
0fff5247 | 1015 | go32_insert_hw_breakpoint (CORE_ADDR addr, void *shadow ATTRIBUTE_UNUSED) |
e49d4fa6 SS |
1016 | { |
1017 | int i; | |
e49d4fa6 | 1018 | |
53a5351d JM |
1019 | /* Look for an occupied debug register with the same address and the |
1020 | same RW and LEN definitions. If we find one, we can use it for | |
1021 | this breakpoint as well (and save a register). */ | |
1022 | for (i = 0; i < 4; i++) | |
1023 | { | |
1024 | if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0) | |
1025 | { | |
1026 | dr_ref_count[i]++; | |
1027 | SHOW_DR (insert_hw, 0); | |
1028 | return 0; | |
1029 | } | |
1030 | } | |
1031 | ||
e49d4fa6 SS |
1032 | /* Look for a free debug register. */ |
1033 | for (i = 0; i <= 3; i++) | |
1034 | { | |
1035 | if (IS_REG_FREE (i)) | |
1036 | break; | |
1037 | } | |
1038 | ||
53a5351d JM |
1039 | /* No more debug registers? */ |
1040 | if (i < 4) | |
1041 | { | |
1042 | SET_BREAK (i, addr); | |
1043 | LOCAL_ENABLE_REG (i); | |
1044 | } | |
1045 | SHOW_DR (insert_hw, 0); | |
e49d4fa6 | 1046 | |
d03cef9d | 1047 | return i < 4 ? 0 : EBUSY; |
e49d4fa6 SS |
1048 | } |
1049 | ||
53a5351d JM |
1050 | /* Put the device open on handle FD into either raw or cooked |
1051 | mode, return 1 if it was in raw mode, zero otherwise. */ | |
1052 | ||
1053 | static int | |
1054 | device_mode (int fd, int raw_p) | |
1055 | { | |
1056 | int oldmode, newmode; | |
1057 | __dpmi_regs regs; | |
1058 | ||
1059 | regs.x.ax = 0x4400; | |
1060 | regs.x.bx = fd; | |
1061 | __dpmi_int (0x21, ®s); | |
1062 | if (regs.x.flags & 1) | |
1063 | return -1; | |
1064 | newmode = oldmode = regs.x.dx; | |
1065 | ||
1066 | if (raw_p) | |
1067 | newmode |= 0x20; | |
1068 | else | |
1069 | newmode &= ~0x20; | |
1070 | ||
1071 | if (oldmode & 0x80) /* Only for character dev */ | |
1072 | { | |
1073 | regs.x.ax = 0x4401; | |
1074 | regs.x.bx = fd; | |
1075 | regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails */ | |
1076 | __dpmi_int (0x21, ®s); | |
1077 | if (regs.x.flags & 1) | |
1078 | return -1; | |
1079 | } | |
1080 | return (oldmode & 0x20) == 0x20; | |
1081 | } | |
1082 | ||
1083 | ||
1084 | static int inf_mode_valid = 0; | |
1085 | static int inf_terminal_mode; | |
1086 | ||
1087 | /* This semaphore is needed because, amazingly enough, GDB calls | |
1088 | target.to_terminal_ours more than once after the inferior stops. | |
1089 | But we need the information from the first call only, since the | |
1090 | second call will always see GDB's own cooked terminal. */ | |
1091 | static int terminal_is_ours = 1; | |
1092 | ||
cce74817 JM |
1093 | static void |
1094 | go32_terminal_init (void) | |
1095 | { | |
53a5351d JM |
1096 | inf_mode_valid = 0; /* reinitialize, in case they are restarting child */ |
1097 | terminal_is_ours = 1; | |
cce74817 JM |
1098 | } |
1099 | ||
1100 | static void | |
0fff5247 | 1101 | go32_terminal_info (char *args ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED) |
cce74817 | 1102 | { |
53a5351d JM |
1103 | printf_unfiltered ("Inferior's terminal is in %s mode.\n", |
1104 | !inf_mode_valid | |
1105 | ? "default" : inf_terminal_mode ? "raw" : "cooked"); | |
1106 | ||
1107 | #if __DJGPP_MINOR__ > 2 | |
1108 | if (child_cmd.redirection) | |
1109 | { | |
1110 | int i; | |
1111 | ||
1112 | for (i = 0; i < DBG_HANDLES; i++) | |
c5aa993b | 1113 | { |
53a5351d JM |
1114 | if (child_cmd.redirection[i]->file_name) |
1115 | printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n", | |
1116 | i, child_cmd.redirection[i]->file_name); | |
1117 | else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1) | |
1118 | printf_unfiltered | |
1119 | ("\tFile handle %d appears to be closed by inferior.\n", i); | |
1120 | /* Mask off the raw/cooked bit when comparing device info words. */ | |
1121 | else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf) | |
1122 | != (_get_dev_info (i) & 0xdf)) | |
1123 | printf_unfiltered | |
1124 | ("\tFile handle %d appears to be redirected by inferior.\n", i); | |
c5aa993b | 1125 | } |
53a5351d JM |
1126 | } |
1127 | #endif | |
1128 | } | |
1129 | ||
1130 | static void | |
1131 | go32_terminal_inferior (void) | |
1132 | { | |
1133 | /* Redirect standard handles as child wants them. */ | |
1134 | errno = 0; | |
1135 | if (redir_to_child (&child_cmd) == -1) | |
1136 | { | |
1137 | redir_to_debugger (&child_cmd); | |
1138 | error ("Cannot redirect standard handles for program: %s.", | |
1139 | strerror (errno)); | |
1140 | } | |
1141 | /* set the console device of the inferior to whatever mode | |
1142 | (raw or cooked) we found it last time */ | |
1143 | if (terminal_is_ours) | |
1144 | { | |
1145 | if (inf_mode_valid) | |
1146 | device_mode (0, inf_terminal_mode); | |
1147 | terminal_is_ours = 0; | |
1148 | } | |
cce74817 JM |
1149 | } |
1150 | ||
1151 | static void | |
1152 | go32_terminal_ours (void) | |
1153 | { | |
53a5351d JM |
1154 | /* Switch to cooked mode on the gdb terminal and save the inferior |
1155 | terminal mode to be restored when it is resumed */ | |
1156 | if (!terminal_is_ours) | |
1157 | { | |
1158 | inf_terminal_mode = device_mode (0, 0); | |
1159 | if (inf_terminal_mode != -1) | |
1160 | inf_mode_valid = 1; | |
1161 | else | |
1162 | /* If device_mode returned -1, we don't know what happens with | |
1163 | handle 0 anymore, so make the info invalid. */ | |
1164 | inf_mode_valid = 0; | |
1165 | terminal_is_ours = 1; | |
1166 | ||
1167 | /* Restore debugger's standard handles. */ | |
1168 | errno = 0; | |
1169 | if (redir_to_debugger (&child_cmd) == -1) | |
1170 | { | |
1171 | redir_to_child (&child_cmd); | |
1172 | error ("Cannot redirect standard handles for debugger: %s.", | |
1173 | strerror (errno)); | |
1174 | } | |
1175 | } | |
cce74817 JM |
1176 | } |
1177 | ||
e49d4fa6 SS |
1178 | static void |
1179 | init_go32_ops (void) | |
1180 | { | |
1181 | go32_ops.to_shortname = "djgpp"; | |
1182 | go32_ops.to_longname = "djgpp target process"; | |
1183 | go32_ops.to_doc = | |
1184 | "Program loaded by djgpp, when gdb is used as an external debugger"; | |
1185 | go32_ops.to_open = go32_open; | |
1186 | go32_ops.to_close = go32_close; | |
53a5351d | 1187 | go32_ops.to_attach = go32_attach; |
e49d4fa6 SS |
1188 | go32_ops.to_detach = go32_detach; |
1189 | go32_ops.to_resume = go32_resume; | |
1190 | go32_ops.to_wait = go32_wait; | |
1191 | go32_ops.to_fetch_registers = go32_fetch_registers; | |
1192 | go32_ops.to_store_registers = go32_store_registers; | |
1193 | go32_ops.to_prepare_to_store = go32_prepare_to_store; | |
1194 | go32_ops.to_xfer_memory = go32_xfer_memory; | |
1195 | go32_ops.to_files_info = go32_files_info; | |
1196 | go32_ops.to_insert_breakpoint = memory_insert_breakpoint; | |
1197 | go32_ops.to_remove_breakpoint = memory_remove_breakpoint; | |
cce74817 JM |
1198 | go32_ops.to_terminal_init = go32_terminal_init; |
1199 | go32_ops.to_terminal_inferior = go32_terminal_inferior; | |
53a5351d | 1200 | go32_ops.to_terminal_ours_for_output = go32_terminal_ours; |
cce74817 | 1201 | go32_ops.to_terminal_ours = go32_terminal_ours; |
53a5351d | 1202 | go32_ops.to_terminal_info = go32_terminal_info; |
e49d4fa6 SS |
1203 | go32_ops.to_kill = go32_kill_inferior; |
1204 | go32_ops.to_create_inferior = go32_create_inferior; | |
1205 | go32_ops.to_mourn_inferior = go32_mourn_inferior; | |
1206 | go32_ops.to_can_run = go32_can_run; | |
1207 | go32_ops.to_stop = go32_stop; | |
1208 | go32_ops.to_stratum = process_stratum; | |
1209 | go32_ops.to_has_all_memory = 1; | |
1210 | go32_ops.to_has_memory = 1; | |
1211 | go32_ops.to_has_stack = 1; | |
1212 | go32_ops.to_has_registers = 1; | |
1213 | go32_ops.to_has_execution = 1; | |
1214 | go32_ops.to_magic = OPS_MAGIC; | |
53a5351d | 1215 | |
3a45aed8 EZ |
1216 | /* Initialize child's cwd as empty to be initialized when starting |
1217 | the child. */ | |
1218 | *child_cwd = 0; | |
53a5351d JM |
1219 | |
1220 | /* Initialize child's command line storage. */ | |
1221 | if (redir_debug_init (&child_cmd) == -1) | |
8e65ff28 AC |
1222 | internal_error (__FILE__, __LINE__, |
1223 | "Cannot allocate redirection storage: not enough memory.\n"); | |
0fff5247 EZ |
1224 | |
1225 | /* We are always processing GCC-compiled programs. */ | |
1226 | processing_gcc_compilation = 2; | |
e49d4fa6 SS |
1227 | } |
1228 | ||
1229 | void | |
1230 | _initialize_go32_nat (void) | |
1231 | { | |
1232 | init_go32_ops (); | |
1233 | add_target (&go32_ops); | |
1234 | } | |
53a5351d JM |
1235 | |
1236 | pid_t | |
1237 | tcgetpgrp (int fd) | |
1238 | { | |
1239 | if (isatty (fd)) | |
1240 | return SOME_PID; | |
1241 | errno = ENOTTY; | |
1242 | return -1; | |
1243 | } | |
1244 | ||
1245 | int | |
1246 | tcsetpgrp (int fd, pid_t pgid) | |
1247 | { | |
1248 | if (isatty (fd) && pgid == SOME_PID) | |
1249 | return 0; | |
1250 | errno = pgid == SOME_PID ? ENOTTY : ENOSYS; | |
1251 | return -1; | |
1252 | } |