Commit | Line | Data |
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e49d4fa6 SS |
1 | /* Native debugging support for Intel x86 running DJGPP. |
2 | Copyright 1997, 1999 Free Software Foundation, Inc. | |
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" | |
25 | #include "frame.h" /* required by inferior.h */ | |
26 | #include "inferior.h" | |
27 | #include "target.h" | |
28 | #include "wait.h" | |
29 | #include "gdbcore.h" | |
30 | #include "command.h" | |
31 | #include "floatformat.h" | |
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 | ||
140 | struct env387 | |
c5aa993b JM |
141 | { |
142 | unsigned short control; | |
143 | unsigned short r0; | |
144 | unsigned short status; | |
145 | unsigned short r1; | |
146 | unsigned short tag; | |
147 | unsigned short r2; | |
148 | unsigned long eip; | |
149 | unsigned short code_seg; | |
150 | unsigned short opcode; | |
151 | unsigned long operand; | |
152 | unsigned short operand_seg; | |
153 | unsigned short r3; | |
154 | unsigned char regs[8][10]; | |
155 | }; | |
e49d4fa6 | 156 | |
53a5351d JM |
157 | typedef enum { wp_insert, wp_remove, wp_count } wp_op; |
158 | ||
159 | /* This holds the current reference counts for each debug register. */ | |
160 | static int dr_ref_count[4]; | |
161 | ||
e49d4fa6 SS |
162 | extern char **environ; |
163 | ||
164 | #define SOME_PID 42 | |
165 | ||
e49d4fa6 | 166 | static int prog_has_started = 0; |
c5aa993b JM |
167 | static void print_387_status (unsigned short status, struct env387 *ep); |
168 | static void go32_open (char *name, int from_tty); | |
169 | static void go32_close (int quitting); | |
170 | static void go32_attach (char *args, int from_tty); | |
171 | static void go32_detach (char *args, int from_tty); | |
172 | static void go32_resume (int pid, int step, enum target_signal siggnal); | |
173 | static int go32_wait (int pid, struct target_waitstatus *status); | |
174 | static void go32_fetch_registers (int regno); | |
175 | static void store_register (int regno); | |
176 | static void go32_store_registers (int regno); | |
177 | static void go32_prepare_to_store (void); | |
178 | static int go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, | |
179 | int write, struct target_ops *target); | |
180 | static void go32_files_info (struct target_ops *target); | |
181 | static void go32_stop (void); | |
182 | static void go32_kill_inferior (void); | |
183 | static void go32_create_inferior (char *exec_file, char *args, char **env); | |
53a5351d | 184 | static void cleanup_dregs (void); |
c5aa993b JM |
185 | static void go32_mourn_inferior (void); |
186 | static int go32_can_run (void); | |
187 | static void ignore (void); | |
188 | static void ignore2 (char *a, int b); | |
53a5351d JM |
189 | static int go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
190 | int len, int rw); | |
191 | static int go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, | |
192 | int len, int rw); | |
193 | static int go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr, | |
194 | CORE_ADDR addr, int len, int rw); | |
b83266a0 SS |
195 | |
196 | static struct target_ops go32_ops; | |
c5aa993b JM |
197 | static void go32_terminal_init (void); |
198 | static void go32_terminal_inferior (void); | |
199 | static void go32_terminal_ours (void); | |
e49d4fa6 SS |
200 | |
201 | static void | |
202 | print_387_status (unsigned short status, struct env387 *ep) | |
203 | { | |
204 | int i; | |
205 | int bothstatus; | |
206 | int top; | |
207 | int fpreg; | |
208 | ||
209 | bothstatus = ((status != 0) && (ep->status != 0)); | |
210 | if (status != 0) | |
211 | { | |
212 | if (bothstatus) | |
213 | printf_unfiltered ("u: "); | |
214 | print_387_status_word (status); | |
215 | } | |
216 | ||
217 | if (ep->status != 0) | |
218 | { | |
219 | if (bothstatus) | |
220 | printf_unfiltered ("e: "); | |
221 | print_387_status_word (ep->status); | |
222 | } | |
223 | ||
224 | print_387_control_word (ep->control & 0xffff); | |
53a5351d JM |
225 | /* Other platforms say "last exception", but that's not true: the |
226 | FPU stores the last non-control instruction there. */ | |
227 | printf_unfiltered ("last FP instruction: "); | |
228 | /* The ORing with D800h restores the upper 5 bits of the opcode that | |
229 | are not stored by the FPU (since these bits are the same for all | |
230 | floating-point instructions). */ | |
231 | printf_unfiltered ("opcode %s; ", | |
232 | local_hex_string (ep->opcode ? (ep->opcode|0xd800) : 0)); | |
e49d4fa6 SS |
233 | printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg)); |
234 | printf_unfiltered ("%s; ", local_hex_string (ep->eip)); | |
235 | printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg)); | |
236 | printf_unfiltered (":%s\n", local_hex_string (ep->operand)); | |
237 | ||
238 | top = (ep->status >> 11) & 7; | |
239 | ||
53a5351d JM |
240 | printf_unfiltered ("regno tag msb lsb value\n"); |
241 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
e49d4fa6 | 242 | { |
53a5351d JM |
243 | /* FNSAVE saves the FP registers in their logical TOP-relative |
244 | order, beginning with ST(0). Since we need to print them in | |
245 | their physical order, we have to remap them. */ | |
246 | int regno = fpreg - top; | |
e49d4fa6 SS |
247 | long double val; |
248 | ||
53a5351d JM |
249 | if (regno < 0) |
250 | regno += 8; | |
251 | ||
e49d4fa6 SS |
252 | printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg); |
253 | ||
254 | switch ((ep->tag >> (fpreg * 2)) & 3) | |
255 | { | |
256 | case 0: | |
53a5351d | 257 | printf_unfiltered ("valid "); |
e49d4fa6 SS |
258 | break; |
259 | case 1: | |
53a5351d | 260 | printf_unfiltered ("zero "); |
e49d4fa6 SS |
261 | break; |
262 | case 2: | |
53a5351d JM |
263 | /* All other versions of print_387_status use TRAP here, but I |
264 | think this is misleading, since Intel manuals say SPECIAL. */ | |
265 | printf_unfiltered ("special "); | |
e49d4fa6 SS |
266 | break; |
267 | case 3: | |
53a5351d | 268 | printf_unfiltered ("empty "); |
e49d4fa6 SS |
269 | break; |
270 | } | |
53a5351d JM |
271 | for (i = 9; i >= 0; i--) |
272 | printf_unfiltered ("%02x", ep->regs[regno][i]); | |
e49d4fa6 | 273 | |
53a5351d JM |
274 | REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM+regno, builtin_type_long_double, |
275 | &ep->regs[regno], &val); | |
e49d4fa6 | 276 | |
53a5351d | 277 | printf_unfiltered (" %.19LG\n", val); |
e49d4fa6 SS |
278 | } |
279 | } | |
280 | ||
281 | void | |
282 | i386_go32_float_info (void) | |
283 | { | |
284 | print_387_status (0, (struct env387 *) &npx); | |
285 | } | |
286 | ||
53a5351d | 287 | #define r_ofs(x) (offsetof(TSS,x)) |
e49d4fa6 SS |
288 | |
289 | static struct | |
290 | { | |
53a5351d JM |
291 | size_t tss_ofs; |
292 | size_t size; | |
e49d4fa6 SS |
293 | } |
294 | regno_mapping[] = | |
295 | { | |
53a5351d | 296 | r_ofs (tss_eax), 4, /* normal registers, from a_tss */ |
c5aa993b JM |
297 | r_ofs (tss_ecx), 4, |
298 | r_ofs (tss_edx), 4, | |
299 | r_ofs (tss_ebx), 4, | |
300 | r_ofs (tss_esp), 4, | |
301 | r_ofs (tss_ebp), 4, | |
302 | r_ofs (tss_esi), 4, | |
303 | r_ofs (tss_edi), 4, | |
304 | r_ofs (tss_eip), 4, | |
305 | r_ofs (tss_eflags), 4, | |
306 | r_ofs (tss_cs), 2, | |
307 | r_ofs (tss_ss), 2, | |
308 | r_ofs (tss_ds), 2, | |
309 | r_ofs (tss_es), 2, | |
310 | r_ofs (tss_fs), 2, | |
311 | r_ofs (tss_gs), 2, | |
53a5351d | 312 | 0, 10, /* 8 FP registers, from npx.reg[] */ |
c5aa993b JM |
313 | 1, 10, |
314 | 2, 10, | |
315 | 3, 10, | |
316 | 4, 10, | |
317 | 5, 10, | |
318 | 6, 10, | |
319 | 7, 10, | |
53a5351d JM |
320 | /* The order of the next 7 registers must be consistent |
321 | with their numbering in config/i386/tm-go32.h, which see. */ | |
322 | 0, 2, /* control word, from npx */ | |
323 | 4, 2, /* status word, from npx */ | |
324 | 8, 2, /* tag word, from npx */ | |
325 | 16, 2, /* last FP exception CS from npx */ | |
326 | 24, 2, /* last FP exception operand selector from npx */ | |
327 | 12, 4, /* last FP exception EIP from npx */ | |
328 | 20, 4 /* last FP exception operand offset from npx */ | |
e49d4fa6 SS |
329 | }; |
330 | ||
331 | static struct | |
332 | { | |
333 | int go32_sig; | |
334 | int gdb_sig; | |
335 | } | |
336 | sig_map[] = | |
337 | { | |
338 | 0, TARGET_SIGNAL_FPE, | |
c5aa993b | 339 | 1, TARGET_SIGNAL_TRAP, |
53a5351d JM |
340 | /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL, |
341 | but I think SIGBUS is better, since the NMI is usually activated | |
342 | as a result of a memory parity check failure. */ | |
343 | 2, TARGET_SIGNAL_BUS, | |
c5aa993b JM |
344 | 3, TARGET_SIGNAL_TRAP, |
345 | 4, TARGET_SIGNAL_FPE, | |
346 | 5, TARGET_SIGNAL_SEGV, | |
347 | 6, TARGET_SIGNAL_ILL, | |
4ce44c66 | 348 | 7, TARGET_SIGNAL_EMT, /* no-coprocessor exception */ |
c5aa993b JM |
349 | 8, TARGET_SIGNAL_SEGV, |
350 | 9, TARGET_SIGNAL_SEGV, | |
351 | 10, TARGET_SIGNAL_BUS, | |
352 | 11, TARGET_SIGNAL_SEGV, | |
353 | 12, TARGET_SIGNAL_SEGV, | |
53a5351d | 354 | 13, TARGET_SIGNAL_SEGV, |
c5aa993b JM |
355 | 14, TARGET_SIGNAL_SEGV, |
356 | 16, TARGET_SIGNAL_FPE, | |
53a5351d | 357 | 17, TARGET_SIGNAL_BUS, |
c5aa993b | 358 | 31, TARGET_SIGNAL_ILL, |
53a5351d | 359 | 0x1b, TARGET_SIGNAL_INT, |
c5aa993b | 360 | 0x75, TARGET_SIGNAL_FPE, |
53a5351d | 361 | 0x78, TARGET_SIGNAL_ALRM, |
c5aa993b | 362 | 0x79, TARGET_SIGNAL_INT, |
53a5351d | 363 | 0x7a, TARGET_SIGNAL_QUIT, |
c5aa993b | 364 | -1, -1 |
e49d4fa6 SS |
365 | }; |
366 | ||
53a5351d JM |
367 | static struct { |
368 | enum target_signal gdb_sig; | |
369 | int djgpp_excepno; | |
370 | } excepn_map[] = { | |
371 | TARGET_SIGNAL_0, -1, | |
372 | TARGET_SIGNAL_ILL, 6, /* Invalid Opcode */ | |
373 | TARGET_SIGNAL_EMT, 7, /* triggers SIGNOFP */ | |
374 | TARGET_SIGNAL_SEGV, 13, /* GPF */ | |
375 | TARGET_SIGNAL_BUS, 17, /* Alignment Check */ | |
376 | /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for | |
377 | details. */ | |
378 | TARGET_SIGNAL_TERM, 0x1b, /* triggers Ctrl-Break type of SIGINT */ | |
379 | TARGET_SIGNAL_FPE, 0x75, | |
380 | TARGET_SIGNAL_INT, 0x79, | |
381 | TARGET_SIGNAL_QUIT, 0x7a, | |
382 | TARGET_SIGNAL_ALRM, 0x78, /* triggers SIGTIMR */ | |
383 | TARGET_SIGNAL_PROF, 0x78, | |
384 | -1, -1 | |
385 | }; | |
386 | ||
e49d4fa6 SS |
387 | static void |
388 | go32_open (char *name, int from_tty) | |
389 | { | |
53a5351d | 390 | printf_unfiltered ("Done. Use the \"run\" command to run the program.\n"); |
e49d4fa6 SS |
391 | } |
392 | ||
393 | static void | |
394 | go32_close (int quitting) | |
395 | { | |
396 | } | |
397 | ||
398 | static void | |
399 | go32_attach (char *args, int from_tty) | |
400 | { | |
53a5351d JM |
401 | error ("\ |
402 | You cannot attach to a running program on this platform.\n\ | |
403 | Use the `run' command to run DJGPP programs."); | |
e49d4fa6 SS |
404 | } |
405 | ||
406 | static void | |
407 | go32_detach (char *args, int from_tty) | |
408 | { | |
409 | } | |
410 | ||
411 | static int resume_is_step; | |
53a5351d | 412 | static int resume_signal = -1; |
e49d4fa6 SS |
413 | |
414 | static void | |
415 | go32_resume (int pid, int step, enum target_signal siggnal) | |
c5aa993b | 416 | { |
53a5351d JM |
417 | int i; |
418 | ||
c5aa993b | 419 | resume_is_step = step; |
53a5351d JM |
420 | |
421 | if (siggnal != TARGET_SIGNAL_0 && siggnal != TARGET_SIGNAL_TRAP) | |
422 | { | |
423 | for (i = 0, resume_signal = -1; excepn_map[i].gdb_sig != -1; i++) | |
424 | if (excepn_map[i].gdb_sig == siggnal) | |
425 | { | |
426 | resume_signal = excepn_map[i].djgpp_excepno; | |
427 | break; | |
428 | } | |
429 | if (resume_signal == -1) | |
430 | printf_unfiltered ("Cannot deliver signal %s on this platform.\n", | |
431 | target_signal_to_name (siggnal)); | |
432 | } | |
c5aa993b | 433 | } |
e49d4fa6 | 434 | |
53a5351d JM |
435 | static char child_cwd[FILENAME_MAX]; |
436 | ||
e49d4fa6 SS |
437 | static int |
438 | go32_wait (int pid, struct target_waitstatus *status) | |
439 | { | |
440 | int i; | |
53a5351d JM |
441 | unsigned char saved_opcode; |
442 | unsigned long INT3_addr; | |
443 | int stepping_over_INT = 0; | |
e49d4fa6 | 444 | |
53a5351d | 445 | a_tss.tss_eflags &= 0xfeff; /* reset the single-step flag (TF) */ |
e49d4fa6 | 446 | if (resume_is_step) |
53a5351d JM |
447 | { |
448 | /* If the next instruction is INT xx or INTO, we need to handle | |
449 | them specially. Intel manuals say that these instructions | |
450 | reset the single-step flag (a.k.a. TF). However, it seems | |
451 | that, at least in the DPMI environment, and at least when | |
452 | stepping over the DPMI interrupt 31h, the problem is having | |
453 | TF set at all when INT 31h is executed: the debuggee either | |
454 | crashes (and takes the system with it) or is killed by a | |
455 | SIGTRAP. | |
456 | ||
457 | So we need to emulate single-step mode: we put an INT3 opcode | |
458 | right after the INT xx instruction, let the debuggee run | |
459 | until it hits INT3 and stops, then restore the original | |
460 | instruction which we overwrote with the INT3 opcode, and back | |
461 | up the debuggee's EIP to that instruction. */ | |
462 | read_child (a_tss.tss_eip, &saved_opcode, 1); | |
463 | if (saved_opcode == 0xCD || saved_opcode == 0xCE) | |
464 | { | |
465 | unsigned char INT3_opcode = 0xCC; | |
466 | ||
467 | INT3_addr | |
468 | = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1; | |
469 | stepping_over_INT = 1; | |
470 | read_child (INT3_addr, &saved_opcode, 1); | |
471 | write_child (INT3_addr, &INT3_opcode, 1); | |
472 | } | |
473 | else | |
474 | a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */ | |
475 | } | |
476 | ||
477 | /* The special value FFFFh in tss_trap indicates to run_child that | |
478 | tss_irqn holds a signal to be delivered to the debuggee. */ | |
479 | if (resume_signal <= -1) | |
480 | { | |
481 | a_tss.tss_trap = 0; | |
482 | a_tss.tss_irqn = 0xff; | |
483 | } | |
e49d4fa6 | 484 | else |
53a5351d JM |
485 | { |
486 | a_tss.tss_trap = 0xffff; /* run_child looks for this */ | |
487 | a_tss.tss_irqn = resume_signal; | |
488 | } | |
489 | ||
490 | /* The child might change working directory behind our back. The | |
491 | GDB users won't like the side effects of that when they work with | |
492 | relative file names, and GDB might be confused by its current | |
493 | directory not being in sync with the truth. So we always make a | |
494 | point of changing back to where GDB thinks is its cwd, when we | |
495 | return control to the debugger, but restore child's cwd before we | |
496 | run it. */ | |
497 | chdir (child_cwd); | |
e49d4fa6 | 498 | |
b83266a0 | 499 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 500 | load_npx (); |
b83266a0 | 501 | #endif |
e49d4fa6 | 502 | run_child (); |
b83266a0 | 503 | #if __DJGPP_MINOR__ < 3 |
53a5351d | 504 | save_npx (); |
b83266a0 | 505 | #endif |
e49d4fa6 | 506 | |
53a5351d JM |
507 | /* Did we step over an INT xx instruction? */ |
508 | if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1) | |
509 | { | |
510 | /* Restore the original opcode. */ | |
511 | a_tss.tss_eip--; /* EIP points *after* the INT3 instruction */ | |
512 | write_child (a_tss.tss_eip, &saved_opcode, 1); | |
513 | /* Simulate a TRAP exception. */ | |
514 | a_tss.tss_irqn = 1; | |
515 | a_tss.tss_eflags |= 0x0100; | |
516 | } | |
517 | ||
518 | getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */ | |
519 | chdir (current_directory); | |
520 | ||
e49d4fa6 SS |
521 | if (a_tss.tss_irqn == 0x21) |
522 | { | |
523 | status->kind = TARGET_WAITKIND_EXITED; | |
524 | status->value.integer = a_tss.tss_eax & 0xff; | |
525 | } | |
526 | else | |
527 | { | |
528 | status->value.sig = TARGET_SIGNAL_UNKNOWN; | |
529 | status->kind = TARGET_WAITKIND_STOPPED; | |
530 | for (i = 0; sig_map[i].go32_sig != -1; i++) | |
531 | { | |
532 | if (a_tss.tss_irqn == sig_map[i].go32_sig) | |
533 | { | |
53a5351d | 534 | #if __DJGPP_MINOR__ < 3 |
e49d4fa6 SS |
535 | if ((status->value.sig = sig_map[i].gdb_sig) != |
536 | TARGET_SIGNAL_TRAP) | |
537 | status->kind = TARGET_WAITKIND_SIGNALLED; | |
53a5351d JM |
538 | #else |
539 | status->value.sig = sig_map[i].gdb_sig; | |
540 | #endif | |
e49d4fa6 SS |
541 | break; |
542 | } | |
543 | } | |
544 | } | |
545 | return SOME_PID; | |
546 | } | |
547 | ||
548 | static void | |
549 | go32_fetch_registers (int regno) | |
550 | { | |
c5aa993b | 551 | /*JHW */ |
e49d4fa6 SS |
552 | int end_reg = regno + 1; /* just one reg initially */ |
553 | ||
554 | if (regno < 0) /* do the all registers */ | |
555 | { | |
556 | regno = 0; /* start at first register */ | |
557 | /* # regs in table */ | |
558 | end_reg = sizeof (regno_mapping) / sizeof (regno_mapping[0]); | |
559 | } | |
560 | ||
561 | for (; regno < end_reg; regno++) | |
562 | { | |
563 | if (regno < 16) | |
564 | supply_register (regno, | |
565 | (char *) &a_tss + regno_mapping[regno].tss_ofs); | |
566 | else if (regno < 24) | |
567 | supply_register (regno, | |
568 | (char *) &npx.reg[regno_mapping[regno].tss_ofs]); | |
569 | else if (regno < 31) | |
570 | supply_register (regno, | |
53a5351d | 571 | (char *) &npx + regno_mapping[regno].tss_ofs); |
e49d4fa6 | 572 | else |
4ce44c66 JM |
573 | internal_error ("Invalid register no. %d in go32_fetch_register.", |
574 | regno); | |
e49d4fa6 SS |
575 | } |
576 | } | |
577 | ||
578 | static void | |
579 | store_register (int regno) | |
580 | { | |
581 | void *rp; | |
582 | void *v = (void *) ®isters[REGISTER_BYTE (regno)]; | |
583 | ||
584 | if (regno < 16) | |
585 | rp = (char *) &a_tss + regno_mapping[regno].tss_ofs; | |
586 | else if (regno < 24) | |
587 | rp = (char *) &npx.reg[regno_mapping[regno].tss_ofs]; | |
53a5351d | 588 | else if (regno < 31) |
e49d4fa6 SS |
589 | rp = (char *) &npx + regno_mapping[regno].tss_ofs; |
590 | else | |
4ce44c66 | 591 | internal_error ("Invalid register no. %d in store_register.", regno); |
e49d4fa6 SS |
592 | memcpy (rp, v, regno_mapping[regno].size); |
593 | } | |
594 | ||
595 | static void | |
596 | go32_store_registers (int regno) | |
597 | { | |
598 | int r; | |
599 | ||
600 | if (regno >= 0) | |
601 | store_register (regno); | |
602 | else | |
603 | { | |
604 | for (r = 0; r < sizeof (regno_mapping) / sizeof (regno_mapping[0]); r++) | |
605 | store_register (r); | |
606 | } | |
607 | } | |
608 | ||
609 | static void | |
610 | go32_prepare_to_store (void) | |
611 | { | |
612 | } | |
613 | ||
614 | static int | |
615 | go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
616 | struct target_ops *target) | |
617 | { | |
618 | if (write) | |
619 | { | |
620 | if (write_child (memaddr, myaddr, len)) | |
621 | { | |
622 | return 0; | |
623 | } | |
624 | else | |
625 | { | |
626 | return len; | |
627 | } | |
628 | } | |
629 | else | |
630 | { | |
631 | if (read_child (memaddr, myaddr, len)) | |
632 | { | |
633 | return 0; | |
634 | } | |
635 | else | |
636 | { | |
637 | return len; | |
638 | } | |
639 | } | |
640 | } | |
641 | ||
53a5351d JM |
642 | static cmdline_t child_cmd; /* parsed child's command line kept here */ |
643 | ||
e49d4fa6 SS |
644 | static void |
645 | go32_files_info (struct target_ops *target) | |
646 | { | |
53a5351d | 647 | printf_unfiltered ("You are running a DJGPP V2 program.\n"); |
e49d4fa6 SS |
648 | } |
649 | ||
650 | static void | |
651 | go32_stop (void) | |
652 | { | |
653 | normal_stop (); | |
654 | cleanup_client (); | |
655 | inferior_pid = 0; | |
656 | prog_has_started = 0; | |
657 | } | |
658 | ||
659 | static void | |
660 | go32_kill_inferior (void) | |
661 | { | |
53a5351d JM |
662 | redir_cmdline_delete (&child_cmd); |
663 | resume_signal = -1; | |
664 | resume_is_step = 0; | |
e49d4fa6 SS |
665 | unpush_target (&go32_ops); |
666 | } | |
667 | ||
668 | static void | |
669 | go32_create_inferior (char *exec_file, char *args, char **env) | |
670 | { | |
671 | jmp_buf start_state; | |
672 | char *cmdline; | |
673 | char **env_save = environ; | |
674 | ||
675 | if (prog_has_started) | |
676 | { | |
b83266a0 | 677 | go32_stop (); |
e49d4fa6 SS |
678 | go32_kill_inferior (); |
679 | } | |
53a5351d JM |
680 | resume_signal = -1; |
681 | resume_is_step = 0; | |
682 | /* Init command line storage. */ | |
683 | if (redir_debug_init (&child_cmd) == -1) | |
4ce44c66 | 684 | internal_error ("Cannot allocate redirection storage: not enough memory.\n"); |
53a5351d JM |
685 | |
686 | /* Parse the command line and create redirections. */ | |
687 | if (strpbrk (args, "<>")) | |
688 | { | |
689 | if (redir_cmdline_parse (args, &child_cmd) == 0) | |
690 | args = child_cmd.command; | |
691 | else | |
692 | error ("Syntax error in command line."); | |
693 | } | |
694 | else | |
695 | child_cmd.command = strdup (args); | |
e49d4fa6 SS |
696 | |
697 | cmdline = (char *) alloca (strlen (args) + 4); | |
698 | cmdline[0] = strlen (args); | |
699 | strcpy (cmdline + 1, args); | |
700 | cmdline[strlen (args) + 1] = 13; | |
701 | ||
702 | environ = env; | |
703 | ||
704 | if (v2loadimage (exec_file, cmdline, start_state)) | |
705 | { | |
706 | environ = env_save; | |
707 | printf_unfiltered ("Load failed for image %s\n", exec_file); | |
708 | exit (1); | |
709 | } | |
710 | environ = env_save; | |
711 | ||
712 | edi_init (start_state); | |
53a5351d JM |
713 | #if __DJGPP_MINOR__ < 3 |
714 | save_npx (); | |
715 | #endif | |
e49d4fa6 SS |
716 | |
717 | inferior_pid = SOME_PID; | |
718 | push_target (&go32_ops); | |
719 | clear_proceed_status (); | |
720 | insert_breakpoints (); | |
2acceee2 | 721 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); |
b83266a0 | 722 | prog_has_started = 1; |
e49d4fa6 SS |
723 | } |
724 | ||
725 | static void | |
726 | go32_mourn_inferior (void) | |
727 | { | |
53a5351d JM |
728 | /* We need to make sure all the breakpoint enable bits in the DR7 |
729 | register are reset when the inferior exits. Otherwise, if they | |
730 | rerun the inferior, the uncleared bits may cause random SIGTRAPs, | |
731 | failure to set more watchpoints, and other calamities. It would | |
732 | be nice if GDB itself would take care to remove all breakpoints | |
733 | at all times, but it doesn't, probably under an assumption that | |
734 | the OS cleans up when the debuggee exits. */ | |
735 | cleanup_dregs (); | |
e49d4fa6 SS |
736 | go32_kill_inferior (); |
737 | generic_mourn_inferior (); | |
738 | } | |
739 | ||
740 | static int | |
741 | go32_can_run (void) | |
742 | { | |
743 | return 1; | |
744 | } | |
745 | ||
746 | static void | |
747 | ignore (void) | |
748 | { | |
749 | } | |
750 | ||
e49d4fa6 SS |
751 | /* Hardware watchpoint support. */ |
752 | ||
753 | #define DR_STATUS 6 | |
754 | #define DR_CONTROL 7 | |
755 | #define DR_ENABLE_SIZE 2 | |
756 | #define DR_LOCAL_ENABLE_SHIFT 0 | |
757 | #define DR_GLOBAL_ENABLE_SHIFT 1 | |
758 | #define DR_LOCAL_SLOWDOWN 0x100 | |
759 | #define DR_GLOBAL_SLOWDOWN 0x200 | |
760 | #define DR_CONTROL_SHIFT 16 | |
761 | #define DR_CONTROL_SIZE 4 | |
53a5351d | 762 | #define DR_RW_READWRITE 0x3 |
e49d4fa6 SS |
763 | #define DR_RW_WRITE 0x1 |
764 | #define DR_CONTROL_MASK 0xf | |
765 | #define DR_ENABLE_MASK 0x3 | |
766 | #define DR_LEN_1 0x0 | |
767 | #define DR_LEN_2 0x4 | |
768 | #define DR_LEN_4 0xc | |
769 | ||
770 | #define D_REGS edi.dr | |
771 | #define CONTROL D_REGS[DR_CONTROL] | |
772 | #define STATUS D_REGS[DR_STATUS] | |
773 | ||
774 | #define IS_REG_FREE(index) \ | |
53a5351d | 775 | (!(CONTROL & (3 << (DR_ENABLE_SIZE * (index))))) |
e49d4fa6 SS |
776 | |
777 | #define LOCAL_ENABLE_REG(index) \ | |
53a5351d | 778 | (CONTROL |= (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index)))) |
e49d4fa6 SS |
779 | |
780 | #define GLOBAL_ENABLE_REG(index) \ | |
53a5351d | 781 | (CONTROL |= (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index)))) |
e49d4fa6 SS |
782 | |
783 | #define DISABLE_REG(index) \ | |
53a5351d | 784 | (CONTROL &= ~(3 << (DR_ENABLE_SIZE * (index)))) |
e49d4fa6 SS |
785 | |
786 | #define SET_LOCAL_EXACT() \ | |
787 | (CONTROL |= DR_LOCAL_SLOWDOWN) | |
788 | ||
789 | #define SET_GLOBAL_EXACT() \ | |
790 | (CONTROL |= DR_GLOBAL_SLOWDOWN) | |
791 | ||
53a5351d JM |
792 | #define RESET_LOCAL_EXACT() \ |
793 | (CONTROL &= ~(DR_LOCAL_SLOWDOWN)) | |
794 | ||
795 | #define RESET_GLOBAL_EXACT() \ | |
796 | (CONTROL &= ~(DR_GLOBAL_SLOWDOWN)) | |
797 | ||
e49d4fa6 SS |
798 | #define SET_BREAK(index,address) \ |
799 | do {\ | |
53a5351d | 800 | CONTROL &= ~(DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index)));\ |
e49d4fa6 | 801 | D_REGS[index] = address;\ |
c2c6d25f | 802 | dr_ref_count[index]++;\ |
e49d4fa6 SS |
803 | } while(0) |
804 | ||
805 | #define SET_WATCH(index,address,rw,len) \ | |
806 | do {\ | |
807 | SET_BREAK(index,address);\ | |
53a5351d | 808 | CONTROL |= ((len)|(rw)) << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index));\ |
e49d4fa6 SS |
809 | } while (0) |
810 | ||
53a5351d JM |
811 | #define IS_WATCH(index) \ |
812 | (CONTROL & (DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE*(index)))) | |
813 | ||
c2c6d25f | 814 | #define WATCH_HIT(index) ((STATUS & (1 << (index))) && IS_WATCH(index)) |
e49d4fa6 | 815 | |
53a5351d JM |
816 | #define DR_DEF(index) \ |
817 | ((CONTROL >> (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index))) & 0x0f) | |
818 | ||
819 | ||
820 | #if 0 /* use debugging macro */ | |
821 | #define SHOW_DR(text,len) \ | |
e49d4fa6 | 822 | do { \ |
53a5351d | 823 | if (!getenv ("GDB_SHOW_DR")) break; \ |
e49d4fa6 | 824 | fprintf(stderr,"%08x %08x ",edi.dr[7],edi.dr[6]); \ |
53a5351d JM |
825 | fprintf(stderr,"%08x %d %08x %d ", \ |
826 | edi.dr[0],dr_ref_count[0],edi.dr[1],dr_ref_count[1]); \ | |
827 | fprintf(stderr,"%08x %d %08x %d ", \ | |
828 | edi.dr[2],dr_ref_count[2],edi.dr[3],dr_ref_count[3]); \ | |
829 | fprintf(stderr,(len)?"(%s:%d)\n":"(%s)\n",#text,len); \ | |
e49d4fa6 SS |
830 | } while (0) |
831 | #else | |
53a5351d | 832 | #define SHOW_DR(text,len) do {} while (0) |
e49d4fa6 SS |
833 | #endif |
834 | ||
53a5351d JM |
835 | static void |
836 | cleanup_dregs (void) | |
837 | { | |
838 | int i; | |
839 | ||
840 | CONTROL = 0; | |
841 | STATUS = 0; | |
842 | for (i = 0; i < 4; i++) | |
843 | { | |
844 | D_REGS[i] = 0; | |
845 | dr_ref_count[i] = 0; | |
846 | } | |
847 | } | |
848 | ||
e49d4fa6 SS |
849 | /* Insert a watchpoint. */ |
850 | ||
851 | int | |
852 | go32_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw) | |
853 | { | |
53a5351d | 854 | int ret = go32_insert_aligned_watchpoint (addr, addr, len, rw); |
e49d4fa6 | 855 | |
53a5351d | 856 | SHOW_DR (insert_watch, len); |
e49d4fa6 SS |
857 | return ret; |
858 | } | |
859 | ||
860 | static int | |
53a5351d | 861 | go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
e49d4fa6 SS |
862 | int len, int rw) |
863 | { | |
864 | int i; | |
865 | int read_write_bits, len_bits; | |
866 | ||
53a5351d JM |
867 | /* Values of rw: 0 - write, 1 - read, 2 - access (read and write). |
868 | However, x86 doesn't support read-only data breakpoints. */ | |
869 | read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE; | |
870 | ||
871 | switch (len) | |
872 | { | |
873 | case 4: | |
874 | len_bits = DR_LEN_4; | |
875 | break; | |
876 | case 2: | |
877 | len_bits = DR_LEN_2; | |
878 | break; | |
879 | case 1: | |
880 | len_bits = DR_LEN_1; | |
881 | break; | |
882 | default: | |
883 | /* The debug registers only have 2 bits for the length, so | |
884 | so this value will always fail the loop below. */ | |
885 | len_bits = 0x10; | |
886 | } | |
887 | ||
888 | /* Look for an occupied debug register with the same address and the | |
889 | same RW and LEN definitions. If we find one, we can use it for | |
890 | this watchpoint as well (and save a register). */ | |
891 | for (i = 0; i < 4; i++) | |
892 | { | |
893 | if (!IS_REG_FREE (i) && D_REGS[i] == addr | |
894 | && DR_DEF (i) == (len_bits | read_write_bits)) | |
e49d4fa6 | 895 | { |
53a5351d JM |
896 | dr_ref_count[i]++; |
897 | return 0; | |
e49d4fa6 | 898 | } |
53a5351d JM |
899 | } |
900 | ||
901 | /* Look for a free debug register. */ | |
902 | for (i = 0; i <= 3; i++) | |
903 | { | |
904 | if (IS_REG_FREE (i)) | |
905 | break; | |
906 | } | |
e49d4fa6 SS |
907 | |
908 | /* No more debug registers! */ | |
909 | if (i > 3) | |
910 | return -1; | |
911 | ||
53a5351d JM |
912 | if (len == 2) |
913 | { | |
914 | if (addr % 2) | |
915 | return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, | |
916 | len, rw); | |
917 | } | |
e49d4fa6 | 918 | else if (len == 4) |
53a5351d JM |
919 | { |
920 | if (addr % 4) | |
921 | return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, | |
922 | len, rw); | |
923 | } | |
924 | else if (len != 1) | |
925 | return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, len, rw); | |
e49d4fa6 SS |
926 | |
927 | SET_WATCH (i, addr, read_write_bits, len_bits); | |
928 | LOCAL_ENABLE_REG (i); | |
929 | SET_LOCAL_EXACT (); | |
53a5351d JM |
930 | SET_GLOBAL_EXACT (); |
931 | return 0; | |
e49d4fa6 SS |
932 | } |
933 | ||
934 | static int | |
53a5351d | 935 | go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr, CORE_ADDR addr, |
e49d4fa6 SS |
936 | int len, int rw) |
937 | { | |
938 | int align; | |
939 | int size; | |
53a5351d | 940 | int rv = 0, status = 0; |
e49d4fa6 SS |
941 | |
942 | static int size_try_array[16] = | |
943 | { | |
944 | 1, 1, 1, 1, /* trying size one */ | |
945 | 2, 1, 2, 1, /* trying size two */ | |
946 | 2, 1, 2, 1, /* trying size three */ | |
947 | 4, 1, 2, 1 /* trying size four */ | |
948 | }; | |
949 | ||
950 | while (len > 0) | |
951 | { | |
952 | align = addr % 4; | |
953 | /* Four is the maximum length for 386. */ | |
954 | size = (len > 4) ? 3 : len - 1; | |
955 | size = size_try_array[size * 4 + align]; | |
53a5351d JM |
956 | if (what == wp_insert) |
957 | status = go32_insert_aligned_watchpoint (waddr, addr, size, rw); | |
958 | else if (what == wp_remove) | |
959 | status = go32_remove_aligned_watchpoint (waddr, addr, size, rw); | |
960 | else if (what == wp_count) | |
961 | rv++; | |
962 | else | |
963 | status = -1; | |
964 | /* We keep the loop going even after a failure, because some of | |
965 | the other aligned watchpoints might still succeed, e.g. if | |
966 | they watch addresses that are already watched, and thus just | |
967 | increment the reference counts of occupied debug registers. | |
968 | If we break out of the loop too early, we could cause those | |
969 | addresses watched by other watchpoints to be disabled when | |
970 | GDB reacts to our failure to insert this watchpoint and tries | |
971 | to remove it. */ | |
972 | if (status) | |
973 | rv = status; | |
e49d4fa6 SS |
974 | addr += size; |
975 | len -= size; | |
976 | } | |
977 | return rv; | |
978 | } | |
979 | ||
980 | /* Remove a watchpoint. */ | |
981 | ||
982 | int | |
53a5351d JM |
983 | go32_remove_watchpoint (int pid, CORE_ADDR addr, int len, int rw) |
984 | { | |
985 | int ret = go32_remove_aligned_watchpoint (addr, addr, len, rw); | |
986 | ||
987 | SHOW_DR (remove_watch, len); | |
988 | return ret; | |
989 | } | |
990 | ||
991 | static int | |
992 | go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, | |
993 | int len, int rw) | |
e49d4fa6 SS |
994 | { |
995 | int i; | |
53a5351d JM |
996 | int read_write_bits, len_bits; |
997 | ||
998 | /* Values of rw: 0 - write, 1 - read, 2 - access (read and write). | |
999 | However, x86 doesn't support read-only data breakpoints. */ | |
1000 | read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE; | |
1001 | ||
1002 | switch (len) | |
1003 | { | |
1004 | case 4: | |
1005 | len_bits = DR_LEN_4; | |
1006 | break; | |
1007 | case 2: | |
1008 | len_bits = DR_LEN_2; | |
1009 | break; | |
1010 | case 1: | |
1011 | len_bits = DR_LEN_1; | |
1012 | break; | |
1013 | default: | |
1014 | /* The debug registers only have 2 bits for the length, so | |
1015 | so this value will always fail the loop below. */ | |
1016 | len_bits = 0x10; | |
1017 | } | |
1018 | ||
1019 | if (len == 2) | |
1020 | { | |
1021 | if (addr % 2) | |
1022 | return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, | |
1023 | len, rw); | |
1024 | } | |
1025 | else if (len == 4) | |
1026 | { | |
1027 | if (addr % 4) | |
1028 | return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, | |
1029 | len, rw); | |
1030 | } | |
1031 | else if (len != 1) | |
1032 | return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, len, rw); | |
e49d4fa6 SS |
1033 | |
1034 | for (i = 0; i <= 3; i++) | |
1035 | { | |
53a5351d JM |
1036 | if (!IS_REG_FREE (i) && D_REGS[i] == addr |
1037 | && DR_DEF (i) == (len_bits | read_write_bits)) | |
e49d4fa6 | 1038 | { |
53a5351d JM |
1039 | dr_ref_count[i]--; |
1040 | if (dr_ref_count[i] == 0) | |
1041 | DISABLE_REG (i); | |
e49d4fa6 SS |
1042 | } |
1043 | } | |
53a5351d JM |
1044 | RESET_LOCAL_EXACT (); |
1045 | RESET_GLOBAL_EXACT (); | |
e49d4fa6 SS |
1046 | |
1047 | return 0; | |
1048 | } | |
1049 | ||
53a5351d JM |
1050 | /* Can we use debug registers to watch a region whose address is ADDR |
1051 | and whose length is LEN bytes? */ | |
1052 | ||
1053 | int | |
1054 | go32_region_ok_for_watchpoint (CORE_ADDR addr, int len) | |
1055 | { | |
1056 | /* Compute how many aligned watchpoints we would need to cover this | |
1057 | region. */ | |
1058 | int nregs = go32_handle_nonaligned_watchpoint (wp_count, addr, addr, len, 0); | |
1059 | ||
1060 | return nregs <= 4 ? 1 : 0; | |
1061 | } | |
1062 | ||
1063 | /* Check if stopped by a data watchpoint. If so, return the address | |
1064 | whose access triggered the watchpoint. */ | |
e49d4fa6 SS |
1065 | |
1066 | CORE_ADDR | |
53a5351d | 1067 | go32_stopped_by_watchpoint (int pid, int data_watchpoint) |
e49d4fa6 SS |
1068 | { |
1069 | int i, ret = 0; | |
1070 | int status; | |
1071 | ||
1072 | status = edi.dr[DR_STATUS]; | |
53a5351d | 1073 | SHOW_DR (stopped_by, 0); |
e49d4fa6 SS |
1074 | for (i = 0; i <= 3; i++) |
1075 | { | |
53a5351d | 1076 | if (WATCH_HIT (i) && data_watchpoint) |
e49d4fa6 | 1077 | { |
53a5351d | 1078 | SHOW_DR (WP_HIT, 0); |
e49d4fa6 SS |
1079 | ret = D_REGS[i]; |
1080 | } | |
1081 | } | |
e49d4fa6 SS |
1082 | |
1083 | return ret; | |
1084 | } | |
1085 | ||
1086 | /* Remove a breakpoint. */ | |
1087 | ||
1088 | int | |
1089 | go32_remove_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow) | |
1090 | { | |
1091 | int i; | |
1092 | for (i = 0; i <= 3; i++) | |
1093 | { | |
53a5351d | 1094 | if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0) |
e49d4fa6 | 1095 | { |
53a5351d JM |
1096 | dr_ref_count[i]--; |
1097 | if (dr_ref_count[i] == 0) | |
1098 | DISABLE_REG (i); | |
e49d4fa6 SS |
1099 | } |
1100 | } | |
53a5351d | 1101 | SHOW_DR (remove_hw, 0); |
e49d4fa6 SS |
1102 | return 0; |
1103 | } | |
1104 | ||
1105 | int | |
1106 | go32_insert_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow) | |
1107 | { | |
1108 | int i; | |
1109 | int read_write_bits, len_bits; | |
1110 | int free_debug_register; | |
1111 | int register_number; | |
1112 | ||
53a5351d JM |
1113 | /* Look for an occupied debug register with the same address and the |
1114 | same RW and LEN definitions. If we find one, we can use it for | |
1115 | this breakpoint as well (and save a register). */ | |
1116 | for (i = 0; i < 4; i++) | |
1117 | { | |
1118 | if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0) | |
1119 | { | |
1120 | dr_ref_count[i]++; | |
1121 | SHOW_DR (insert_hw, 0); | |
1122 | return 0; | |
1123 | } | |
1124 | } | |
1125 | ||
e49d4fa6 SS |
1126 | /* Look for a free debug register. */ |
1127 | for (i = 0; i <= 3; i++) | |
1128 | { | |
1129 | if (IS_REG_FREE (i)) | |
1130 | break; | |
1131 | } | |
1132 | ||
53a5351d JM |
1133 | /* No more debug registers? */ |
1134 | if (i < 4) | |
1135 | { | |
1136 | SET_BREAK (i, addr); | |
1137 | LOCAL_ENABLE_REG (i); | |
1138 | } | |
1139 | SHOW_DR (insert_hw, 0); | |
e49d4fa6 | 1140 | |
53a5351d | 1141 | return i < 4 ? 0 : -1; |
e49d4fa6 SS |
1142 | } |
1143 | ||
53a5351d JM |
1144 | /* Put the device open on handle FD into either raw or cooked |
1145 | mode, return 1 if it was in raw mode, zero otherwise. */ | |
1146 | ||
1147 | static int | |
1148 | device_mode (int fd, int raw_p) | |
1149 | { | |
1150 | int oldmode, newmode; | |
1151 | __dpmi_regs regs; | |
1152 | ||
1153 | regs.x.ax = 0x4400; | |
1154 | regs.x.bx = fd; | |
1155 | __dpmi_int (0x21, ®s); | |
1156 | if (regs.x.flags & 1) | |
1157 | return -1; | |
1158 | newmode = oldmode = regs.x.dx; | |
1159 | ||
1160 | if (raw_p) | |
1161 | newmode |= 0x20; | |
1162 | else | |
1163 | newmode &= ~0x20; | |
1164 | ||
1165 | if (oldmode & 0x80) /* Only for character dev */ | |
1166 | { | |
1167 | regs.x.ax = 0x4401; | |
1168 | regs.x.bx = fd; | |
1169 | regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails */ | |
1170 | __dpmi_int (0x21, ®s); | |
1171 | if (regs.x.flags & 1) | |
1172 | return -1; | |
1173 | } | |
1174 | return (oldmode & 0x20) == 0x20; | |
1175 | } | |
1176 | ||
1177 | ||
1178 | static int inf_mode_valid = 0; | |
1179 | static int inf_terminal_mode; | |
1180 | ||
1181 | /* This semaphore is needed because, amazingly enough, GDB calls | |
1182 | target.to_terminal_ours more than once after the inferior stops. | |
1183 | But we need the information from the first call only, since the | |
1184 | second call will always see GDB's own cooked terminal. */ | |
1185 | static int terminal_is_ours = 1; | |
1186 | ||
cce74817 JM |
1187 | static void |
1188 | go32_terminal_init (void) | |
1189 | { | |
53a5351d JM |
1190 | inf_mode_valid = 0; /* reinitialize, in case they are restarting child */ |
1191 | terminal_is_ours = 1; | |
cce74817 JM |
1192 | } |
1193 | ||
1194 | static void | |
53a5351d | 1195 | go32_terminal_info (char *args, int from_tty) |
cce74817 | 1196 | { |
53a5351d JM |
1197 | printf_unfiltered ("Inferior's terminal is in %s mode.\n", |
1198 | !inf_mode_valid | |
1199 | ? "default" : inf_terminal_mode ? "raw" : "cooked"); | |
1200 | ||
1201 | #if __DJGPP_MINOR__ > 2 | |
1202 | if (child_cmd.redirection) | |
1203 | { | |
1204 | int i; | |
1205 | ||
1206 | for (i = 0; i < DBG_HANDLES; i++) | |
c5aa993b | 1207 | { |
53a5351d JM |
1208 | if (child_cmd.redirection[i]->file_name) |
1209 | printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n", | |
1210 | i, child_cmd.redirection[i]->file_name); | |
1211 | else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1) | |
1212 | printf_unfiltered | |
1213 | ("\tFile handle %d appears to be closed by inferior.\n", i); | |
1214 | /* Mask off the raw/cooked bit when comparing device info words. */ | |
1215 | else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf) | |
1216 | != (_get_dev_info (i) & 0xdf)) | |
1217 | printf_unfiltered | |
1218 | ("\tFile handle %d appears to be redirected by inferior.\n", i); | |
c5aa993b | 1219 | } |
53a5351d JM |
1220 | } |
1221 | #endif | |
1222 | } | |
1223 | ||
1224 | static void | |
1225 | go32_terminal_inferior (void) | |
1226 | { | |
1227 | /* Redirect standard handles as child wants them. */ | |
1228 | errno = 0; | |
1229 | if (redir_to_child (&child_cmd) == -1) | |
1230 | { | |
1231 | redir_to_debugger (&child_cmd); | |
1232 | error ("Cannot redirect standard handles for program: %s.", | |
1233 | strerror (errno)); | |
1234 | } | |
1235 | /* set the console device of the inferior to whatever mode | |
1236 | (raw or cooked) we found it last time */ | |
1237 | if (terminal_is_ours) | |
1238 | { | |
1239 | if (inf_mode_valid) | |
1240 | device_mode (0, inf_terminal_mode); | |
1241 | terminal_is_ours = 0; | |
1242 | } | |
cce74817 JM |
1243 | } |
1244 | ||
1245 | static void | |
1246 | go32_terminal_ours (void) | |
1247 | { | |
53a5351d JM |
1248 | /* Switch to cooked mode on the gdb terminal and save the inferior |
1249 | terminal mode to be restored when it is resumed */ | |
1250 | if (!terminal_is_ours) | |
1251 | { | |
1252 | inf_terminal_mode = device_mode (0, 0); | |
1253 | if (inf_terminal_mode != -1) | |
1254 | inf_mode_valid = 1; | |
1255 | else | |
1256 | /* If device_mode returned -1, we don't know what happens with | |
1257 | handle 0 anymore, so make the info invalid. */ | |
1258 | inf_mode_valid = 0; | |
1259 | terminal_is_ours = 1; | |
1260 | ||
1261 | /* Restore debugger's standard handles. */ | |
1262 | errno = 0; | |
1263 | if (redir_to_debugger (&child_cmd) == -1) | |
1264 | { | |
1265 | redir_to_child (&child_cmd); | |
1266 | error ("Cannot redirect standard handles for debugger: %s.", | |
1267 | strerror (errno)); | |
1268 | } | |
1269 | } | |
cce74817 JM |
1270 | } |
1271 | ||
e49d4fa6 SS |
1272 | static void |
1273 | init_go32_ops (void) | |
1274 | { | |
1275 | go32_ops.to_shortname = "djgpp"; | |
1276 | go32_ops.to_longname = "djgpp target process"; | |
1277 | go32_ops.to_doc = | |
1278 | "Program loaded by djgpp, when gdb is used as an external debugger"; | |
1279 | go32_ops.to_open = go32_open; | |
1280 | go32_ops.to_close = go32_close; | |
53a5351d | 1281 | go32_ops.to_attach = go32_attach; |
e49d4fa6 SS |
1282 | go32_ops.to_detach = go32_detach; |
1283 | go32_ops.to_resume = go32_resume; | |
1284 | go32_ops.to_wait = go32_wait; | |
1285 | go32_ops.to_fetch_registers = go32_fetch_registers; | |
1286 | go32_ops.to_store_registers = go32_store_registers; | |
1287 | go32_ops.to_prepare_to_store = go32_prepare_to_store; | |
1288 | go32_ops.to_xfer_memory = go32_xfer_memory; | |
1289 | go32_ops.to_files_info = go32_files_info; | |
1290 | go32_ops.to_insert_breakpoint = memory_insert_breakpoint; | |
1291 | go32_ops.to_remove_breakpoint = memory_remove_breakpoint; | |
cce74817 JM |
1292 | go32_ops.to_terminal_init = go32_terminal_init; |
1293 | go32_ops.to_terminal_inferior = go32_terminal_inferior; | |
53a5351d | 1294 | go32_ops.to_terminal_ours_for_output = go32_terminal_ours; |
cce74817 | 1295 | go32_ops.to_terminal_ours = go32_terminal_ours; |
53a5351d | 1296 | go32_ops.to_terminal_info = go32_terminal_info; |
e49d4fa6 SS |
1297 | go32_ops.to_kill = go32_kill_inferior; |
1298 | go32_ops.to_create_inferior = go32_create_inferior; | |
1299 | go32_ops.to_mourn_inferior = go32_mourn_inferior; | |
1300 | go32_ops.to_can_run = go32_can_run; | |
1301 | go32_ops.to_stop = go32_stop; | |
1302 | go32_ops.to_stratum = process_stratum; | |
1303 | go32_ops.to_has_all_memory = 1; | |
1304 | go32_ops.to_has_memory = 1; | |
1305 | go32_ops.to_has_stack = 1; | |
1306 | go32_ops.to_has_registers = 1; | |
1307 | go32_ops.to_has_execution = 1; | |
1308 | go32_ops.to_magic = OPS_MAGIC; | |
53a5351d JM |
1309 | |
1310 | /* Initialize child's cwd with the current one. */ | |
1311 | getcwd (child_cwd, sizeof (child_cwd)); | |
1312 | ||
1313 | /* Initialize child's command line storage. */ | |
1314 | if (redir_debug_init (&child_cmd) == -1) | |
4ce44c66 | 1315 | internal_error ("Cannot allocate redirection storage: not enough memory.\n"); |
e49d4fa6 SS |
1316 | } |
1317 | ||
1318 | void | |
1319 | _initialize_go32_nat (void) | |
1320 | { | |
1321 | init_go32_ops (); | |
1322 | add_target (&go32_ops); | |
1323 | } | |
53a5351d JM |
1324 | |
1325 | pid_t | |
1326 | tcgetpgrp (int fd) | |
1327 | { | |
1328 | if (isatty (fd)) | |
1329 | return SOME_PID; | |
1330 | errno = ENOTTY; | |
1331 | return -1; | |
1332 | } | |
1333 | ||
1334 | int | |
1335 | tcsetpgrp (int fd, pid_t pgid) | |
1336 | { | |
1337 | if (isatty (fd) && pgid == SOME_PID) | |
1338 | return 0; | |
1339 | errno = pgid == SOME_PID ? ENOTTY : ENOSYS; | |
1340 | return -1; | |
1341 | } |