1 /* Native debugging support for Intel x86 running DJGPP.
2 Copyright (C) 1997-2014 Free Software Foundation, Inc.
3 Written by Robert Hoehne.
5 This file is part of GDB.
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 3 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 /* To whomever it may concern, here's a general description of how
21 debugging in DJGPP works, and the special quirks GDB does to
24 When the DJGPP port of GDB is debugging a DJGPP program natively,
25 there aren't 2 separate processes, the debuggee and GDB itself, as
26 on other systems. (This is DOS, where there can only be one active
27 process at any given time, remember?) Instead, GDB and the
28 debuggee live in the same process. So when GDB calls
29 go32_create_inferior below, and that function calls edi_init from
30 the DJGPP debug support library libdbg.a, we load the debuggee's
31 executable file into GDB's address space, set it up for execution
32 as the stub loader (a short real-mode program prepended to each
33 DJGPP executable) normally would, and do a lot of preparations for
34 swapping between GDB's and debuggee's internal state, primarily wrt
35 the exception handlers. This swapping happens every time we resume
36 the debuggee or switch back to GDB's code, and it includes:
38 . swapping all the segment registers
39 . swapping the PSP (the Program Segment Prefix)
40 . swapping the signal handlers
41 . swapping the exception handlers
42 . swapping the FPU status
43 . swapping the 3 standard file handles (more about this below)
45 Then running the debuggee simply means longjmp into it where its PC
46 is and let it run until it stops for some reason. When it stops,
47 GDB catches the exception that stopped it and longjmp's back into
48 its own code. All the possible exit points of the debuggee are
49 watched; for example, the normal exit point is recognized because a
50 DOS program issues a special system call to exit. If one of those
51 exit points is hit, we mourn the inferior and clean up after it.
52 Cleaning up is very important, even if the process exits normally,
53 because otherwise we might leave behind traces of previous
54 execution, and in several cases GDB itself might be left hosed,
55 because all the exception handlers were not restored.
57 Swapping of the standard handles (in redir_to_child and
58 redir_to_debugger) is needed because, since both GDB and the
59 debuggee live in the same process, as far as the OS is concerned,
60 the share the same file table. This means that the standard
61 handles 0, 1, and 2 point to the same file table entries, and thus
62 are connected to the same devices. Therefore, if the debugger
63 redirects its standard output, the standard output of the debuggee
64 is also automagically redirected to the same file/device!
65 Similarly, if the debuggee redirects its stdout to a file, you
66 won't be able to see debugger's output (it will go to the same file
67 where the debuggee has its output); and if the debuggee closes its
68 standard input, you will lose the ability to talk to debugger!
70 For this reason, every time the debuggee is about to be resumed, we
71 call redir_to_child, which redirects the standard handles to where
72 the debuggee expects them to be. When the debuggee stops and GDB
73 regains control, we call redir_to_debugger, which redirects those 3
74 handles back to where GDB expects.
76 Note that only the first 3 handles are swapped, so if the debuggee
77 redirects or closes any other handles, GDB will not notice. In
78 particular, the exit code of a DJGPP program forcibly closes all
79 file handles beyond the first 3 ones, so when the debuggee exits,
80 GDB currently loses its stdaux and stdprn streams. Fortunately,
81 GDB does not use those as of this writing, and will never need
90 #include "gdbthread.h"
95 #include "floatformat.h"
97 #include "i387-tdep.h"
98 #include "i386-tdep.h"
99 #include "i386-cpuid.h"
101 #include "regcache.h"
104 #include "cli/cli-utils.h"
105 #include "inf-child.h"
107 #include <stdio.h> /* might be required for __DJGPP_MINOR__ */
112 #include <sys/utsname.h>
117 #include <sys/farptr.h>
118 #include <debug/v2load.h>
119 #include <debug/dbgcom.h>
120 #if __DJGPP_MINOR__ > 2
121 #include <debug/redir.h>
124 #include <langinfo.h>
126 #if __DJGPP_MINOR__ < 3
127 /* This code will be provided from DJGPP 2.03 on. Until then I code it
135 unsigned short exponent
:15;
136 unsigned short sign
:1;
142 unsigned int control
;
147 unsigned int dataptr
;
148 unsigned int datasel
;
155 static void save_npx (void); /* Save the FPU of the debugged program. */
156 static void load_npx (void); /* Restore the FPU of the debugged program. */
158 /* ------------------------------------------------------------------------- */
159 /* Store the contents of the NPX in the global variable `npx'. */
165 asm ("inb $0xa0, %%al \n\
166 testb $0x20, %%al \n\
184 /* ------------------------------------------------------------------------- */
185 /* Reload the contents of the NPX from the global variable `npx'. */
190 asm ("frstor %0":"=m" (npx
));
192 /* ------------------------------------------------------------------------- */
193 /* Stubs for the missing redirection functions. */
200 redir_cmdline_delete (cmdline_t
*ptr
)
206 redir_cmdline_parse (const char *args
, cmdline_t
*ptr
)
212 redir_to_child (cmdline_t
*ptr
)
218 redir_to_debugger (cmdline_t
*ptr
)
224 redir_debug_init (cmdline_t
*ptr
)
228 #endif /* __DJGPP_MINOR < 3 */
230 typedef enum { wp_insert
, wp_remove
, wp_count
} wp_op
;
232 /* This holds the current reference counts for each debug register. */
233 static int dr_ref_count
[4];
237 static int prog_has_started
= 0;
238 static void go32_mourn_inferior (struct target_ops
*ops
);
240 #define r_ofs(x) (offsetof(TSS,x))
249 {r_ofs (tss_eax
), 4}, /* normal registers, from a_tss */
250 {r_ofs (tss_ecx
), 4},
251 {r_ofs (tss_edx
), 4},
252 {r_ofs (tss_ebx
), 4},
253 {r_ofs (tss_esp
), 4},
254 {r_ofs (tss_ebp
), 4},
255 {r_ofs (tss_esi
), 4},
256 {r_ofs (tss_edi
), 4},
257 {r_ofs (tss_eip
), 4},
258 {r_ofs (tss_eflags
), 4},
265 {0, 10}, /* 8 FP registers, from npx.reg[] */
273 /* The order of the next 7 registers must be consistent
274 with their numbering in config/i386/tm-i386.h, which see. */
275 {0, 2}, /* control word, from npx */
276 {4, 2}, /* status word, from npx */
277 {8, 2}, /* tag word, from npx */
278 {16, 2}, /* last FP exception CS from npx */
279 {12, 4}, /* last FP exception EIP from npx */
280 {24, 2}, /* last FP exception operand selector from npx */
281 {20, 4}, /* last FP exception operand offset from npx */
282 {18, 2} /* last FP opcode from npx */
288 enum gdb_signal gdb_sig
;
293 {1, GDB_SIGNAL_TRAP
},
294 /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL,
295 but I think SIGBUS is better, since the NMI is usually activated
296 as a result of a memory parity check failure. */
298 {3, GDB_SIGNAL_TRAP
},
300 {5, GDB_SIGNAL_SEGV
},
302 {7, GDB_SIGNAL_EMT
}, /* no-coprocessor exception */
303 {8, GDB_SIGNAL_SEGV
},
304 {9, GDB_SIGNAL_SEGV
},
305 {10, GDB_SIGNAL_BUS
},
306 {11, GDB_SIGNAL_SEGV
},
307 {12, GDB_SIGNAL_SEGV
},
308 {13, GDB_SIGNAL_SEGV
},
309 {14, GDB_SIGNAL_SEGV
},
310 {16, GDB_SIGNAL_FPE
},
311 {17, GDB_SIGNAL_BUS
},
312 {31, GDB_SIGNAL_ILL
},
313 {0x1b, GDB_SIGNAL_INT
},
314 {0x75, GDB_SIGNAL_FPE
},
315 {0x78, GDB_SIGNAL_ALRM
},
316 {0x79, GDB_SIGNAL_INT
},
317 {0x7a, GDB_SIGNAL_QUIT
},
318 {-1, GDB_SIGNAL_LAST
}
322 enum gdb_signal gdb_sig
;
326 {GDB_SIGNAL_ILL
, 6}, /* Invalid Opcode */
327 {GDB_SIGNAL_EMT
, 7}, /* triggers SIGNOFP */
328 {GDB_SIGNAL_SEGV
, 13}, /* GPF */
329 {GDB_SIGNAL_BUS
, 17}, /* Alignment Check */
330 /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for
332 {GDB_SIGNAL_TERM
, 0x1b}, /* triggers Ctrl-Break type of SIGINT */
333 {GDB_SIGNAL_FPE
, 0x75},
334 {GDB_SIGNAL_INT
, 0x79},
335 {GDB_SIGNAL_QUIT
, 0x7a},
336 {GDB_SIGNAL_ALRM
, 0x78}, /* triggers SIGTIMR */
337 {GDB_SIGNAL_PROF
, 0x78},
338 {GDB_SIGNAL_LAST
, -1}
342 go32_open (char *name
, int from_tty
)
344 printf_unfiltered ("Done. Use the \"run\" command to run the program.\n");
348 go32_attach (struct target_ops
*ops
, char *args
, int from_tty
)
351 You cannot attach to a running program on this platform.\n\
352 Use the `run' command to run DJGPP programs."));
355 static int resume_is_step
;
356 static int resume_signal
= -1;
359 go32_resume (struct target_ops
*ops
,
360 ptid_t ptid
, int step
, enum gdb_signal siggnal
)
364 resume_is_step
= step
;
366 if (siggnal
!= GDB_SIGNAL_0
&& siggnal
!= GDB_SIGNAL_TRAP
)
368 for (i
= 0, resume_signal
= -1;
369 excepn_map
[i
].gdb_sig
!= GDB_SIGNAL_LAST
; i
++)
370 if (excepn_map
[i
].gdb_sig
== siggnal
)
372 resume_signal
= excepn_map
[i
].djgpp_excepno
;
375 if (resume_signal
== -1)
376 printf_unfiltered ("Cannot deliver signal %s on this platform.\n",
377 gdb_signal_to_name (siggnal
));
381 static char child_cwd
[FILENAME_MAX
];
384 go32_wait (struct target_ops
*ops
,
385 ptid_t ptid
, struct target_waitstatus
*status
, int options
)
388 unsigned char saved_opcode
;
389 unsigned long INT3_addr
= 0;
390 int stepping_over_INT
= 0;
392 a_tss
.tss_eflags
&= 0xfeff; /* Reset the single-step flag (TF). */
395 /* If the next instruction is INT xx or INTO, we need to handle
396 them specially. Intel manuals say that these instructions
397 reset the single-step flag (a.k.a. TF). However, it seems
398 that, at least in the DPMI environment, and at least when
399 stepping over the DPMI interrupt 31h, the problem is having
400 TF set at all when INT 31h is executed: the debuggee either
401 crashes (and takes the system with it) or is killed by a
404 So we need to emulate single-step mode: we put an INT3 opcode
405 right after the INT xx instruction, let the debuggee run
406 until it hits INT3 and stops, then restore the original
407 instruction which we overwrote with the INT3 opcode, and back
408 up the debuggee's EIP to that instruction. */
409 read_child (a_tss
.tss_eip
, &saved_opcode
, 1);
410 if (saved_opcode
== 0xCD || saved_opcode
== 0xCE)
412 unsigned char INT3_opcode
= 0xCC;
415 = saved_opcode
== 0xCD ? a_tss
.tss_eip
+ 2 : a_tss
.tss_eip
+ 1;
416 stepping_over_INT
= 1;
417 read_child (INT3_addr
, &saved_opcode
, 1);
418 write_child (INT3_addr
, &INT3_opcode
, 1);
421 a_tss
.tss_eflags
|= 0x0100; /* normal instruction: set TF */
424 /* The special value FFFFh in tss_trap indicates to run_child that
425 tss_irqn holds a signal to be delivered to the debuggee. */
426 if (resume_signal
<= -1)
429 a_tss
.tss_irqn
= 0xff;
433 a_tss
.tss_trap
= 0xffff; /* run_child looks for this. */
434 a_tss
.tss_irqn
= resume_signal
;
437 /* The child might change working directory behind our back. The
438 GDB users won't like the side effects of that when they work with
439 relative file names, and GDB might be confused by its current
440 directory not being in sync with the truth. So we always make a
441 point of changing back to where GDB thinks is its cwd, when we
442 return control to the debugger, but restore child's cwd before we
444 /* Initialize child_cwd, before the first call to run_child and not
445 in the initialization, so the child get also the changed directory
446 set with the gdb-command "cd ..." */
448 /* Initialize child's cwd with the current one. */
449 getcwd (child_cwd
, sizeof (child_cwd
));
453 #if __DJGPP_MINOR__ < 3
457 #if __DJGPP_MINOR__ < 3
461 /* Did we step over an INT xx instruction? */
462 if (stepping_over_INT
&& a_tss
.tss_eip
== INT3_addr
+ 1)
464 /* Restore the original opcode. */
465 a_tss
.tss_eip
--; /* EIP points *after* the INT3 instruction. */
466 write_child (a_tss
.tss_eip
, &saved_opcode
, 1);
467 /* Simulate a TRAP exception. */
469 a_tss
.tss_eflags
|= 0x0100;
472 getcwd (child_cwd
, sizeof (child_cwd
)); /* in case it has changed */
473 chdir (current_directory
);
475 if (a_tss
.tss_irqn
== 0x21)
477 status
->kind
= TARGET_WAITKIND_EXITED
;
478 status
->value
.integer
= a_tss
.tss_eax
& 0xff;
482 status
->value
.sig
= GDB_SIGNAL_UNKNOWN
;
483 status
->kind
= TARGET_WAITKIND_STOPPED
;
484 for (i
= 0; sig_map
[i
].go32_sig
!= -1; i
++)
486 if (a_tss
.tss_irqn
== sig_map
[i
].go32_sig
)
488 #if __DJGPP_MINOR__ < 3
489 if ((status
->value
.sig
= sig_map
[i
].gdb_sig
) !=
491 status
->kind
= TARGET_WAITKIND_SIGNALLED
;
493 status
->value
.sig
= sig_map
[i
].gdb_sig
;
499 return pid_to_ptid (SOME_PID
);
503 fetch_register (struct regcache
*regcache
, int regno
)
505 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
506 if (regno
< gdbarch_fp0_regnum (gdbarch
))
507 regcache_raw_supply (regcache
, regno
,
508 (char *) &a_tss
+ regno_mapping
[regno
].tss_ofs
);
509 else if (i386_fp_regnum_p (gdbarch
, regno
) || i386_fpc_regnum_p (gdbarch
,
511 i387_supply_fsave (regcache
, regno
, &npx
);
513 internal_error (__FILE__
, __LINE__
,
514 _("Invalid register no. %d in fetch_register."), regno
);
518 go32_fetch_registers (struct target_ops
*ops
,
519 struct regcache
*regcache
, int regno
)
522 fetch_register (regcache
, regno
);
526 regno
< gdbarch_fp0_regnum (get_regcache_arch (regcache
));
528 fetch_register (regcache
, regno
);
529 i387_supply_fsave (regcache
, -1, &npx
);
534 store_register (const struct regcache
*regcache
, int regno
)
536 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
537 if (regno
< gdbarch_fp0_regnum (gdbarch
))
538 regcache_raw_collect (regcache
, regno
,
539 (char *) &a_tss
+ regno_mapping
[regno
].tss_ofs
);
540 else if (i386_fp_regnum_p (gdbarch
, regno
) || i386_fpc_regnum_p (gdbarch
,
542 i387_collect_fsave (regcache
, regno
, &npx
);
544 internal_error (__FILE__
, __LINE__
,
545 _("Invalid register no. %d in store_register."), regno
);
549 go32_store_registers (struct target_ops
*ops
,
550 struct regcache
*regcache
, int regno
)
555 store_register (regcache
, regno
);
558 for (r
= 0; r
< gdbarch_fp0_regnum (get_regcache_arch (regcache
)); r
++)
559 store_register (regcache
, r
);
560 i387_collect_fsave (regcache
, -1, &npx
);
564 /* Const-correct version of DJGPP's write_child, which unfortunately
565 takes a non-const buffer pointer. */
568 my_write_child (unsigned child_addr
, const void *buf
, unsigned len
)
570 static void *buffer
= NULL
;
571 static unsigned buffer_len
= 0;
574 if (buffer_len
< len
)
576 buffer
= xrealloc (buffer
, len
);
580 memcpy (buffer
, buf
, len
);
581 res
= write_child (child_addr
, buffer
, len
);
585 /* Helper for go32_xfer_partial that handles memory transfers.
586 Arguments are like target_xfer_partial. */
588 static enum target_xfer_status
589 go32_xfer_memory (gdb_byte
*readbuf
, const gdb_byte
*writebuf
,
590 ULONGEST memaddr
, ULONGEST len
, ULONGEST
*xfered_len
)
594 if (writebuf
!= NULL
)
595 res
= my_write_child (memaddr
, writebuf
, len
);
597 res
= read_child (memaddr
, readbuf
, len
);
600 return TARGET_XFER_E_IO
;
603 return TARGET_XFER_OK
;
606 /* Target to_xfer_partial implementation. */
608 static enum target_xfer_status
609 go32_xfer_partial (struct target_ops
*ops
, enum target_object object
,
610 const char *annex
, gdb_byte
*readbuf
,
611 const gdb_byte
*writebuf
, ULONGEST offset
, ULONGEST len
,
612 ULONGEST
*xfered_len
)
616 case TARGET_OBJECT_MEMORY
:
617 return go32_xfer_memory (readbuf
, writebuf
, offset
, len
, xfered_len
);
620 return ops
->beneath
->to_xfer_partial (ops
->beneath
, object
, annex
,
621 readbuf
, writebuf
, offset
, len
,
626 static cmdline_t child_cmd
; /* Parsed child's command line kept here. */
629 go32_files_info (struct target_ops
*target
)
631 printf_unfiltered ("You are running a DJGPP V2 program.\n");
635 go32_kill_inferior (struct target_ops
*ops
)
637 go32_mourn_inferior (ops
);
641 go32_create_inferior (struct target_ops
*ops
, char *exec_file
,
642 char *args
, char **env
, int from_tty
)
644 extern char **environ
;
647 char **env_save
= environ
;
649 struct inferior
*inf
;
651 /* If no exec file handed to us, get it from the exec-file command -- with
652 a good, common error message if none is specified. */
654 exec_file
= get_exec_file (1);
659 /* Initialize child's cwd as empty to be initialized when starting
663 /* Init command line storage. */
664 if (redir_debug_init (&child_cmd
) == -1)
665 internal_error (__FILE__
, __LINE__
,
666 _("Cannot allocate redirection storage: "
667 "not enough memory.\n"));
669 /* Parse the command line and create redirections. */
670 if (strpbrk (args
, "<>"))
672 if (redir_cmdline_parse (args
, &child_cmd
) == 0)
673 args
= child_cmd
.command
;
675 error (_("Syntax error in command line."));
678 child_cmd
.command
= xstrdup (args
);
680 cmdlen
= strlen (args
);
681 /* v2loadimage passes command lines via DOS memory, so it cannot
682 possibly handle commands longer than 1MB. */
683 if (cmdlen
> 1024*1024)
684 error (_("Command line too long."));
686 cmdline
= xmalloc (cmdlen
+ 4);
687 strcpy (cmdline
+ 1, args
);
688 /* If the command-line length fits into DOS 126-char limits, use the
689 DOS command tail format; otherwise, tell v2loadimage to pass it
690 through a buffer in conventional memory. */
693 cmdline
[0] = strlen (args
);
694 cmdline
[cmdlen
+ 1] = 13;
697 cmdline
[0] = 0xff; /* Signal v2loadimage it's a long command. */
701 if (v2loadimage (exec_file
, cmdline
, start_state
))
704 printf_unfiltered ("Load failed for image %s\n", exec_file
);
710 edi_init (start_state
);
711 #if __DJGPP_MINOR__ < 3
715 inferior_ptid
= pid_to_ptid (SOME_PID
);
716 inf
= current_inferior ();
717 inferior_appeared (inf
, SOME_PID
);
721 add_thread_silent (inferior_ptid
);
723 clear_proceed_status ();
724 insert_breakpoints ();
725 prog_has_started
= 1;
729 go32_mourn_inferior (struct target_ops
*ops
)
733 redir_cmdline_delete (&child_cmd
);
739 /* We need to make sure all the breakpoint enable bits in the DR7
740 register are reset when the inferior exits. Otherwise, if they
741 rerun the inferior, the uncleared bits may cause random SIGTRAPs,
742 failure to set more watchpoints, and other calamities. It would
743 be nice if GDB itself would take care to remove all breakpoints
744 at all times, but it doesn't, probably under an assumption that
745 the OS cleans up when the debuggee exits. */
746 i386_cleanup_dregs ();
748 ptid
= inferior_ptid
;
749 inferior_ptid
= null_ptid
;
750 delete_thread_silent (ptid
);
751 prog_has_started
= 0;
754 generic_mourn_inferior ();
757 /* Hardware watchpoint support. */
759 #define D_REGS edi.dr
760 #define CONTROL D_REGS[7]
761 #define STATUS D_REGS[6]
763 /* Pass the address ADDR to the inferior in the I'th debug register.
764 Here we just store the address in D_REGS, the watchpoint will be
765 actually set up when go32_wait runs the debuggee. */
767 go32_set_dr (int i
, CORE_ADDR addr
)
770 internal_error (__FILE__
, __LINE__
,
771 _("Invalid register %d in go32_set_dr.\n"), i
);
775 /* Pass the value VAL to the inferior in the DR7 debug control
776 register. Here we just store the address in D_REGS, the watchpoint
777 will be actually set up when go32_wait runs the debuggee. */
779 go32_set_dr7 (unsigned long val
)
784 /* Get the value of the DR6 debug status register from the inferior.
785 Here we just return the value stored in D_REGS, as we've got it
786 from the last go32_wait call. */
793 /* Get the value of the DR7 debug status register from the inferior.
794 Here we just return the value stored in D_REGS, as we've got it
795 from the last go32_wait call. */
803 /* Get the value of the DR debug register I from the inferior. Here
804 we just return the value stored in D_REGS, as we've got it from the
805 last go32_wait call. */
811 internal_error (__FILE__
, __LINE__
,
812 _("Invalid register %d in go32_get_dr.\n"), i
);
816 /* Put the device open on handle FD into either raw or cooked
817 mode, return 1 if it was in raw mode, zero otherwise. */
820 device_mode (int fd
, int raw_p
)
822 int oldmode
, newmode
;
827 __dpmi_int (0x21, ®s
);
828 if (regs
.x
.flags
& 1)
830 newmode
= oldmode
= regs
.x
.dx
;
837 if (oldmode
& 0x80) /* Only for character dev. */
841 regs
.x
.dx
= newmode
& 0xff; /* Force upper byte zero, else it fails. */
842 __dpmi_int (0x21, ®s
);
843 if (regs
.x
.flags
& 1)
846 return (oldmode
& 0x20) == 0x20;
850 static int inf_mode_valid
= 0;
851 static int inf_terminal_mode
;
853 /* This semaphore is needed because, amazingly enough, GDB calls
854 target.to_terminal_ours more than once after the inferior stops.
855 But we need the information from the first call only, since the
856 second call will always see GDB's own cooked terminal. */
857 static int terminal_is_ours
= 1;
860 go32_terminal_init (struct target_ops
*self
)
862 inf_mode_valid
= 0; /* Reinitialize, in case they are restarting child. */
863 terminal_is_ours
= 1;
867 go32_terminal_info (struct target_ops
*self
, const char *args
, int from_tty
)
869 printf_unfiltered ("Inferior's terminal is in %s mode.\n",
871 ? "default" : inf_terminal_mode
? "raw" : "cooked");
873 #if __DJGPP_MINOR__ > 2
874 if (child_cmd
.redirection
)
878 for (i
= 0; i
< DBG_HANDLES
; i
++)
880 if (child_cmd
.redirection
[i
]->file_name
)
881 printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n",
882 i
, child_cmd
.redirection
[i
]->file_name
);
883 else if (_get_dev_info (child_cmd
.redirection
[i
]->inf_handle
) == -1)
885 ("\tFile handle %d appears to be closed by inferior.\n", i
);
886 /* Mask off the raw/cooked bit when comparing device info words. */
887 else if ((_get_dev_info (child_cmd
.redirection
[i
]->inf_handle
) & 0xdf)
888 != (_get_dev_info (i
) & 0xdf))
890 ("\tFile handle %d appears to be redirected by inferior.\n", i
);
897 go32_terminal_inferior (struct target_ops
*self
)
899 /* Redirect standard handles as child wants them. */
901 if (redir_to_child (&child_cmd
) == -1)
903 redir_to_debugger (&child_cmd
);
904 error (_("Cannot redirect standard handles for program: %s."),
905 safe_strerror (errno
));
907 /* Set the console device of the inferior to whatever mode
908 (raw or cooked) we found it last time. */
909 if (terminal_is_ours
)
912 device_mode (0, inf_terminal_mode
);
913 terminal_is_ours
= 0;
918 go32_terminal_ours (struct target_ops
*self
)
920 /* Switch to cooked mode on the gdb terminal and save the inferior
921 terminal mode to be restored when it is resumed. */
922 if (!terminal_is_ours
)
924 inf_terminal_mode
= device_mode (0, 0);
925 if (inf_terminal_mode
!= -1)
928 /* If device_mode returned -1, we don't know what happens with
929 handle 0 anymore, so make the info invalid. */
931 terminal_is_ours
= 1;
933 /* Restore debugger's standard handles. */
935 if (redir_to_debugger (&child_cmd
) == -1)
937 redir_to_child (&child_cmd
);
938 error (_("Cannot redirect standard handles for debugger: %s."),
939 safe_strerror (errno
));
945 go32_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
947 return !ptid_equal (inferior_ptid
, null_ptid
);
951 go32_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
953 return normal_pid_to_str (ptid
);
956 /* Create a go32 target. */
958 static struct target_ops
*
961 struct target_ops
*t
= inf_child_target ();
963 t
->to_open
= go32_open
;
964 t
->to_attach
= go32_attach
;
965 t
->to_resume
= go32_resume
;
966 t
->to_wait
= go32_wait
;
967 t
->to_fetch_registers
= go32_fetch_registers
;
968 t
->to_store_registers
= go32_store_registers
;
969 t
->to_xfer_partial
= go32_xfer_partial
;
970 t
->to_files_info
= go32_files_info
;
971 t
->to_terminal_init
= go32_terminal_init
;
972 t
->to_terminal_inferior
= go32_terminal_inferior
;
973 t
->to_terminal_ours_for_output
= go32_terminal_ours
;
974 t
->to_terminal_ours
= go32_terminal_ours
;
975 t
->to_terminal_info
= go32_terminal_info
;
976 t
->to_kill
= go32_kill_inferior
;
977 t
->to_create_inferior
= go32_create_inferior
;
978 t
->to_mourn_inferior
= go32_mourn_inferior
;
979 t
->to_thread_alive
= go32_thread_alive
;
980 t
->to_pid_to_str
= go32_pid_to_str
;
985 /* Return the current DOS codepage number. */
992 __dpmi_int (0x21, ®s
);
993 if (!(regs
.x
.flags
& 1))
994 return regs
.x
.bx
& 0xffff;
996 return 437; /* default */
999 /* Limited emulation of `nl_langinfo', for charset.c. */
1001 nl_langinfo (nl_item item
)
1009 /* 8 is enough for SHORT_MAX + "CP" + null. */
1011 int blen
= sizeof (buf
);
1012 int needed
= snprintf (buf
, blen
, "CP%d", dos_codepage ());
1014 if (needed
> blen
) /* Should never happen. */
1016 retval
= xstrdup (buf
);
1020 retval
= xstrdup ("");
1026 unsigned short windows_major
, windows_minor
;
1028 /* Compute the version Windows reports via Int 2Fh/AX=1600h. */
1030 go32_get_windows_version(void)
1035 __dpmi_int(0x2f, &r
);
1036 if (r
.h
.al
> 2 && r
.h
.al
!= 0x80 && r
.h
.al
!= 0xff
1037 && (r
.h
.al
> 3 || r
.h
.ah
> 0))
1039 windows_major
= r
.h
.al
;
1040 windows_minor
= r
.h
.ah
;
1043 windows_major
= 0xff; /* meaning no Windows */
1046 /* A subroutine of go32_sysinfo to display memory info. */
1048 print_mem (unsigned long datum
, const char *header
, int in_pages_p
)
1050 if (datum
!= 0xffffffffUL
)
1054 puts_filtered (header
);
1057 printf_filtered ("%lu KB", datum
>> 10);
1058 if (datum
> 1024 * 1024)
1059 printf_filtered (" (%lu MB)", datum
>> 20);
1062 printf_filtered ("%lu Bytes", datum
);
1063 puts_filtered ("\n");
1067 /* Display assorted information about the underlying OS. */
1069 go32_sysinfo (char *arg
, int from_tty
)
1071 static const char test_pattern
[] =
1072 "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf"
1073 "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf"
1074 "deadbeafdeadbeafdeadbeafdeadbeafdeadbeafdeadbeaf";
1076 char cpuid_vendor
[13];
1077 unsigned cpuid_max
= 0, cpuid_eax
, cpuid_ebx
, cpuid_ecx
, cpuid_edx
;
1078 unsigned true_dos_version
= _get_dos_version (1);
1079 unsigned advertized_dos_version
= ((unsigned int)_osmajor
<< 8) | _osminor
;
1081 char dpmi_vendor_info
[129];
1082 int dpmi_vendor_available
;
1083 __dpmi_version_ret dpmi_version_data
;
1085 __dpmi_free_mem_info mem_info
;
1088 cpuid_vendor
[0] = '\0';
1090 strcpy (u
.machine
, "Unknown x86");
1091 else if (u
.machine
[0] == 'i' && u
.machine
[1] > 4)
1093 /* CPUID with EAX = 0 returns the Vendor ID. */
1095 /* Ideally we would use i386_cpuid(), but it needs someone to run
1096 native tests first to make sure things actually work. They should.
1097 http://sourceware.org/ml/gdb-patches/2013-05/msg00164.html */
1098 unsigned int eax
, ebx
, ecx
, edx
;
1100 if (i386_cpuid (0, &eax
, &ebx
, &ecx
, &edx
))
1103 memcpy (&vendor
[0], &ebx
, 4);
1104 memcpy (&vendor
[4], &ecx
, 4);
1105 memcpy (&vendor
[8], &edx
, 4);
1106 cpuid_vendor
[12] = '\0';
1109 __asm__
__volatile__ ("xorl %%ebx, %%ebx;"
1110 "xorl %%ecx, %%ecx;"
1111 "xorl %%edx, %%edx;"
1118 : "=m" (cpuid_vendor
[0]),
1119 "=m" (cpuid_vendor
[4]),
1120 "=m" (cpuid_vendor
[8]),
1123 : "%eax", "%ebx", "%ecx", "%edx");
1124 cpuid_vendor
[12] = '\0';
1128 printf_filtered ("CPU Type.......................%s", u
.machine
);
1129 if (cpuid_vendor
[0])
1130 printf_filtered (" (%s)", cpuid_vendor
);
1131 puts_filtered ("\n");
1133 /* CPUID with EAX = 1 returns processor signature and features. */
1136 static char *brand_name
[] = {
1144 char cpu_string
[80];
1147 int intel_p
= strcmp (cpuid_vendor
, "GenuineIntel") == 0;
1148 int amd_p
= strcmp (cpuid_vendor
, "AuthenticAMD") == 0;
1149 unsigned cpu_family
, cpu_model
;
1152 /* See comment above about cpuid usage. */
1153 i386_cpuid (1, &cpuid_eax
, &cpuid_ebx
, NULL
, &cpuid_edx
);
1155 __asm__
__volatile__ ("movl $1, %%eax;"
1163 brand_idx
= cpuid_ebx
& 0xff;
1164 cpu_family
= (cpuid_eax
>> 8) & 0xf;
1165 cpu_model
= (cpuid_eax
>> 4) & 0xf;
1166 cpu_brand
[0] = '\0';
1170 && brand_idx
< sizeof(brand_name
)/sizeof(brand_name
[0])
1171 && *brand_name
[brand_idx
])
1172 strcpy (cpu_brand
, brand_name
[brand_idx
]);
1173 else if (cpu_family
== 5)
1175 if (((cpuid_eax
>> 12) & 3) == 0 && cpu_model
== 4)
1176 strcpy (cpu_brand
, " MMX");
1177 else if (cpu_model
> 1 && ((cpuid_eax
>> 12) & 3) == 1)
1178 strcpy (cpu_brand
, " OverDrive");
1179 else if (cpu_model
> 1 && ((cpuid_eax
>> 12) & 3) == 2)
1180 strcpy (cpu_brand
, " Dual");
1182 else if (cpu_family
== 6 && cpu_model
< 8)
1187 strcpy (cpu_brand
, " Pro");
1190 strcpy (cpu_brand
, " II");
1193 strcpy (cpu_brand
, " II Xeon");
1196 strcpy (cpu_brand
, " Celeron");
1199 strcpy (cpu_brand
, " III");
1209 strcpy (cpu_brand
, "486/5x86");
1218 strcpy (cpu_brand
, "-K5");
1222 strcpy (cpu_brand
, "-K6");
1225 strcpy (cpu_brand
, "-K6-2");
1228 strcpy (cpu_brand
, "-K6-III");
1238 strcpy (cpu_brand
, " Athlon");
1241 strcpy (cpu_brand
, " Duron");
1247 xsnprintf (cpu_string
, sizeof (cpu_string
), "%s%s Model %d Stepping %d",
1248 intel_p
? "Pentium" : (amd_p
? "AMD" : "ix86"),
1249 cpu_brand
, cpu_model
, cpuid_eax
& 0xf);
1250 printfi_filtered (31, "%s\n", cpu_string
);
1251 if (((cpuid_edx
& (6 | (0x0d << 23))) != 0)
1252 || ((cpuid_edx
& 1) == 0)
1253 || (amd_p
&& (cpuid_edx
& (3 << 30)) != 0))
1255 puts_filtered ("CPU Features...................");
1256 /* We only list features which might be useful in the DPMI
1258 if ((cpuid_edx
& 1) == 0)
1259 puts_filtered ("No FPU "); /* It's unusual to not have an FPU. */
1260 if ((cpuid_edx
& (1 << 1)) != 0)
1261 puts_filtered ("VME ");
1262 if ((cpuid_edx
& (1 << 2)) != 0)
1263 puts_filtered ("DE ");
1264 if ((cpuid_edx
& (1 << 4)) != 0)
1265 puts_filtered ("TSC ");
1266 if ((cpuid_edx
& (1 << 23)) != 0)
1267 puts_filtered ("MMX ");
1268 if ((cpuid_edx
& (1 << 25)) != 0)
1269 puts_filtered ("SSE ");
1270 if ((cpuid_edx
& (1 << 26)) != 0)
1271 puts_filtered ("SSE2 ");
1274 if ((cpuid_edx
& (1 << 31)) != 0)
1275 puts_filtered ("3DNow! ");
1276 if ((cpuid_edx
& (1 << 30)) != 0)
1277 puts_filtered ("3DNow!Ext");
1279 puts_filtered ("\n");
1282 puts_filtered ("\n");
1283 printf_filtered ("DOS Version....................%s %s.%s",
1284 _os_flavor
, u
.release
, u
.version
);
1285 if (true_dos_version
!= advertized_dos_version
)
1286 printf_filtered (" (disguised as v%d.%d)", _osmajor
, _osminor
);
1287 puts_filtered ("\n");
1289 go32_get_windows_version ();
1290 if (windows_major
!= 0xff)
1292 const char *windows_flavor
;
1294 printf_filtered ("Windows Version................%d.%02d (Windows ",
1295 windows_major
, windows_minor
);
1296 switch (windows_major
)
1299 windows_flavor
= "3.X";
1302 switch (windows_minor
)
1305 windows_flavor
= "95, 95A, or 95B";
1308 windows_flavor
= "95B OSR2.1 or 95C OSR2.5";
1311 windows_flavor
= "98 or 98 SE";
1314 windows_flavor
= "ME";
1317 windows_flavor
= "9X";
1322 windows_flavor
= "??";
1325 printf_filtered ("%s)\n", windows_flavor
);
1327 else if (true_dos_version
== 0x532 && advertized_dos_version
== 0x500)
1328 printf_filtered ("Windows Version................"
1329 "Windows NT family (W2K/XP/W2K3/Vista/W2K8)\n");
1330 puts_filtered ("\n");
1331 /* On some versions of Windows, __dpmi_get_capabilities returns
1332 zero, but the buffer is not filled with info, so we fill the
1333 buffer with a known pattern and test for it afterwards. */
1334 memcpy (dpmi_vendor_info
, test_pattern
, sizeof(dpmi_vendor_info
));
1335 dpmi_vendor_available
=
1336 __dpmi_get_capabilities (&dpmi_flags
, dpmi_vendor_info
);
1337 if (dpmi_vendor_available
== 0
1338 && memcmp (dpmi_vendor_info
, test_pattern
,
1339 sizeof(dpmi_vendor_info
)) != 0)
1341 /* The DPMI spec says the vendor string should be ASCIIZ, but
1342 I don't trust the vendors to follow that... */
1343 if (!memchr (&dpmi_vendor_info
[2], 0, 126))
1344 dpmi_vendor_info
[128] = '\0';
1345 printf_filtered ("DPMI Host......................"
1346 "%s v%d.%d (capabilities: %#x)\n",
1347 &dpmi_vendor_info
[2],
1348 (unsigned)dpmi_vendor_info
[0],
1349 (unsigned)dpmi_vendor_info
[1],
1350 ((unsigned)dpmi_flags
& 0x7f));
1353 printf_filtered ("DPMI Host......................(Info not available)\n");
1354 __dpmi_get_version (&dpmi_version_data
);
1355 printf_filtered ("DPMI Version...................%d.%02d\n",
1356 dpmi_version_data
.major
, dpmi_version_data
.minor
);
1357 printf_filtered ("DPMI Info......................"
1358 "%s-bit DPMI, with%s Virtual Memory support\n",
1359 (dpmi_version_data
.flags
& 1) ? "32" : "16",
1360 (dpmi_version_data
.flags
& 4) ? "" : "out");
1361 printfi_filtered (31, "Interrupts reflected to %s mode\n",
1362 (dpmi_version_data
.flags
& 2) ? "V86" : "Real");
1363 printfi_filtered (31, "Processor type: i%d86\n",
1364 dpmi_version_data
.cpu
);
1365 printfi_filtered (31, "PIC base interrupt: Master: %#x Slave: %#x\n",
1366 dpmi_version_data
.master_pic
, dpmi_version_data
.slave_pic
);
1368 /* a_tss is only initialized when the debuggee is first run. */
1369 if (prog_has_started
)
1371 __asm__
__volatile__ ("pushfl ; popl %0" : "=g" (eflags
));
1372 printf_filtered ("Protection....................."
1373 "Ring %d (in %s), with%s I/O protection\n",
1374 a_tss
.tss_cs
& 3, (a_tss
.tss_cs
& 4) ? "LDT" : "GDT",
1375 (a_tss
.tss_cs
& 3) > ((eflags
>> 12) & 3) ? "" : "out");
1377 puts_filtered ("\n");
1378 __dpmi_get_free_memory_information (&mem_info
);
1379 print_mem (mem_info
.total_number_of_physical_pages
,
1380 "DPMI Total Physical Memory.....", 1);
1381 print_mem (mem_info
.total_number_of_free_pages
,
1382 "DPMI Free Physical Memory......", 1);
1383 print_mem (mem_info
.size_of_paging_file_partition_in_pages
,
1384 "DPMI Swap Space................", 1);
1385 print_mem (mem_info
.linear_address_space_size_in_pages
,
1386 "DPMI Total Linear Address Size.", 1);
1387 print_mem (mem_info
.free_linear_address_space_in_pages
,
1388 "DPMI Free Linear Address Size..", 1);
1389 print_mem (mem_info
.largest_available_free_block_in_bytes
,
1390 "DPMI Largest Free Memory Block.", 0);
1394 __dpmi_int (0x21, ®s
);
1395 print_mem (regs
.x
.bx
<< 4, "Free DOS Memory................", 0);
1397 __dpmi_int (0x21, ®s
);
1398 if ((regs
.x
.flags
& 1) == 0)
1400 static const char *dos_hilo
[] = {
1401 "Low", "", "", "", "High", "", "", "", "High, then Low"
1403 static const char *dos_fit
[] = {
1404 "First", "Best", "Last"
1406 int hilo_idx
= (regs
.x
.ax
>> 4) & 0x0f;
1407 int fit_idx
= regs
.x
.ax
& 0x0f;
1413 printf_filtered ("DOS Memory Allocation..........%s memory, %s fit\n",
1414 dos_hilo
[hilo_idx
], dos_fit
[fit_idx
]);
1416 __dpmi_int (0x21, ®s
);
1417 if ((regs
.x
.flags
& 1) != 0)
1419 printfi_filtered (31, "UMBs %sin DOS memory chain\n",
1420 regs
.h
.al
== 0 ? "not " : "");
1425 unsigned short limit0
;
1426 unsigned short base0
;
1427 unsigned char base1
;
1432 unsigned available
:1;
1435 unsigned page_granular
:1;
1436 unsigned char base2
;
1437 } __attribute__ ((packed
));
1440 unsigned short offset0
;
1441 unsigned short selector
;
1442 unsigned param_count
:5;
1447 unsigned short offset1
;
1448 } __attribute__ ((packed
));
1450 /* Read LEN bytes starting at logical address ADDR, and put the result
1451 into DEST. Return 1 if success, zero if not. */
1453 read_memory_region (unsigned long addr
, void *dest
, size_t len
)
1455 unsigned long dos_ds_limit
= __dpmi_get_segment_limit (_dos_ds
);
1458 /* For the low memory, we can simply use _dos_ds. */
1459 if (addr
<= dos_ds_limit
- len
)
1460 dosmemget (addr
, len
, dest
);
1463 /* For memory above 1MB we need to set up a special segment to
1464 be able to access that memory. */
1465 int sel
= __dpmi_allocate_ldt_descriptors (1);
1471 int access_rights
= __dpmi_get_descriptor_access_rights (sel
);
1472 size_t segment_limit
= len
- 1;
1474 /* Make sure the crucial bits in the descriptor access
1475 rights are set correctly. Some DPMI providers might barf
1476 if we set the segment limit to something that is not an
1477 integral multiple of 4KB pages if the granularity bit is
1478 not set to byte-granular, even though the DPMI spec says
1479 it's the host's responsibility to set that bit correctly. */
1480 if (len
> 1024 * 1024)
1482 access_rights
|= 0x8000;
1483 /* Page-granular segments should have the low 12 bits of
1485 segment_limit
|= 0xfff;
1488 access_rights
&= ~0x8000;
1490 if (__dpmi_set_segment_base_address (sel
, addr
) != -1
1491 && __dpmi_set_descriptor_access_rights (sel
, access_rights
) != -1
1492 && __dpmi_set_segment_limit (sel
, segment_limit
) != -1
1493 /* W2K silently fails to set the segment limit, leaving
1494 it at zero; this test avoids the resulting crash. */
1495 && __dpmi_get_segment_limit (sel
) >= segment_limit
)
1496 movedata (sel
, 0, _my_ds (), (unsigned)dest
, len
);
1500 __dpmi_free_ldt_descriptor (sel
);
1506 /* Get a segment descriptor stored at index IDX in the descriptor
1507 table whose base address is TABLE_BASE. Return the descriptor
1508 type, or -1 if failure. */
1510 get_descriptor (unsigned long table_base
, int idx
, void *descr
)
1512 unsigned long addr
= table_base
+ idx
* 8; /* 8 bytes per entry */
1514 if (read_memory_region (addr
, descr
, 8))
1515 return (int)((struct seg_descr
*)descr
)->stype
;
1520 unsigned short limit
__attribute__((packed
));
1521 unsigned long base
__attribute__((packed
));
1524 /* Display a segment descriptor stored at index IDX in a descriptor
1525 table whose type is TYPE and whose base address is BASE_ADDR. If
1526 FORCE is non-zero, display even invalid descriptors. */
1528 display_descriptor (unsigned type
, unsigned long base_addr
, int idx
, int force
)
1530 struct seg_descr descr
;
1531 struct gate_descr gate
;
1533 /* Get the descriptor from the table. */
1534 if (idx
== 0 && type
== 0)
1535 puts_filtered ("0x000: null descriptor\n");
1536 else if (get_descriptor (base_addr
, idx
, &descr
) != -1)
1538 /* For each type of descriptor table, this has a bit set if the
1539 corresponding type of selectors is valid in that table. */
1540 static unsigned allowed_descriptors
[] = {
1541 0xffffdafeL
, /* GDT */
1542 0x0000c0e0L
, /* IDT */
1543 0xffffdafaL
/* LDT */
1546 /* If the program hasn't started yet, assume the debuggee will
1547 have the same CPL as the debugger. */
1548 int cpl
= prog_has_started
? (a_tss
.tss_cs
& 3) : _my_cs () & 3;
1549 unsigned long limit
= (descr
.limit1
<< 16) | descr
.limit0
;
1552 && (allowed_descriptors
[type
] & (1 << descr
.stype
)) != 0)
1554 printf_filtered ("0x%03x: ",
1556 ? idx
: (idx
* 8) | (type
? (cpl
| 4) : 0));
1557 if (descr
.page_granular
)
1558 limit
= (limit
<< 12) | 0xfff; /* big segment: low 12 bit set */
1559 if (descr
.stype
== 1 || descr
.stype
== 2 || descr
.stype
== 3
1560 || descr
.stype
== 9 || descr
.stype
== 11
1561 || (descr
.stype
>= 16 && descr
.stype
< 32))
1562 printf_filtered ("base=0x%02x%02x%04x limit=0x%08lx",
1563 descr
.base2
, descr
.base1
, descr
.base0
, limit
);
1565 switch (descr
.stype
)
1569 printf_filtered (" 16-bit TSS (task %sactive)",
1570 descr
.stype
== 3 ? "" : "in");
1573 puts_filtered (" LDT");
1576 memcpy (&gate
, &descr
, sizeof gate
);
1577 printf_filtered ("selector=0x%04x offs=0x%04x%04x",
1578 gate
.selector
, gate
.offset1
, gate
.offset0
);
1579 printf_filtered (" 16-bit Call Gate (params=%d)",
1583 printf_filtered ("TSS selector=0x%04x", descr
.base0
);
1584 printfi_filtered (16, "Task Gate");
1588 memcpy (&gate
, &descr
, sizeof gate
);
1589 printf_filtered ("selector=0x%04x offs=0x%04x%04x",
1590 gate
.selector
, gate
.offset1
, gate
.offset0
);
1591 printf_filtered (" 16-bit %s Gate",
1592 descr
.stype
== 6 ? "Interrupt" : "Trap");
1596 printf_filtered (" 32-bit TSS (task %sactive)",
1597 descr
.stype
== 3 ? "" : "in");
1600 memcpy (&gate
, &descr
, sizeof gate
);
1601 printf_filtered ("selector=0x%04x offs=0x%04x%04x",
1602 gate
.selector
, gate
.offset1
, gate
.offset0
);
1603 printf_filtered (" 32-bit Call Gate (params=%d)",
1608 memcpy (&gate
, &descr
, sizeof gate
);
1609 printf_filtered ("selector=0x%04x offs=0x%04x%04x",
1610 gate
.selector
, gate
.offset1
, gate
.offset0
);
1611 printf_filtered (" 32-bit %s Gate",
1612 descr
.stype
== 14 ? "Interrupt" : "Trap");
1614 case 16: /* data segments */
1622 printf_filtered (" %s-bit Data (%s Exp-%s%s)",
1623 descr
.bit32
? "32" : "16",
1625 ? "Read/Write," : "Read-Only, ",
1626 descr
.stype
& 4 ? "down" : "up",
1627 descr
.stype
& 1 ? "" : ", N.Acc");
1629 case 24: /* code segments */
1637 printf_filtered (" %s-bit Code (%s, %sConf%s)",
1638 descr
.bit32
? "32" : "16",
1639 descr
.stype
& 2 ? "Exec/Read" : "Exec-Only",
1640 descr
.stype
& 4 ? "" : "N.",
1641 descr
.stype
& 1 ? "" : ", N.Acc");
1644 printf_filtered ("Unknown type 0x%02x", descr
.stype
);
1647 puts_filtered ("\n");
1651 printf_filtered ("0x%03x: ",
1653 ? idx
: (idx
* 8) | (type
? (cpl
| 4) : 0));
1655 puts_filtered ("Segment not present\n");
1657 printf_filtered ("Segment type 0x%02x is invalid in this table\n",
1662 printf_filtered ("0x%03x: Cannot read this descriptor\n", idx
);
1666 go32_sldt (char *arg
, int from_tty
)
1668 struct dtr_reg gdtr
;
1669 unsigned short ldtr
= 0;
1671 struct seg_descr ldt_descr
;
1672 long ldt_entry
= -1L;
1673 int cpl
= (prog_has_started
? a_tss
.tss_cs
: _my_cs ()) & 3;
1677 arg
= skip_spaces (arg
);
1681 ldt_entry
= parse_and_eval_long (arg
);
1683 || (ldt_entry
& 4) == 0
1684 || (ldt_entry
& 3) != (cpl
& 3))
1685 error (_("Invalid LDT entry 0x%03lx."), (unsigned long)ldt_entry
);
1689 __asm__
__volatile__ ("sgdt %0" : "=m" (gdtr
) : /* no inputs */ );
1690 __asm__
__volatile__ ("sldt %0" : "=m" (ldtr
) : /* no inputs */ );
1693 puts_filtered ("There is no LDT.\n");
1694 /* LDT's entry in the GDT must have the type LDT, which is 2. */
1695 else if (get_descriptor (gdtr
.base
, ldt_idx
, &ldt_descr
) != 2)
1696 printf_filtered ("LDT is present (at %#x), but unreadable by GDB.\n",
1698 | (ldt_descr
.base1
<< 16)
1699 | (ldt_descr
.base2
<< 24));
1704 | (ldt_descr
.base1
<< 16)
1705 | (ldt_descr
.base2
<< 24);
1706 unsigned limit
= ldt_descr
.limit0
| (ldt_descr
.limit1
<< 16);
1709 if (ldt_descr
.page_granular
)
1710 /* Page-granular segments must have the low 12 bits of their
1712 limit
= (limit
<< 12) | 0xfff;
1713 /* LDT cannot have more than 8K 8-byte entries, i.e. more than
1718 max_entry
= (limit
+ 1) / 8;
1722 if (ldt_entry
> limit
)
1723 error (_("Invalid LDT entry %#lx: outside valid limits [0..%#x]"),
1724 (unsigned long)ldt_entry
, limit
);
1726 display_descriptor (ldt_descr
.stype
, base
, ldt_entry
/ 8, 1);
1732 for (i
= 0; i
< max_entry
; i
++)
1733 display_descriptor (ldt_descr
.stype
, base
, i
, 0);
1739 go32_sgdt (char *arg
, int from_tty
)
1741 struct dtr_reg gdtr
;
1742 long gdt_entry
= -1L;
1747 arg
= skip_spaces (arg
);
1751 gdt_entry
= parse_and_eval_long (arg
);
1752 if (gdt_entry
< 0 || (gdt_entry
& 7) != 0)
1753 error (_("Invalid GDT entry 0x%03lx: "
1754 "not an integral multiple of 8."),
1755 (unsigned long)gdt_entry
);
1759 __asm__
__volatile__ ("sgdt %0" : "=m" (gdtr
) : /* no inputs */ );
1760 max_entry
= (gdtr
.limit
+ 1) / 8;
1764 if (gdt_entry
> gdtr
.limit
)
1765 error (_("Invalid GDT entry %#lx: outside valid limits [0..%#x]"),
1766 (unsigned long)gdt_entry
, gdtr
.limit
);
1768 display_descriptor (0, gdtr
.base
, gdt_entry
/ 8, 1);
1774 for (i
= 0; i
< max_entry
; i
++)
1775 display_descriptor (0, gdtr
.base
, i
, 0);
1780 go32_sidt (char *arg
, int from_tty
)
1782 struct dtr_reg idtr
;
1783 long idt_entry
= -1L;
1788 arg
= skip_spaces (arg
);
1792 idt_entry
= parse_and_eval_long (arg
);
1794 error (_("Invalid (negative) IDT entry %ld."), idt_entry
);
1798 __asm__
__volatile__ ("sidt %0" : "=m" (idtr
) : /* no inputs */ );
1799 max_entry
= (idtr
.limit
+ 1) / 8;
1800 if (max_entry
> 0x100) /* No more than 256 entries. */
1805 if (idt_entry
> idtr
.limit
)
1806 error (_("Invalid IDT entry %#lx: outside valid limits [0..%#x]"),
1807 (unsigned long)idt_entry
, idtr
.limit
);
1809 display_descriptor (1, idtr
.base
, idt_entry
, 1);
1815 for (i
= 0; i
< max_entry
; i
++)
1816 display_descriptor (1, idtr
.base
, i
, 0);
1820 /* Cached linear address of the base of the page directory. For
1821 now, available only under CWSDPMI. Code based on ideas and
1822 suggestions from Charles Sandmann <sandmann@clio.rice.edu>. */
1823 static unsigned long pdbr
;
1825 static unsigned long
1830 unsigned long taskbase
, cr3
;
1831 struct dtr_reg gdtr
;
1833 if (pdbr
> 0 && pdbr
<= 0xfffff)
1836 /* Get the linear address of GDT and the Task Register. */
1837 __asm__
__volatile__ ("sgdt %0" : "=m" (gdtr
) : /* no inputs */ );
1838 __asm__
__volatile__ ("str %0" : "=m" (taskreg
) : /* no inputs */ );
1840 /* Task Register is a segment selector for the TSS of the current
1841 task. Therefore, it can be used as an index into the GDT to get
1842 at the segment descriptor for the TSS. To get the index, reset
1843 the low 3 bits of the selector (which give the CPL). Add 2 to the
1844 offset to point to the 3 low bytes of the base address. */
1845 offset
= gdtr
.base
+ (taskreg
& 0xfff8) + 2;
1848 /* CWSDPMI's task base is always under the 1MB mark. */
1849 if (offset
> 0xfffff)
1852 _farsetsel (_dos_ds
);
1853 taskbase
= _farnspeekl (offset
) & 0xffffffU
;
1854 taskbase
+= _farnspeekl (offset
+ 2) & 0xff000000U
;
1855 if (taskbase
> 0xfffff)
1858 /* CR3 (a.k.a. PDBR, the Page Directory Base Register) is stored at
1859 offset 1Ch in the TSS. */
1860 cr3
= _farnspeekl (taskbase
+ 0x1c) & ~0xfff;
1863 #if 0 /* Not fullly supported yet. */
1864 /* The Page Directory is in UMBs. In that case, CWSDPMI puts
1865 the first Page Table right below the Page Directory. Thus,
1866 the first Page Table's entry for its own address and the Page
1867 Directory entry for that Page Table will hold the same
1868 physical address. The loop below searches the entire UMB
1869 range of addresses for such an occurence. */
1870 unsigned long addr
, pte_idx
;
1872 for (addr
= 0xb0000, pte_idx
= 0xb0;
1874 addr
+= 0x1000, pte_idx
++)
1876 if (((_farnspeekl (addr
+ 4 * pte_idx
) & 0xfffff027) ==
1877 (_farnspeekl (addr
+ 0x1000) & 0xfffff027))
1878 && ((_farnspeekl (addr
+ 4 * pte_idx
+ 4) & 0xfffff000) == cr3
))
1880 cr3
= addr
+ 0x1000;
1893 /* Return the N'th Page Directory entry. */
1894 static unsigned long
1897 unsigned long pde
= 0;
1899 if (pdbr
&& n
>= 0 && n
< 1024)
1901 pde
= _farpeekl (_dos_ds
, pdbr
+ 4*n
);
1906 /* Return the N'th entry of the Page Table whose Page Directory entry
1908 static unsigned long
1909 get_pte (unsigned long pde
, int n
)
1911 unsigned long pte
= 0;
1913 /* pde & 0x80 tests the 4MB page bit. We don't support 4MB
1914 page tables, for now. */
1915 if ((pde
& 1) && !(pde
& 0x80) && n
>= 0 && n
< 1024)
1917 pde
&= ~0xfff; /* Clear non-address bits. */
1918 pte
= _farpeekl (_dos_ds
, pde
+ 4*n
);
1923 /* Display a Page Directory or Page Table entry. IS_DIR, if non-zero,
1924 says this is a Page Directory entry. If FORCE is non-zero, display
1925 the entry even if its Present flag is off. OFF is the offset of the
1926 address from the page's base address. */
1928 display_ptable_entry (unsigned long entry
, int is_dir
, int force
, unsigned off
)
1930 if ((entry
& 1) != 0)
1932 printf_filtered ("Base=0x%05lx000", entry
>> 12);
1933 if ((entry
& 0x100) && !is_dir
)
1934 puts_filtered (" Global");
1935 if ((entry
& 0x40) && !is_dir
)
1936 puts_filtered (" Dirty");
1937 printf_filtered (" %sAcc.", (entry
& 0x20) ? "" : "Not-");
1938 printf_filtered (" %sCached", (entry
& 0x10) ? "" : "Not-");
1939 printf_filtered (" Write-%s", (entry
& 8) ? "Thru" : "Back");
1940 printf_filtered (" %s", (entry
& 4) ? "Usr" : "Sup");
1941 printf_filtered (" Read-%s", (entry
& 2) ? "Write" : "Only");
1943 printf_filtered (" +0x%x", off
);
1944 puts_filtered ("\n");
1947 printf_filtered ("Page%s not present or not supported; value=0x%lx.\n",
1948 is_dir
? " Table" : "", entry
>> 1);
1952 go32_pde (char *arg
, int from_tty
)
1954 long pde_idx
= -1, i
;
1958 arg
= skip_spaces (arg
);
1962 pde_idx
= parse_and_eval_long (arg
);
1963 if (pde_idx
< 0 || pde_idx
>= 1024)
1964 error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx
);
1970 puts_filtered ("Access to Page Directories is "
1971 "not supported on this system.\n");
1972 else if (pde_idx
>= 0)
1973 display_ptable_entry (get_pde (pde_idx
), 1, 1, 0);
1975 for (i
= 0; i
< 1024; i
++)
1976 display_ptable_entry (get_pde (i
), 1, 0, 0);
1979 /* A helper function to display entries in a Page Table pointed to by
1980 the N'th entry in the Page Directory. If FORCE is non-zero, say
1981 something even if the Page Table is not accessible. */
1983 display_page_table (long n
, int force
)
1985 unsigned long pde
= get_pde (n
);
1991 printf_filtered ("Page Table pointed to by "
1992 "Page Directory entry 0x%lx:\n", n
);
1993 for (i
= 0; i
< 1024; i
++)
1994 display_ptable_entry (get_pte (pde
, i
), 0, 0, 0);
1995 puts_filtered ("\n");
1998 printf_filtered ("Page Table not present; value=0x%lx.\n", pde
>> 1);
2002 go32_pte (char *arg
, int from_tty
)
2004 long pde_idx
= -1L, i
;
2008 arg
= skip_spaces (arg
);
2012 pde_idx
= parse_and_eval_long (arg
);
2013 if (pde_idx
< 0 || pde_idx
>= 1024)
2014 error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx
);
2020 puts_filtered ("Access to Page Tables is not supported on this system.\n");
2021 else if (pde_idx
>= 0)
2022 display_page_table (pde_idx
, 1);
2024 for (i
= 0; i
< 1024; i
++)
2025 display_page_table (i
, 0);
2029 go32_pte_for_address (char *arg
, int from_tty
)
2031 CORE_ADDR addr
= 0, i
;
2035 arg
= skip_spaces (arg
);
2038 addr
= parse_and_eval_address (arg
);
2041 error_no_arg (_("linear address"));
2045 puts_filtered ("Access to Page Tables is not supported on this system.\n");
2048 int pde_idx
= (addr
>> 22) & 0x3ff;
2049 int pte_idx
= (addr
>> 12) & 0x3ff;
2050 unsigned offs
= addr
& 0xfff;
2052 printf_filtered ("Page Table entry for address %s:\n",
2054 display_ptable_entry (get_pte (get_pde (pde_idx
), pte_idx
), 0, 1, offs
);
2058 static struct cmd_list_element
*info_dos_cmdlist
= NULL
;
2061 go32_info_dos_command (char *args
, int from_tty
)
2063 help_list (info_dos_cmdlist
, "info dos ", class_info
, gdb_stdout
);
2066 /* -Wmissing-prototypes */
2067 extern initialize_file_ftype _initialize_go32_nat
;
2070 _initialize_go32_nat (void)
2072 struct target_ops
*t
= go32_target ();
2074 i386_dr_low
.set_control
= go32_set_dr7
;
2075 i386_dr_low
.set_addr
= go32_set_dr
;
2076 i386_dr_low
.get_status
= go32_get_dr6
;
2077 i386_dr_low
.get_control
= go32_get_dr7
;
2078 i386_dr_low
.get_addr
= go32_get_dr
;
2079 i386_set_debug_register_length (4);
2081 i386_use_watchpoints (t
);
2084 /* Initialize child's cwd as empty to be initialized when starting
2088 /* Initialize child's command line storage. */
2089 if (redir_debug_init (&child_cmd
) == -1)
2090 internal_error (__FILE__
, __LINE__
,
2091 _("Cannot allocate redirection storage: "
2092 "not enough memory.\n"));
2094 /* We are always processing GCC-compiled programs. */
2095 processing_gcc_compilation
= 2;
2097 add_prefix_cmd ("dos", class_info
, go32_info_dos_command
, _("\
2098 Print information specific to DJGPP (aka MS-DOS) debugging."),
2099 &info_dos_cmdlist
, "info dos ", 0, &infolist
);
2101 add_cmd ("sysinfo", class_info
, go32_sysinfo
, _("\
2102 Display information about the target system, including CPU, OS, DPMI, etc."),
2104 add_cmd ("ldt", class_info
, go32_sldt
, _("\
2105 Display entries in the LDT (Local Descriptor Table).\n\
2106 Entry number (an expression) as an argument means display only that entry."),
2108 add_cmd ("gdt", class_info
, go32_sgdt
, _("\
2109 Display entries in the GDT (Global Descriptor Table).\n\
2110 Entry number (an expression) as an argument means display only that entry."),
2112 add_cmd ("idt", class_info
, go32_sidt
, _("\
2113 Display entries in the IDT (Interrupt Descriptor Table).\n\
2114 Entry number (an expression) as an argument means display only that entry."),
2116 add_cmd ("pde", class_info
, go32_pde
, _("\
2117 Display entries in the Page Directory.\n\
2118 Entry number (an expression) as an argument means display only that entry."),
2120 add_cmd ("pte", class_info
, go32_pte
, _("\
2121 Display entries in Page Tables.\n\
2122 Entry number (an expression) as an argument means display only entries\n\
2123 from the Page Table pointed to by the specified Page Directory entry."),
2125 add_cmd ("address-pte", class_info
, go32_pte_for_address
, _("\
2126 Display a Page Table entry for a linear address.\n\
2127 The address argument must be a linear address, after adding to\n\
2128 it the base address of the appropriate segment.\n\
2129 The base address of variables and functions in the debuggee's data\n\
2130 or code segment is stored in the variable __djgpp_base_address,\n\
2131 so use `__djgpp_base_address + (char *)&var' as the argument.\n\
2132 For other segments, look up their base address in the output of\n\
2133 the `info dos ldt' command."),
2147 tcsetpgrp (int fd
, pid_t pgid
)
2149 if (isatty (fd
) && pgid
== SOME_PID
)
2151 errno
= pgid
== SOME_PID
? ENOTTY
: ENOSYS
;