/* Native debugging support for Intel x86 running DJGPP.
- Copyright 1997, 1999 Free Software Foundation, Inc.
+ Copyright (C) 1997-2019 Free Software Foundation, Inc.
Written by Robert Hoehne.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* To whomever it may concern, here's a general description of how
+ debugging in DJGPP works, and the special quirks GDB does to
+ support that.
+
+ When the DJGPP port of GDB is debugging a DJGPP program natively,
+ there aren't 2 separate processes, the debuggee and GDB itself, as
+ on other systems. (This is DOS, where there can only be one active
+ process at any given time, remember?) Instead, GDB and the
+ debuggee live in the same process. So when GDB calls
+ go32_create_inferior below, and that function calls edi_init from
+ the DJGPP debug support library libdbg.a, we load the debuggee's
+ executable file into GDB's address space, set it up for execution
+ as the stub loader (a short real-mode program prepended to each
+ DJGPP executable) normally would, and do a lot of preparations for
+ swapping between GDB's and debuggee's internal state, primarily wrt
+ the exception handlers. This swapping happens every time we resume
+ the debuggee or switch back to GDB's code, and it includes:
+
+ . swapping all the segment registers
+ . swapping the PSP (the Program Segment Prefix)
+ . swapping the signal handlers
+ . swapping the exception handlers
+ . swapping the FPU status
+ . swapping the 3 standard file handles (more about this below)
+
+ Then running the debuggee simply means longjmp into it where its PC
+ is and let it run until it stops for some reason. When it stops,
+ GDB catches the exception that stopped it and longjmp's back into
+ its own code. All the possible exit points of the debuggee are
+ watched; for example, the normal exit point is recognized because a
+ DOS program issues a special system call to exit. If one of those
+ exit points is hit, we mourn the inferior and clean up after it.
+ Cleaning up is very important, even if the process exits normally,
+ because otherwise we might leave behind traces of previous
+ execution, and in several cases GDB itself might be left hosed,
+ because all the exception handlers were not restored.
+
+ Swapping of the standard handles (in redir_to_child and
+ redir_to_debugger) is needed because, since both GDB and the
+ debuggee live in the same process, as far as the OS is concerned,
+ the share the same file table. This means that the standard
+ handles 0, 1, and 2 point to the same file table entries, and thus
+ are connected to the same devices. Therefore, if the debugger
+ redirects its standard output, the standard output of the debuggee
+ is also automagically redirected to the same file/device!
+ Similarly, if the debuggee redirects its stdout to a file, you
+ won't be able to see debugger's output (it will go to the same file
+ where the debuggee has its output); and if the debuggee closes its
+ standard input, you will lose the ability to talk to debugger!
+
+ For this reason, every time the debuggee is about to be resumed, we
+ call redir_to_child, which redirects the standard handles to where
+ the debuggee expects them to be. When the debuggee stops and GDB
+ regains control, we call redir_to_debugger, which redirects those 3
+ handles back to where GDB expects.
+
+ Note that only the first 3 handles are swapped, so if the debuggee
+ redirects or closes any other handles, GDB will not notice. In
+ particular, the exit code of a DJGPP program forcibly closes all
+ file handles beyond the first 3 ones, so when the debuggee exits,
+ GDB currently loses its stdaux and stdprn streams. Fortunately,
+ GDB does not use those as of this writing, and will never need
+ to. */
+
+#include "defs.h"
#include <fcntl.h>
-#include "defs.h"
-#include "frame.h" /* required by inferior.h */
+#include "x86-nat.h"
#include "inferior.h"
-#include "target.h"
-#include "gdb_wait.h"
+#include "infrun.h"
+#include "gdbthread.h"
+#include "gdbsupport/gdb_wait.h"
#include "gdbcore.h"
#include "command.h"
+#include "gdbcmd.h"
#include "floatformat.h"
-
-#include <stdio.h> /* required for __DJGPP_MINOR__ */
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
+#include "buildsym-legacy.h"
+#include "i387-tdep.h"
+#include "i386-tdep.h"
+#include "nat/x86-cpuid.h"
+#include "value.h"
+#include "regcache.h"
+#include "top.h"
+#include "cli/cli-utils.h"
+#include "inf-child.h"
+
+#include <ctype.h>
#include <unistd.h>
+#include <sys/utsname.h>
#include <io.h>
+#include <dos.h>
#include <dpmi.h>
+#include <go32.h>
+#include <sys/farptr.h>
#include <debug/v2load.h>
#include <debug/dbgcom.h>
#if __DJGPP_MINOR__ > 2
#include <debug/redir.h>
#endif
+#include <langinfo.h>
+
#if __DJGPP_MINOR__ < 3
-/* This code will be provided from DJGPP 2.03 on. Until then I code it
- here */
+/* This code will be provided from DJGPP 2.03 on. Until then I code it
+ here. */
typedef struct
{
unsigned short sig0;
static NPX npx;
-static void save_npx (void); /* Save the FPU of the debugged program */
-static void load_npx (void); /* Restore the FPU of the debugged program */
+static void save_npx (void); /* Save the FPU of the debugged program. */
+static void load_npx (void); /* Restore the FPU of the debugged program. */
/* ------------------------------------------------------------------------- */
/* Store the contents of the NPX in the global variable `npx'. */
static void
save_npx (void)
{
- asm ("inb $0xa0, %%al
- testb $0x20, %%al
- jz 1f
- xorb %% al, %%al
- outb %% al, $0xf0
- movb $0x20, %%al
- outb %% al, $0xa0
- outb %% al, $0x20
-1:
- fnsave % 0
+ asm ("inb $0xa0, %%al \n\
+ testb $0x20, %%al \n\
+ jz 1f \n\
+ xorb %%al, %%al \n\
+ outb %%al, $0xf0 \n\
+ movb $0x20, %%al \n\
+ outb %%al, $0xa0 \n\
+ outb %%al, $0x20 \n\
+1: \n\
+ fnsave %0 \n\
fwait "
: "=m" (npx)
: /* No input */
/* *INDENT-ON* */
-
-
-
/* ------------------------------------------------------------------------- */
/* Reload the contents of the NPX from the global variable `npx'. */
static void
load_npx (void)
{
-asm ("frstor %0":"=m" (npx));
+ asm ("frstor %0":"=m" (npx));
}
/* ------------------------------------------------------------------------- */
/* Stubs for the missing redirection functions. */
int redirected;
} cmdline_t;
-void redir_cmdline_delete (cmdline_t *ptr) {ptr->redirected = 0;}
-int redir_cmdline_parse (const char *args, cmdline_t *ptr)
+void
+redir_cmdline_delete (cmdline_t *ptr)
+{
+ ptr->redirected = 0;
+}
+
+int
+redir_cmdline_parse (const char *args, cmdline_t *ptr)
{
return -1;
}
-int redir_to_child (cmdline_t *ptr)
+
+int
+redir_to_child (cmdline_t *ptr)
{
return 1;
}
-int redir_to_debugger (cmdline_t *ptr)
+
+int
+redir_to_debugger (cmdline_t *ptr)
{
return 1;
}
-int redir_debug_init (cmdline_t *ptr) { return 0; }
-#endif /* __DJGPP_MINOR < 3 */
-extern void _initialize_go32_nat (void);
-
-struct env387
- {
- unsigned short control;
- unsigned short r0;
- unsigned short status;
- unsigned short r1;
- unsigned short tag;
- unsigned short r2;
- unsigned long eip;
- unsigned short code_seg;
- unsigned short opcode;
- unsigned long operand;
- unsigned short operand_seg;
- unsigned short r3;
- unsigned char regs[8][10];
- };
+int
+redir_debug_init (cmdline_t *ptr)
+{
+ return 0;
+}
+#endif /* __DJGPP_MINOR < 3 */
typedef enum { wp_insert, wp_remove, wp_count } wp_op;
/* This holds the current reference counts for each debug register. */
static int dr_ref_count[4];
-extern char **environ;
-
#define SOME_PID 42
static int prog_has_started = 0;
-static void print_387_status (unsigned short status, struct env387 *ep);
-static void go32_open (char *name, int from_tty);
-static void go32_close (int quitting);
-static void go32_attach (char *args, int from_tty);
-static void go32_detach (char *args, int from_tty);
-static void go32_resume (int pid, int step, enum target_signal siggnal);
-static int go32_wait (int pid, struct target_waitstatus *status);
-static void go32_fetch_registers (int regno);
-static void store_register (int regno);
-static void go32_store_registers (int regno);
-static void go32_prepare_to_store (void);
-static int go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len,
- int write, struct target_ops *target);
-static void go32_files_info (struct target_ops *target);
-static void go32_stop (void);
-static void go32_kill_inferior (void);
-static void go32_create_inferior (char *exec_file, char *args, char **env);
-static void cleanup_dregs (void);
-static void go32_mourn_inferior (void);
-static int go32_can_run (void);
-static void ignore (void);
-static void ignore2 (char *a, int b);
-static int go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr,
- int len, int rw);
-static int go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr,
- int len, int rw);
-static int go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr,
- CORE_ADDR addr, int len, int rw);
-
-static struct target_ops go32_ops;
-static void go32_terminal_init (void);
-static void go32_terminal_inferior (void);
-static void go32_terminal_ours (void);
-
-static void
-print_387_status (unsigned short status, struct env387 *ep)
-{
- int i;
- int bothstatus;
- int top;
- int fpreg;
-
- bothstatus = ((status != 0) && (ep->status != 0));
- if (status != 0)
- {
- if (bothstatus)
- printf_unfiltered ("u: ");
- print_387_status_word (status);
- }
-
- if (ep->status != 0)
- {
- if (bothstatus)
- printf_unfiltered ("e: ");
- print_387_status_word (ep->status);
- }
-
- print_387_control_word (ep->control & 0xffff);
- /* Other platforms say "last exception", but that's not true: the
- FPU stores the last non-control instruction there. */
- printf_unfiltered ("last FP instruction: ");
- /* The ORing with D800h restores the upper 5 bits of the opcode that
- are not stored by the FPU (since these bits are the same for all
- floating-point instructions). */
- printf_unfiltered ("opcode %s; ",
- local_hex_string (ep->opcode ? (ep->opcode|0xd800) : 0));
- printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));
- printf_unfiltered ("%s; ", local_hex_string (ep->eip));
- printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));
- printf_unfiltered (":%s\n", local_hex_string (ep->operand));
-
- top = (ep->status >> 11) & 7;
-
- printf_unfiltered ("regno tag msb lsb value\n");
- for (fpreg = 7; fpreg >= 0; fpreg--)
- {
- /* FNSAVE saves the FP registers in their logical TOP-relative
- order, beginning with ST(0). Since we need to print them in
- their physical order, we have to remap them. */
- int regno = fpreg - top;
- long double val;
-
- if (regno < 0)
- regno += 8;
-
- printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
-
- switch ((ep->tag >> (fpreg * 2)) & 3)
- {
- case 0:
- printf_unfiltered ("valid ");
- break;
- case 1:
- printf_unfiltered ("zero ");
- break;
- case 2:
- /* All other versions of print_387_status use TRAP here, but I
- think this is misleading, since Intel manuals say SPECIAL. */
- printf_unfiltered ("special ");
- break;
- case 3:
- printf_unfiltered ("empty ");
- break;
- }
- for (i = 9; i >= 0; i--)
- printf_unfiltered ("%02x", ep->regs[regno][i]);
-
- REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM+regno, builtin_type_long_double,
- &ep->regs[regno], &val);
-
- printf_unfiltered (" %.19LG\n", val);
- }
-}
-
-void
-i386_go32_float_info (void)
-{
- print_387_status (0, (struct env387 *) &npx);
-}
#define r_ofs(x) (offsetof(TSS,x))
}
regno_mapping[] =
{
- r_ofs (tss_eax), 4, /* normal registers, from a_tss */
- r_ofs (tss_ecx), 4,
- r_ofs (tss_edx), 4,
- r_ofs (tss_ebx), 4,
- r_ofs (tss_esp), 4,
- r_ofs (tss_ebp), 4,
- r_ofs (tss_esi), 4,
- r_ofs (tss_edi), 4,
- r_ofs (tss_eip), 4,
- r_ofs (tss_eflags), 4,
- r_ofs (tss_cs), 2,
- r_ofs (tss_ss), 2,
- r_ofs (tss_ds), 2,
- r_ofs (tss_es), 2,
- r_ofs (tss_fs), 2,
- r_ofs (tss_gs), 2,
- 0, 10, /* 8 FP registers, from npx.reg[] */
- 1, 10,
- 2, 10,
- 3, 10,
- 4, 10,
- 5, 10,
- 6, 10,
- 7, 10,
+ {r_ofs (tss_eax), 4}, /* normal registers, from a_tss */
+ {r_ofs (tss_ecx), 4},
+ {r_ofs (tss_edx), 4},
+ {r_ofs (tss_ebx), 4},
+ {r_ofs (tss_esp), 4},
+ {r_ofs (tss_ebp), 4},
+ {r_ofs (tss_esi), 4},
+ {r_ofs (tss_edi), 4},
+ {r_ofs (tss_eip), 4},
+ {r_ofs (tss_eflags), 4},
+ {r_ofs (tss_cs), 2},
+ {r_ofs (tss_ss), 2},
+ {r_ofs (tss_ds), 2},
+ {r_ofs (tss_es), 2},
+ {r_ofs (tss_fs), 2},
+ {r_ofs (tss_gs), 2},
+ {0, 10}, /* 8 FP registers, from npx.reg[] */
+ {1, 10},
+ {2, 10},
+ {3, 10},
+ {4, 10},
+ {5, 10},
+ {6, 10},
+ {7, 10},
/* The order of the next 7 registers must be consistent
- with their numbering in config/i386/tm-go32.h, which see. */
- 0, 2, /* control word, from npx */
- 4, 2, /* status word, from npx */
- 8, 2, /* tag word, from npx */
- 16, 2, /* last FP exception CS from npx */
- 24, 2, /* last FP exception operand selector from npx */
- 12, 4, /* last FP exception EIP from npx */
- 20, 4 /* last FP exception operand offset from npx */
+ with their numbering in config/i386/tm-i386.h, which see. */
+ {0, 2}, /* control word, from npx */
+ {4, 2}, /* status word, from npx */
+ {8, 2}, /* tag word, from npx */
+ {16, 2}, /* last FP exception CS from npx */
+ {12, 4}, /* last FP exception EIP from npx */
+ {24, 2}, /* last FP exception operand selector from npx */
+ {20, 4}, /* last FP exception operand offset from npx */
+ {18, 2} /* last FP opcode from npx */
};
static struct
{
int go32_sig;
- int gdb_sig;
+ enum gdb_signal gdb_sig;
}
sig_map[] =
{
- 0, TARGET_SIGNAL_FPE,
- 1, TARGET_SIGNAL_TRAP,
+ {0, GDB_SIGNAL_FPE},
+ {1, GDB_SIGNAL_TRAP},
/* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL,
but I think SIGBUS is better, since the NMI is usually activated
as a result of a memory parity check failure. */
- 2, TARGET_SIGNAL_BUS,
- 3, TARGET_SIGNAL_TRAP,
- 4, TARGET_SIGNAL_FPE,
- 5, TARGET_SIGNAL_SEGV,
- 6, TARGET_SIGNAL_ILL,
- 7, TARGET_SIGNAL_EMT, /* no-coprocessor exception */
- 8, TARGET_SIGNAL_SEGV,
- 9, TARGET_SIGNAL_SEGV,
- 10, TARGET_SIGNAL_BUS,
- 11, TARGET_SIGNAL_SEGV,
- 12, TARGET_SIGNAL_SEGV,
- 13, TARGET_SIGNAL_SEGV,
- 14, TARGET_SIGNAL_SEGV,
- 16, TARGET_SIGNAL_FPE,
- 17, TARGET_SIGNAL_BUS,
- 31, TARGET_SIGNAL_ILL,
- 0x1b, TARGET_SIGNAL_INT,
- 0x75, TARGET_SIGNAL_FPE,
- 0x78, TARGET_SIGNAL_ALRM,
- 0x79, TARGET_SIGNAL_INT,
- 0x7a, TARGET_SIGNAL_QUIT,
- -1, -1
+ {2, GDB_SIGNAL_BUS},
+ {3, GDB_SIGNAL_TRAP},
+ {4, GDB_SIGNAL_FPE},
+ {5, GDB_SIGNAL_SEGV},
+ {6, GDB_SIGNAL_ILL},
+ {7, GDB_SIGNAL_EMT}, /* no-coprocessor exception */
+ {8, GDB_SIGNAL_SEGV},
+ {9, GDB_SIGNAL_SEGV},
+ {10, GDB_SIGNAL_BUS},
+ {11, GDB_SIGNAL_SEGV},
+ {12, GDB_SIGNAL_SEGV},
+ {13, GDB_SIGNAL_SEGV},
+ {14, GDB_SIGNAL_SEGV},
+ {16, GDB_SIGNAL_FPE},
+ {17, GDB_SIGNAL_BUS},
+ {31, GDB_SIGNAL_ILL},
+ {0x1b, GDB_SIGNAL_INT},
+ {0x75, GDB_SIGNAL_FPE},
+ {0x78, GDB_SIGNAL_ALRM},
+ {0x79, GDB_SIGNAL_INT},
+ {0x7a, GDB_SIGNAL_QUIT},
+ {-1, GDB_SIGNAL_LAST}
};
static struct {
- enum target_signal gdb_sig;
+ enum gdb_signal gdb_sig;
int djgpp_excepno;
} excepn_map[] = {
- TARGET_SIGNAL_0, -1,
- TARGET_SIGNAL_ILL, 6, /* Invalid Opcode */
- TARGET_SIGNAL_EMT, 7, /* triggers SIGNOFP */
- TARGET_SIGNAL_SEGV, 13, /* GPF */
- TARGET_SIGNAL_BUS, 17, /* Alignment Check */
+ {GDB_SIGNAL_0, -1},
+ {GDB_SIGNAL_ILL, 6}, /* Invalid Opcode */
+ {GDB_SIGNAL_EMT, 7}, /* triggers SIGNOFP */
+ {GDB_SIGNAL_SEGV, 13}, /* GPF */
+ {GDB_SIGNAL_BUS, 17}, /* Alignment Check */
/* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for
details. */
- TARGET_SIGNAL_TERM, 0x1b, /* triggers Ctrl-Break type of SIGINT */
- TARGET_SIGNAL_FPE, 0x75,
- TARGET_SIGNAL_INT, 0x79,
- TARGET_SIGNAL_QUIT, 0x7a,
- TARGET_SIGNAL_ALRM, 0x78, /* triggers SIGTIMR */
- TARGET_SIGNAL_PROF, 0x78,
- -1, -1
+ {GDB_SIGNAL_TERM, 0x1b}, /* triggers Ctrl-Break type of SIGINT */
+ {GDB_SIGNAL_FPE, 0x75},
+ {GDB_SIGNAL_INT, 0x79},
+ {GDB_SIGNAL_QUIT, 0x7a},
+ {GDB_SIGNAL_ALRM, 0x78}, /* triggers SIGTIMR */
+ {GDB_SIGNAL_PROF, 0x78},
+ {GDB_SIGNAL_LAST, -1}
};
-static void
-go32_open (char *name, int from_tty)
-{
- printf_unfiltered ("Done. Use the \"run\" command to run the program.\n");
-}
+/* The go32 target. */
-static void
-go32_close (int quitting)
+struct go32_nat_target final : public x86_nat_target<inf_child_target>
{
-}
+ void attach (const char *, int) override;
-static void
-go32_attach (char *args, int from_tty)
-{
- error ("\
-You cannot attach to a running program on this platform.\n\
-Use the `run' command to run DJGPP programs.");
-}
+ void resume (ptid_t, int, enum gdb_signal) override;
-static void
-go32_detach (char *args, int from_tty)
+ ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
+
+ void fetch_registers (struct regcache *, int) override;
+ void store_registers (struct regcache *, int) override;
+
+ enum target_xfer_status xfer_partial (enum target_object object,
+ const char *annex,
+ gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST offset, ULONGEST len,
+ ULONGEST *xfered_len) override;
+
+ void files_info () override;
+
+ void terminal_init () override;
+
+ void terminal_inferior () override;
+
+ void terminal_ours_for_output () override;
+
+ void terminal_ours () override;
+
+ void terminal_info (const char *, int) override;
+
+ void pass_ctrlc () override;
+
+ void kill () override;
+
+ void create_inferior (const char *, const std::string &,
+ char **, int) override;
+
+ void mourn_inferior () override;
+
+ bool thread_alive (ptid_t ptid) override;
+
+ std::string pid_to_str (ptid_t) override;
+};
+
+static go32_nat_target the_go32_nat_target;
+
+void
+go32_nat_target::attach (const char *args, int from_tty)
{
+ error (_("\
+You cannot attach to a running program on this platform.\n\
+Use the `run' command to run DJGPP programs."));
}
static int resume_is_step;
static int resume_signal = -1;
-static void
-go32_resume (int pid, int step, enum target_signal siggnal)
+void
+go32_nat_target::resume (ptid_t ptid, int step, enum gdb_signal siggnal)
{
int i;
resume_is_step = step;
- if (siggnal != TARGET_SIGNAL_0 && siggnal != TARGET_SIGNAL_TRAP)
+ if (siggnal != GDB_SIGNAL_0 && siggnal != GDB_SIGNAL_TRAP)
{
- for (i = 0, resume_signal = -1; excepn_map[i].gdb_sig != -1; i++)
+ for (i = 0, resume_signal = -1;
+ excepn_map[i].gdb_sig != GDB_SIGNAL_LAST; i++)
if (excepn_map[i].gdb_sig == siggnal)
{
resume_signal = excepn_map[i].djgpp_excepno;
}
if (resume_signal == -1)
printf_unfiltered ("Cannot deliver signal %s on this platform.\n",
- target_signal_to_name (siggnal));
+ gdb_signal_to_name (siggnal));
}
}
static char child_cwd[FILENAME_MAX];
-static int
-go32_wait (int pid, struct target_waitstatus *status)
+ptid_t
+go32_nat_target::wait (ptid_t ptid, struct target_waitstatus *status,
+ int options)
{
int i;
unsigned char saved_opcode;
- unsigned long INT3_addr;
+ unsigned long INT3_addr = 0;
int stepping_over_INT = 0;
- a_tss.tss_eflags &= 0xfeff; /* reset the single-step flag (TF) */
+ a_tss.tss_eflags &= 0xfeff; /* Reset the single-step flag (TF). */
if (resume_is_step)
{
/* If the next instruction is INT xx or INTO, we need to handle
}
else
{
- a_tss.tss_trap = 0xffff; /* run_child looks for this */
+ a_tss.tss_trap = 0xffff; /* run_child looks for this. */
a_tss.tss_irqn = resume_signal;
}
point of changing back to where GDB thinks is its cwd, when we
return control to the debugger, but restore child's cwd before we
run it. */
+ /* Initialize child_cwd, before the first call to run_child and not
+ in the initialization, so the child get also the changed directory
+ set with the gdb-command "cd ..." */
+ if (!*child_cwd)
+ /* Initialize child's cwd with the current one. */
+ getcwd (child_cwd, sizeof (child_cwd));
+
chdir (child_cwd);
#if __DJGPP_MINOR__ < 3
if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1)
{
/* Restore the original opcode. */
- a_tss.tss_eip--; /* EIP points *after* the INT3 instruction */
+ a_tss.tss_eip--; /* EIP points *after* the INT3 instruction. */
write_child (a_tss.tss_eip, &saved_opcode, 1);
/* Simulate a TRAP exception. */
a_tss.tss_irqn = 1;
}
getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */
- chdir (current_directory);
+ if (current_directory != NULL)
+ chdir (current_directory);
if (a_tss.tss_irqn == 0x21)
{
}
else
{
- status->value.sig = TARGET_SIGNAL_UNKNOWN;
+ status->value.sig = GDB_SIGNAL_UNKNOWN;
status->kind = TARGET_WAITKIND_STOPPED;
for (i = 0; sig_map[i].go32_sig != -1; i++)
{
{
#if __DJGPP_MINOR__ < 3
if ((status->value.sig = sig_map[i].gdb_sig) !=
- TARGET_SIGNAL_TRAP)
+ GDB_SIGNAL_TRAP)
status->kind = TARGET_WAITKIND_SIGNALLED;
#else
status->value.sig = sig_map[i].gdb_sig;
}
}
}
- return SOME_PID;
+ return ptid_t (SOME_PID);
}
static void
-go32_fetch_registers (int regno)
+fetch_register (struct regcache *regcache, int regno)
{
- /*JHW */
- int end_reg = regno + 1; /* just one reg initially */
-
- if (regno < 0) /* do the all registers */
- {
- regno = 0; /* start at first register */
- /* # regs in table */
- end_reg = sizeof (regno_mapping) / sizeof (regno_mapping[0]);
- }
+ struct gdbarch *gdbarch = regcache->arch ();
+ if (regno < gdbarch_fp0_regnum (gdbarch))
+ regcache->raw_supply (regno,
+ (char *) &a_tss + regno_mapping[regno].tss_ofs);
+ else if (i386_fp_regnum_p (gdbarch, regno) || i386_fpc_regnum_p (gdbarch,
+ regno))
+ i387_supply_fsave (regcache, regno, &npx);
+ else
+ internal_error (__FILE__, __LINE__,
+ _("Invalid register no. %d in fetch_register."), regno);
+}
- for (; regno < end_reg; regno++)
+void
+go32_nat_target::fetch_registers (struct regcache *regcache, int regno)
+{
+ if (regno >= 0)
+ fetch_register (regcache, regno);
+ else
{
- if (regno < 16)
- supply_register (regno,
- (char *) &a_tss + regno_mapping[regno].tss_ofs);
- else if (regno < 24)
- supply_register (regno,
- (char *) &npx.reg[regno_mapping[regno].tss_ofs]);
- else if (regno < 31)
- supply_register (regno,
- (char *) &npx + regno_mapping[regno].tss_ofs);
- else
- internal_error ("Invalid register no. %d in go32_fetch_register.",
- regno);
+ for (regno = 0;
+ regno < gdbarch_fp0_regnum (regcache->arch ());
+ regno++)
+ fetch_register (regcache, regno);
+ i387_supply_fsave (regcache, -1, &npx);
}
}
static void
-store_register (int regno)
+store_register (const struct regcache *regcache, int regno)
{
- void *rp;
- void *v = (void *) ®isters[REGISTER_BYTE (regno)];
-
- if (regno < 16)
- rp = (char *) &a_tss + regno_mapping[regno].tss_ofs;
- else if (regno < 24)
- rp = (char *) &npx.reg[regno_mapping[regno].tss_ofs];
- else if (regno < 31)
- rp = (char *) &npx + regno_mapping[regno].tss_ofs;
+ struct gdbarch *gdbarch = regcache->arch ();
+ if (regno < gdbarch_fp0_regnum (gdbarch))
+ regcache->raw_collect (regno,
+ (char *) &a_tss + regno_mapping[regno].tss_ofs);
+ else if (i386_fp_regnum_p (gdbarch, regno) || i386_fpc_regnum_p (gdbarch,
+ regno))
+ i387_collect_fsave (regcache, regno, &npx);
else
- internal_error ("Invalid register no. %d in store_register.", regno);
- memcpy (rp, v, regno_mapping[regno].size);
+ internal_error (__FILE__, __LINE__,
+ _("Invalid register no. %d in store_register."), regno);
}
-static void
-go32_store_registers (int regno)
+void
+go32_nat_target::store_registers (struct regcache *regcache, int regno)
{
- int r;
+ unsigned r;
if (regno >= 0)
- store_register (regno);
+ store_register (regcache, regno);
else
{
- for (r = 0; r < sizeof (regno_mapping) / sizeof (regno_mapping[0]); r++)
- store_register (r);
+ for (r = 0; r < gdbarch_fp0_regnum (regcache->arch ()); r++)
+ store_register (regcache, r);
+ i387_collect_fsave (regcache, -1, &npx);
}
}
-static void
-go32_prepare_to_store (void)
-{
-}
+/* Const-correct version of DJGPP's write_child, which unfortunately
+ takes a non-const buffer pointer. */
static int
-go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
- struct target_ops *target)
+my_write_child (unsigned child_addr, const void *buf, unsigned len)
{
- if (write)
+ static void *buffer = NULL;
+ static unsigned buffer_len = 0;
+ int res;
+
+ if (buffer_len < len)
{
- if (write_child (memaddr, myaddr, len))
- {
- return 0;
- }
- else
- {
- return len;
- }
+ buffer = xrealloc (buffer, len);
+ buffer_len = len;
}
+
+ memcpy (buffer, buf, len);
+ res = write_child (child_addr, buffer, len);
+ return res;
+}
+
+/* Helper for go32_xfer_partial that handles memory transfers.
+ Arguments are like target_xfer_partial. */
+
+static enum target_xfer_status
+go32_xfer_memory (gdb_byte *readbuf, const gdb_byte *writebuf,
+ ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len)
+{
+ int res;
+
+ if (writebuf != NULL)
+ res = my_write_child (memaddr, writebuf, len);
else
- {
- if (read_child (memaddr, myaddr, len))
- {
- return 0;
- }
- else
- {
- return len;
- }
- }
+ res = read_child (memaddr, readbuf, len);
+
+ /* read_child and write_child return zero on success, non-zero on
+ failure. */
+ if (res != 0)
+ return TARGET_XFER_E_IO;
+
+ *xfered_len = len;
+ return TARGET_XFER_OK;
}
-static cmdline_t child_cmd; /* parsed child's command line kept here */
+/* Target to_xfer_partial implementation. */
-static void
-go32_files_info (struct target_ops *target)
+enum target_xfer_status
+go32_nat_target::xfer_partial (enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf, ULONGEST offset,
+ ULONGEST len,
+ ULONGEST *xfered_len)
{
- printf_unfiltered ("You are running a DJGPP V2 program.\n");
+ switch (object)
+ {
+ case TARGET_OBJECT_MEMORY:
+ return go32_xfer_memory (readbuf, writebuf, offset, len, xfered_len);
+
+ default:
+ return this->beneath ()->xfer_partial (object, annex,
+ readbuf, writebuf, offset, len,
+ xfered_len);
+ }
}
-static void
-go32_stop (void)
+static cmdline_t child_cmd; /* Parsed child's command line kept here. */
+
+void
+go32_nat_target::files_info ()
{
- normal_stop ();
- cleanup_client ();
- inferior_pid = 0;
- prog_has_started = 0;
+ printf_unfiltered ("You are running a DJGPP V2 program.\n");
}
-static void
-go32_kill_inferior (void)
+void
+go32_nat_target::kill_inferior ()
{
- redir_cmdline_delete (&child_cmd);
- resume_signal = -1;
- resume_is_step = 0;
- unpush_target (&go32_ops);
+ mourn_inferior ();
}
-static void
-go32_create_inferior (char *exec_file, char *args, char **env)
+void
+go32_nat_target::create_inferior (const char *exec_file,
+ const std::string &allargs,
+ char **env, int from_tty)
{
+ extern char **environ;
jmp_buf start_state;
char *cmdline;
char **env_save = environ;
+ size_t cmdlen;
+ struct inferior *inf;
+ int result;
+ const char *args = allargs.c_str ();
+
+ /* If no exec file handed to us, get it from the exec-file command -- with
+ a good, common error message if none is specified. */
+ if (exec_file == 0)
+ exec_file = get_exec_file (1);
- if (prog_has_started)
- {
- go32_stop ();
- go32_kill_inferior ();
- }
resume_signal = -1;
resume_is_step = 0;
+
+ /* Initialize child's cwd as empty to be initialized when starting
+ the child. */
+ *child_cwd = 0;
+
/* Init command line storage. */
if (redir_debug_init (&child_cmd) == -1)
- internal_error ("Cannot allocate redirection storage: not enough memory.\n");
+ internal_error (__FILE__, __LINE__,
+ _("Cannot allocate redirection storage: "
+ "not enough memory.\n"));
/* Parse the command line and create redirections. */
if (strpbrk (args, "<>"))
if (redir_cmdline_parse (args, &child_cmd) == 0)
args = child_cmd.command;
else
- error ("Syntax error in command line.");
+ error (_("Syntax error in command line."));
}
else
child_cmd.command = xstrdup (args);
- cmdline = (char *) alloca (strlen (args) + 4);
- cmdline[0] = strlen (args);
+ cmdlen = strlen (args);
+ /* v2loadimage passes command lines via DOS memory, so it cannot
+ possibly handle commands longer than 1MB. */
+ if (cmdlen > 1024*1024)
+ error (_("Command line too long."));
+
+ cmdline = (char *) xmalloc (cmdlen + 4);
strcpy (cmdline + 1, args);
- cmdline[strlen (args) + 1] = 13;
+ /* If the command-line length fits into DOS 126-char limits, use the
+ DOS command tail format; otherwise, tell v2loadimage to pass it
+ through a buffer in conventional memory. */
+ if (cmdlen < 127)
+ {
+ cmdline[0] = strlen (args);
+ cmdline[cmdlen + 1] = 13;
+ }
+ else
+ cmdline[0] = 0xff; /* Signal v2loadimage it's a long command. */
environ = env;
- if (v2loadimage (exec_file, cmdline, start_state))
- {
- environ = env_save;
- printf_unfiltered ("Load failed for image %s\n", exec_file);
- exit (1);
- }
+ result = v2loadimage (exec_file, cmdline, start_state);
+
environ = env_save;
+ xfree (cmdline);
+
+ if (result != 0)
+ error (_("Load failed for image %s"), exec_file);
edi_init (start_state);
#if __DJGPP_MINOR__ < 3
save_npx ();
#endif
- inferior_pid = SOME_PID;
- push_target (&go32_ops);
- clear_proceed_status ();
+ inferior_ptid = ptid_t (SOME_PID);
+ inf = current_inferior ();
+ inferior_appeared (inf, SOME_PID);
+
+ if (!target_is_pushed (this))
+ push_target (this);
+
+ add_thread_silent (inferior_ptid);
+
+ clear_proceed_status (0);
insert_breakpoints ();
- proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
prog_has_started = 1;
}
-static void
-go32_mourn_inferior (void)
+void
+go32_nat_target::mourn_inferior ()
{
+ ptid_t ptid;
+
+ redir_cmdline_delete (&child_cmd);
+ resume_signal = -1;
+ resume_is_step = 0;
+
+ cleanup_client ();
+
/* We need to make sure all the breakpoint enable bits in the DR7
register are reset when the inferior exits. Otherwise, if they
rerun the inferior, the uncleared bits may cause random SIGTRAPs,
be nice if GDB itself would take care to remove all breakpoints
at all times, but it doesn't, probably under an assumption that
the OS cleans up when the debuggee exits. */
- cleanup_dregs ();
- go32_kill_inferior ();
+ x86_cleanup_dregs ();
+
+ ptid = inferior_ptid;
+ inferior_ptid = null_ptid;
+ prog_has_started = 0;
+
generic_mourn_inferior ();
+ maybe_unpush_target ();
}
-static int
-go32_can_run (void)
+/* Hardware watchpoint support. */
+
+#define D_REGS edi.dr
+#define CONTROL D_REGS[7]
+#define STATUS D_REGS[6]
+
+/* Pass the address ADDR to the inferior in the I'th debug register.
+ Here we just store the address in D_REGS, the watchpoint will be
+ actually set up when go32_wait runs the debuggee. */
+static void
+go32_set_dr (int i, CORE_ADDR addr)
{
- return 1;
+ if (i < 0 || i > 3)
+ internal_error (__FILE__, __LINE__,
+ _("Invalid register %d in go32_set_dr.\n"), i);
+ D_REGS[i] = addr;
}
+/* Pass the value VAL to the inferior in the DR7 debug control
+ register. Here we just store the address in D_REGS, the watchpoint
+ will be actually set up when go32_wait runs the debuggee. */
static void
-ignore (void)
+go32_set_dr7 (unsigned long val)
{
+ CONTROL = val;
}
-/* Hardware watchpoint support. */
-
-#define DR_STATUS 6
-#define DR_CONTROL 7
-#define DR_ENABLE_SIZE 2
-#define DR_LOCAL_ENABLE_SHIFT 0
-#define DR_GLOBAL_ENABLE_SHIFT 1
-#define DR_LOCAL_SLOWDOWN 0x100
-#define DR_GLOBAL_SLOWDOWN 0x200
-#define DR_CONTROL_SHIFT 16
-#define DR_CONTROL_SIZE 4
-#define DR_RW_READWRITE 0x3
-#define DR_RW_WRITE 0x1
-#define DR_CONTROL_MASK 0xf
-#define DR_ENABLE_MASK 0x3
-#define DR_LEN_1 0x0
-#define DR_LEN_2 0x4
-#define DR_LEN_4 0xc
+/* Get the value of the DR6 debug status register from the inferior.
+ Here we just return the value stored in D_REGS, as we've got it
+ from the last go32_wait call. */
+static unsigned long
+go32_get_dr6 (void)
+{
+ return STATUS;
+}
-#define D_REGS edi.dr
-#define CONTROL D_REGS[DR_CONTROL]
-#define STATUS D_REGS[DR_STATUS]
-
-#define IS_REG_FREE(index) \
- (!(CONTROL & (3 << (DR_ENABLE_SIZE * (index)))))
-
-#define LOCAL_ENABLE_REG(index) \
- (CONTROL |= (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index))))
-
-#define GLOBAL_ENABLE_REG(index) \
- (CONTROL |= (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index))))
-
-#define DISABLE_REG(index) \
- (CONTROL &= ~(3 << (DR_ENABLE_SIZE * (index))))
-
-#define SET_LOCAL_EXACT() \
- (CONTROL |= DR_LOCAL_SLOWDOWN)
-
-#define SET_GLOBAL_EXACT() \
- (CONTROL |= DR_GLOBAL_SLOWDOWN)
-
-#define RESET_LOCAL_EXACT() \
- (CONTROL &= ~(DR_LOCAL_SLOWDOWN))
-
-#define RESET_GLOBAL_EXACT() \
- (CONTROL &= ~(DR_GLOBAL_SLOWDOWN))
-
-#define SET_BREAK(index,address) \
- do {\
- CONTROL &= ~(DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index)));\
- D_REGS[index] = address;\
- dr_ref_count[index]++;\
- } while(0)
-
-#define SET_WATCH(index,address,rw,len) \
- do {\
- SET_BREAK(index,address);\
- CONTROL |= ((len)|(rw)) << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index));\
- } while (0)
-
-#define IS_WATCH(index) \
- (CONTROL & (DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE*(index))))
-
-#define WATCH_HIT(index) ((STATUS & (1 << (index))) && IS_WATCH(index))
-
-#define DR_DEF(index) \
- ((CONTROL >> (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index))) & 0x0f)
-
-
-#if 0 /* use debugging macro */
-#define SHOW_DR(text,len) \
-do { \
- if (!getenv ("GDB_SHOW_DR")) break; \
- fprintf(stderr,"%08x %08x ",edi.dr[7],edi.dr[6]); \
- fprintf(stderr,"%08x %d %08x %d ", \
- edi.dr[0],dr_ref_count[0],edi.dr[1],dr_ref_count[1]); \
- fprintf(stderr,"%08x %d %08x %d ", \
- edi.dr[2],dr_ref_count[2],edi.dr[3],dr_ref_count[3]); \
- fprintf(stderr,(len)?"(%s:%d)\n":"(%s)\n",#text,len); \
-} while (0)
-#else
-#define SHOW_DR(text,len) do {} while (0)
-#endif
+/* Get the value of the DR7 debug status register from the inferior.
+ Here we just return the value stored in D_REGS, as we've got it
+ from the last go32_wait call. */
-static void
-cleanup_dregs (void)
+static unsigned long
+go32_get_dr7 (void)
{
- int i;
-
- CONTROL = 0;
- STATUS = 0;
- for (i = 0; i < 4; i++)
- {
- D_REGS[i] = 0;
- dr_ref_count[i] = 0;
- }
+ return CONTROL;
}
-/* Insert a watchpoint. */
+/* Get the value of the DR debug register I from the inferior. Here
+ we just return the value stored in D_REGS, as we've got it from the
+ last go32_wait call. */
-int
-go32_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw)
+static CORE_ADDR
+go32_get_dr (int i)
{
- int ret = go32_insert_aligned_watchpoint (addr, addr, len, rw);
-
- SHOW_DR (insert_watch, len);
- return ret;
+ if (i < 0 || i > 3)
+ internal_error (__FILE__, __LINE__,
+ _("Invalid register %d in go32_get_dr.\n"), i);
+ return D_REGS[i];
}
+/* Put the device open on handle FD into either raw or cooked
+ mode, return 1 if it was in raw mode, zero otherwise. */
+
static int
-go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr,
- int len, int rw)
+device_mode (int fd, int raw_p)
{
- int i;
- int read_write_bits, len_bits;
+ int oldmode, newmode;
+ __dpmi_regs regs;
- /* Values of rw: 0 - write, 1 - read, 2 - access (read and write).
- However, x86 doesn't support read-only data breakpoints. */
- read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE;
+ regs.x.ax = 0x4400;
+ regs.x.bx = fd;
+ __dpmi_int (0x21, ®s);
+ if (regs.x.flags & 1)
+ return -1;
+ newmode = oldmode = regs.x.dx;
- switch (len)
- {
- case 4:
- len_bits = DR_LEN_4;
- break;
- case 2:
- len_bits = DR_LEN_2;
- break;
- case 1:
- len_bits = DR_LEN_1;
- break;
- default:
- /* The debug registers only have 2 bits for the length, so
- so this value will always fail the loop below. */
- len_bits = 0x10;
- }
+ if (raw_p)
+ newmode |= 0x20;
+ else
+ newmode &= ~0x20;
- /* Look for an occupied debug register with the same address and the
- same RW and LEN definitions. If we find one, we can use it for
- this watchpoint as well (and save a register). */
- for (i = 0; i < 4; i++)
+ if (oldmode & 0x80) /* Only for character dev. */
{
- if (!IS_REG_FREE (i) && D_REGS[i] == addr
- && DR_DEF (i) == (len_bits | read_write_bits))
- {
- dr_ref_count[i]++;
- return 0;
- }
+ regs.x.ax = 0x4401;
+ regs.x.bx = fd;
+ regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails. */
+ __dpmi_int (0x21, ®s);
+ if (regs.x.flags & 1)
+ return -1;
}
+ return (oldmode & 0x20) == 0x20;
+}
- /* Look for a free debug register. */
- for (i = 0; i <= 3; i++)
- {
- if (IS_REG_FREE (i))
- break;
- }
- /* No more debug registers! */
- if (i > 3)
- return -1;
+static int inf_mode_valid = 0;
+static int inf_terminal_mode;
- if (len == 2)
- {
- if (addr % 2)
- return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr,
- len, rw);
- }
- else if (len == 4)
- {
- if (addr % 4)
- return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr,
- len, rw);
- }
- else if (len != 1)
- return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, len, rw);
+/* This semaphore is needed because, amazingly enough, GDB calls
+ target.to_terminal_ours more than once after the inferior stops.
+ But we need the information from the first call only, since the
+ second call will always see GDB's own cooked terminal. */
+static int terminal_is_ours = 1;
- SET_WATCH (i, addr, read_write_bits, len_bits);
- LOCAL_ENABLE_REG (i);
- SET_LOCAL_EXACT ();
- SET_GLOBAL_EXACT ();
- return 0;
+void
+go32_nat_target::terminal_init ()
+{
+ inf_mode_valid = 0; /* Reinitialize, in case they are restarting child. */
+ terminal_is_ours = 1;
}
-static int
-go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr, CORE_ADDR addr,
- int len, int rw)
+void
+go32_nat_target::terminal_info (const char *args, int from_tty)
{
- int align;
- int size;
- int rv = 0, status = 0;
+ printf_unfiltered ("Inferior's terminal is in %s mode.\n",
+ !inf_mode_valid
+ ? "default" : inf_terminal_mode ? "raw" : "cooked");
- static int size_try_array[16] =
+#if __DJGPP_MINOR__ > 2
+ if (child_cmd.redirection)
{
- 1, 1, 1, 1, /* trying size one */
- 2, 1, 2, 1, /* trying size two */
- 2, 1, 2, 1, /* trying size three */
- 4, 1, 2, 1 /* trying size four */
- };
+ int i;
- while (len > 0)
+ for (i = 0; i < DBG_HANDLES; i++)
{
- align = addr % 4;
- /* Four is the maximum length for 386. */
- size = (len > 4) ? 3 : len - 1;
- size = size_try_array[size * 4 + align];
- if (what == wp_insert)
- status = go32_insert_aligned_watchpoint (waddr, addr, size, rw);
- else if (what == wp_remove)
- status = go32_remove_aligned_watchpoint (waddr, addr, size, rw);
- else if (what == wp_count)
- rv++;
- else
- status = -1;
- /* We keep the loop going even after a failure, because some of
- the other aligned watchpoints might still succeed, e.g. if
- they watch addresses that are already watched, and thus just
- increment the reference counts of occupied debug registers.
- If we break out of the loop too early, we could cause those
- addresses watched by other watchpoints to be disabled when
- GDB reacts to our failure to insert this watchpoint and tries
- to remove it. */
- if (status)
- rv = status;
- addr += size;
- len -= size;
+ if (child_cmd.redirection[i]->file_name)
+ printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n",
+ i, child_cmd.redirection[i]->file_name);
+ else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1)
+ printf_unfiltered
+ ("\tFile handle %d appears to be closed by inferior.\n", i);
+ /* Mask off the raw/cooked bit when comparing device info words. */
+ else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf)
+ != (_get_dev_info (i) & 0xdf))
+ printf_unfiltered
+ ("\tFile handle %d appears to be redirected by inferior.\n", i);
}
- return rv;
-}
+ }
+#endif
+}
-/* Remove a watchpoint. */
+void
+go32_nat_target::terminal_inferior ()
+{
+ /* Redirect standard handles as child wants them. */
+ errno = 0;
+ if (redir_to_child (&child_cmd) == -1)
+ {
+ redir_to_debugger (&child_cmd);
+ error (_("Cannot redirect standard handles for program: %s."),
+ safe_strerror (errno));
+ }
+ /* Set the console device of the inferior to whatever mode
+ (raw or cooked) we found it last time. */
+ if (terminal_is_ours)
+ {
+ if (inf_mode_valid)
+ device_mode (0, inf_terminal_mode);
+ terminal_is_ours = 0;
+ }
+}
-int
-go32_remove_watchpoint (int pid, CORE_ADDR addr, int len, int rw)
+void
+go32_nat_target::terminal_ours ()
+{
+ /* Switch to cooked mode on the gdb terminal and save the inferior
+ terminal mode to be restored when it is resumed. */
+ if (!terminal_is_ours)
+ {
+ inf_terminal_mode = device_mode (0, 0);
+ if (inf_terminal_mode != -1)
+ inf_mode_valid = 1;
+ else
+ /* If device_mode returned -1, we don't know what happens with
+ handle 0 anymore, so make the info invalid. */
+ inf_mode_valid = 0;
+ terminal_is_ours = 1;
+
+ /* Restore debugger's standard handles. */
+ errno = 0;
+ if (redir_to_debugger (&child_cmd) == -1)
+ {
+ redir_to_child (&child_cmd);
+ error (_("Cannot redirect standard handles for debugger: %s."),
+ safe_strerror (errno));
+ }
+ }
+}
+
+void
+go32_nat_target::pass_ctrlc ()
{
- int ret = go32_remove_aligned_watchpoint (addr, addr, len, rw);
+}
- SHOW_DR (remove_watch, len);
- return ret;
+bool
+go32_nat_target::thread_alive (ptid_t ptid)
+{
+ return ptid != null_ptid;
}
+std::string
+go32_nat_target::pid_to_str (ptid_t ptid)
+{
+ return normal_pid_to_str (ptid);
+}
+
+/* Return the current DOS codepage number. */
static int
-go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr,
- int len, int rw)
+dos_codepage (void)
{
- int i;
- int read_write_bits, len_bits;
+ __dpmi_regs regs;
- /* Values of rw: 0 - write, 1 - read, 2 - access (read and write).
- However, x86 doesn't support read-only data breakpoints. */
- read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE;
+ regs.x.ax = 0x6601;
+ __dpmi_int (0x21, ®s);
+ if (!(regs.x.flags & 1))
+ return regs.x.bx & 0xffff;
+ else
+ return 437; /* default */
+}
+
+/* Limited emulation of `nl_langinfo', for charset.c. */
+char *
+nl_langinfo (nl_item item)
+{
+ char *retval;
- switch (len)
+ switch (item)
{
- case 4:
- len_bits = DR_LEN_4;
- break;
- case 2:
- len_bits = DR_LEN_2;
- break;
- case 1:
- len_bits = DR_LEN_1;
+ case CODESET:
+ {
+ /* 8 is enough for SHORT_MAX + "CP" + null. */
+ char buf[8];
+ int blen = sizeof (buf);
+ int needed = snprintf (buf, blen, "CP%d", dos_codepage ());
+
+ if (needed > blen) /* Should never happen. */
+ buf[0] = 0;
+ retval = xstrdup (buf);
+ }
break;
default:
- /* The debug registers only have 2 bits for the length, so
- so this value will always fail the loop below. */
- len_bits = 0x10;
+ retval = xstrdup ("");
+ break;
}
+ return retval;
+}
+
+unsigned short windows_major, windows_minor;
- if (len == 2)
+/* Compute the version Windows reports via Int 2Fh/AX=1600h. */
+static void
+go32_get_windows_version(void)
+{
+ __dpmi_regs r;
+
+ r.x.ax = 0x1600;
+ __dpmi_int(0x2f, &r);
+ if (r.h.al > 2 && r.h.al != 0x80 && r.h.al != 0xff
+ && (r.h.al > 3 || r.h.ah > 0))
{
- if (addr % 2)
- return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr,
- len, rw);
+ windows_major = r.h.al;
+ windows_minor = r.h.ah;
}
- else if (len == 4)
+ else
+ windows_major = 0xff; /* meaning no Windows */
+}
+
+/* A subroutine of go32_sysinfo to display memory info. */
+static void
+print_mem (unsigned long datum, const char *header, int in_pages_p)
+{
+ if (datum != 0xffffffffUL)
{
- if (addr % 4)
- return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr,
- len, rw);
+ if (in_pages_p)
+ datum <<= 12;
+ puts_filtered (header);
+ if (datum > 1024)
+ {
+ printf_filtered ("%lu KB", datum >> 10);
+ if (datum > 1024 * 1024)
+ printf_filtered (" (%lu MB)", datum >> 20);
+ }
+ else
+ printf_filtered ("%lu Bytes", datum);
+ puts_filtered ("\n");
}
- else if (len != 1)
- return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, len, rw);
+}
+
+/* Display assorted information about the underlying OS. */
+static void
+go32_sysinfo (const char *arg, int from_tty)
+{
+ static const char test_pattern[] =
+ "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf"
+ "deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf"
+ "deadbeafdeadbeafdeadbeafdeadbeafdeadbeafdeadbeaf";
+ struct utsname u;
+ char cpuid_vendor[13];
+ unsigned cpuid_max = 0, cpuid_eax, cpuid_ebx, cpuid_ecx, cpuid_edx;
+ unsigned true_dos_version = _get_dos_version (1);
+ unsigned advertized_dos_version = ((unsigned int)_osmajor << 8) | _osminor;
+ int dpmi_flags;
+ char dpmi_vendor_info[129];
+ int dpmi_vendor_available;
+ __dpmi_version_ret dpmi_version_data;
+ long eflags;
+ __dpmi_free_mem_info mem_info;
+ __dpmi_regs regs;
- for (i = 0; i <= 3; i++)
+ cpuid_vendor[0] = '\0';
+ if (uname (&u))
+ strcpy (u.machine, "Unknown x86");
+ else if (u.machine[0] == 'i' && u.machine[1] > 4)
{
- if (!IS_REG_FREE (i) && D_REGS[i] == addr
- && DR_DEF (i) == (len_bits | read_write_bits))
+ /* CPUID with EAX = 0 returns the Vendor ID. */
+#if 0
+ /* Ideally we would use x86_cpuid(), but it needs someone to run
+ native tests first to make sure things actually work. They should.
+ http://sourceware.org/ml/gdb-patches/2013-05/msg00164.html */
+ unsigned int eax, ebx, ecx, edx;
+
+ if (x86_cpuid (0, &eax, &ebx, &ecx, &edx))
{
- dr_ref_count[i]--;
- if (dr_ref_count[i] == 0)
- DISABLE_REG (i);
+ cpuid_max = eax;
+ memcpy (&vendor[0], &ebx, 4);
+ memcpy (&vendor[4], &ecx, 4);
+ memcpy (&vendor[8], &edx, 4);
+ cpuid_vendor[12] = '\0';
}
+#else
+ __asm__ __volatile__ ("xorl %%ebx, %%ebx;"
+ "xorl %%ecx, %%ecx;"
+ "xorl %%edx, %%edx;"
+ "movl $0, %%eax;"
+ "cpuid;"
+ "movl %%ebx, %0;"
+ "movl %%edx, %1;"
+ "movl %%ecx, %2;"
+ "movl %%eax, %3;"
+ : "=m" (cpuid_vendor[0]),
+ "=m" (cpuid_vendor[4]),
+ "=m" (cpuid_vendor[8]),
+ "=m" (cpuid_max)
+ :
+ : "%eax", "%ebx", "%ecx", "%edx");
+ cpuid_vendor[12] = '\0';
+#endif
}
- RESET_LOCAL_EXACT ();
- RESET_GLOBAL_EXACT ();
- return 0;
+ printf_filtered ("CPU Type.......................%s", u.machine);
+ if (cpuid_vendor[0])
+ printf_filtered (" (%s)", cpuid_vendor);
+ puts_filtered ("\n");
+
+ /* CPUID with EAX = 1 returns processor signature and features. */
+ if (cpuid_max >= 1)
+ {
+ static const char *brand_name[] = {
+ "",
+ " Celeron",
+ " III",
+ " III Xeon",
+ "", "", "", "",
+ " 4"
+ };
+ char cpu_string[80];
+ char cpu_brand[20];
+ unsigned brand_idx;
+ int intel_p = strcmp (cpuid_vendor, "GenuineIntel") == 0;
+ int amd_p = strcmp (cpuid_vendor, "AuthenticAMD") == 0;
+ int hygon_p = strcmp (cpuid_vendor, "HygonGenuine") == 0;
+ unsigned cpu_family, cpu_model;
+
+#if 0
+ /* See comment above about cpuid usage. */
+ x86_cpuid (1, &cpuid_eax, &cpuid_ebx, NULL, &cpuid_edx);
+#else
+ __asm__ __volatile__ ("movl $1, %%eax;"
+ "cpuid;"
+ : "=a" (cpuid_eax),
+ "=b" (cpuid_ebx),
+ "=d" (cpuid_edx)
+ :
+ : "%ecx");
+#endif
+ brand_idx = cpuid_ebx & 0xff;
+ cpu_family = (cpuid_eax >> 8) & 0xf;
+ cpu_model = (cpuid_eax >> 4) & 0xf;
+ cpu_brand[0] = '\0';
+ if (intel_p)
+ {
+ if (brand_idx > 0
+ && brand_idx < sizeof(brand_name)/sizeof(brand_name[0])
+ && *brand_name[brand_idx])
+ strcpy (cpu_brand, brand_name[brand_idx]);
+ else if (cpu_family == 5)
+ {
+ if (((cpuid_eax >> 12) & 3) == 0 && cpu_model == 4)
+ strcpy (cpu_brand, " MMX");
+ else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 1)
+ strcpy (cpu_brand, " OverDrive");
+ else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 2)
+ strcpy (cpu_brand, " Dual");
+ }
+ else if (cpu_family == 6 && cpu_model < 8)
+ {
+ switch (cpu_model)
+ {
+ case 1:
+ strcpy (cpu_brand, " Pro");
+ break;
+ case 3:
+ strcpy (cpu_brand, " II");
+ break;
+ case 5:
+ strcpy (cpu_brand, " II Xeon");
+ break;
+ case 6:
+ strcpy (cpu_brand, " Celeron");
+ break;
+ case 7:
+ strcpy (cpu_brand, " III");
+ break;
+ }
+ }
+ }
+ else if (amd_p)
+ {
+ switch (cpu_family)
+ {
+ case 4:
+ strcpy (cpu_brand, "486/5x86");
+ break;
+ case 5:
+ switch (cpu_model)
+ {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ strcpy (cpu_brand, "-K5");
+ break;
+ case 6:
+ case 7:
+ strcpy (cpu_brand, "-K6");
+ break;
+ case 8:
+ strcpy (cpu_brand, "-K6-2");
+ break;
+ case 9:
+ strcpy (cpu_brand, "-K6-III");
+ break;
+ }
+ break;
+ case 6:
+ switch (cpu_model)
+ {
+ case 1:
+ case 2:
+ case 4:
+ strcpy (cpu_brand, " Athlon");
+ break;
+ case 3:
+ strcpy (cpu_brand, " Duron");
+ break;
+ }
+ break;
+ }
+ }
+ xsnprintf (cpu_string, sizeof (cpu_string), "%s%s Model %d Stepping %d",
+ intel_p ? "Pentium" : (amd_p ? "AMD" : (hygon_p ? "Hygon" : "ix86")),
+ cpu_brand, cpu_model, cpuid_eax & 0xf);
+ printfi_filtered (31, "%s\n", cpu_string);
+ if (((cpuid_edx & (6 | (0x0d << 23))) != 0)
+ || ((cpuid_edx & 1) == 0)
+ || ((amd_p || hygon_p) && (cpuid_edx & (3 << 30)) != 0))
+ {
+ puts_filtered ("CPU Features...................");
+ /* We only list features which might be useful in the DPMI
+ environment. */
+ if ((cpuid_edx & 1) == 0)
+ puts_filtered ("No FPU "); /* It's unusual to not have an FPU. */
+ if ((cpuid_edx & (1 << 1)) != 0)
+ puts_filtered ("VME ");
+ if ((cpuid_edx & (1 << 2)) != 0)
+ puts_filtered ("DE ");
+ if ((cpuid_edx & (1 << 4)) != 0)
+ puts_filtered ("TSC ");
+ if ((cpuid_edx & (1 << 23)) != 0)
+ puts_filtered ("MMX ");
+ if ((cpuid_edx & (1 << 25)) != 0)
+ puts_filtered ("SSE ");
+ if ((cpuid_edx & (1 << 26)) != 0)
+ puts_filtered ("SSE2 ");
+ if (amd_p || hygon_p)
+ {
+ if ((cpuid_edx & (1 << 31)) != 0)
+ puts_filtered ("3DNow! ");
+ if ((cpuid_edx & (1 << 30)) != 0)
+ puts_filtered ("3DNow!Ext");
+ }
+ puts_filtered ("\n");
+ }
+ }
+ puts_filtered ("\n");
+ printf_filtered ("DOS Version....................%s %s.%s",
+ _os_flavor, u.release, u.version);
+ if (true_dos_version != advertized_dos_version)
+ printf_filtered (" (disguised as v%d.%d)", _osmajor, _osminor);
+ puts_filtered ("\n");
+ if (!windows_major)
+ go32_get_windows_version ();
+ if (windows_major != 0xff)
+ {
+ const char *windows_flavor;
+
+ printf_filtered ("Windows Version................%d.%02d (Windows ",
+ windows_major, windows_minor);
+ switch (windows_major)
+ {
+ case 3:
+ windows_flavor = "3.X";
+ break;
+ case 4:
+ switch (windows_minor)
+ {
+ case 0:
+ windows_flavor = "95, 95A, or 95B";
+ break;
+ case 3:
+ windows_flavor = "95B OSR2.1 or 95C OSR2.5";
+ break;
+ case 10:
+ windows_flavor = "98 or 98 SE";
+ break;
+ case 90:
+ windows_flavor = "ME";
+ break;
+ default:
+ windows_flavor = "9X";
+ break;
+ }
+ break;
+ default:
+ windows_flavor = "??";
+ break;
+ }
+ printf_filtered ("%s)\n", windows_flavor);
+ }
+ else if (true_dos_version == 0x532 && advertized_dos_version == 0x500)
+ printf_filtered ("Windows Version................"
+ "Windows NT family (W2K/XP/W2K3/Vista/W2K8)\n");
+ puts_filtered ("\n");
+ /* On some versions of Windows, __dpmi_get_capabilities returns
+ zero, but the buffer is not filled with info, so we fill the
+ buffer with a known pattern and test for it afterwards. */
+ memcpy (dpmi_vendor_info, test_pattern, sizeof(dpmi_vendor_info));
+ dpmi_vendor_available =
+ __dpmi_get_capabilities (&dpmi_flags, dpmi_vendor_info);
+ if (dpmi_vendor_available == 0
+ && memcmp (dpmi_vendor_info, test_pattern,
+ sizeof(dpmi_vendor_info)) != 0)
+ {
+ /* The DPMI spec says the vendor string should be ASCIIZ, but
+ I don't trust the vendors to follow that... */
+ if (!memchr (&dpmi_vendor_info[2], 0, 126))
+ dpmi_vendor_info[128] = '\0';
+ printf_filtered ("DPMI Host......................"
+ "%s v%d.%d (capabilities: %#x)\n",
+ &dpmi_vendor_info[2],
+ (unsigned)dpmi_vendor_info[0],
+ (unsigned)dpmi_vendor_info[1],
+ ((unsigned)dpmi_flags & 0x7f));
+ }
+ else
+ printf_filtered ("DPMI Host......................(Info not available)\n");
+ __dpmi_get_version (&dpmi_version_data);
+ printf_filtered ("DPMI Version...................%d.%02d\n",
+ dpmi_version_data.major, dpmi_version_data.minor);
+ printf_filtered ("DPMI Info......................"
+ "%s-bit DPMI, with%s Virtual Memory support\n",
+ (dpmi_version_data.flags & 1) ? "32" : "16",
+ (dpmi_version_data.flags & 4) ? "" : "out");
+ printfi_filtered (31, "Interrupts reflected to %s mode\n",
+ (dpmi_version_data.flags & 2) ? "V86" : "Real");
+ printfi_filtered (31, "Processor type: i%d86\n",
+ dpmi_version_data.cpu);
+ printfi_filtered (31, "PIC base interrupt: Master: %#x Slave: %#x\n",
+ dpmi_version_data.master_pic, dpmi_version_data.slave_pic);
+
+ /* a_tss is only initialized when the debuggee is first run. */
+ if (prog_has_started)
+ {
+ __asm__ __volatile__ ("pushfl ; popl %0" : "=g" (eflags));
+ printf_filtered ("Protection....................."
+ "Ring %d (in %s), with%s I/O protection\n",
+ a_tss.tss_cs & 3, (a_tss.tss_cs & 4) ? "LDT" : "GDT",
+ (a_tss.tss_cs & 3) > ((eflags >> 12) & 3) ? "" : "out");
+ }
+ puts_filtered ("\n");
+ __dpmi_get_free_memory_information (&mem_info);
+ print_mem (mem_info.total_number_of_physical_pages,
+ "DPMI Total Physical Memory.....", 1);
+ print_mem (mem_info.total_number_of_free_pages,
+ "DPMI Free Physical Memory......", 1);
+ print_mem (mem_info.size_of_paging_file_partition_in_pages,
+ "DPMI Swap Space................", 1);
+ print_mem (mem_info.linear_address_space_size_in_pages,
+ "DPMI Total Linear Address Size.", 1);
+ print_mem (mem_info.free_linear_address_space_in_pages,
+ "DPMI Free Linear Address Size..", 1);
+ print_mem (mem_info.largest_available_free_block_in_bytes,
+ "DPMI Largest Free Memory Block.", 0);
+
+ regs.h.ah = 0x48;
+ regs.x.bx = 0xffff;
+ __dpmi_int (0x21, ®s);
+ print_mem (regs.x.bx << 4, "Free DOS Memory................", 0);
+ regs.x.ax = 0x5800;
+ __dpmi_int (0x21, ®s);
+ if ((regs.x.flags & 1) == 0)
+ {
+ static const char *dos_hilo[] = {
+ "Low", "", "", "", "High", "", "", "", "High, then Low"
+ };
+ static const char *dos_fit[] = {
+ "First", "Best", "Last"
+ };
+ int hilo_idx = (regs.x.ax >> 4) & 0x0f;
+ int fit_idx = regs.x.ax & 0x0f;
+
+ if (hilo_idx > 8)
+ hilo_idx = 0;
+ if (fit_idx > 2)
+ fit_idx = 0;
+ printf_filtered ("DOS Memory Allocation..........%s memory, %s fit\n",
+ dos_hilo[hilo_idx], dos_fit[fit_idx]);
+ regs.x.ax = 0x5802;
+ __dpmi_int (0x21, ®s);
+ if ((regs.x.flags & 1) != 0)
+ regs.h.al = 0;
+ printfi_filtered (31, "UMBs %sin DOS memory chain\n",
+ regs.h.al == 0 ? "not " : "");
+ }
}
-/* Can we use debug registers to watch a region whose address is ADDR
- and whose length is LEN bytes? */
+struct seg_descr {
+ unsigned short limit0;
+ unsigned short base0;
+ unsigned char base1;
+ unsigned stype:5;
+ unsigned dpl:2;
+ unsigned present:1;
+ unsigned limit1:4;
+ unsigned available:1;
+ unsigned dummy:1;
+ unsigned bit32:1;
+ unsigned page_granular:1;
+ unsigned char base2;
+} __attribute__ ((packed));
+
+struct gate_descr {
+ unsigned short offset0;
+ unsigned short selector;
+ unsigned param_count:5;
+ unsigned dummy:3;
+ unsigned stype:5;
+ unsigned dpl:2;
+ unsigned present:1;
+ unsigned short offset1;
+} __attribute__ ((packed));
+
+/* Read LEN bytes starting at logical address ADDR, and put the result
+ into DEST. Return 1 if success, zero if not. */
+static int
+read_memory_region (unsigned long addr, void *dest, size_t len)
+{
+ unsigned long dos_ds_limit = __dpmi_get_segment_limit (_dos_ds);
+ int retval = 1;
-int
-go32_region_ok_for_watchpoint (CORE_ADDR addr, int len)
+ /* For the low memory, we can simply use _dos_ds. */
+ if (addr <= dos_ds_limit - len)
+ dosmemget (addr, len, dest);
+ else
+ {
+ /* For memory above 1MB we need to set up a special segment to
+ be able to access that memory. */
+ int sel = __dpmi_allocate_ldt_descriptors (1);
+
+ if (sel <= 0)
+ retval = 0;
+ else
+ {
+ int access_rights = __dpmi_get_descriptor_access_rights (sel);
+ size_t segment_limit = len - 1;
+
+ /* Make sure the crucial bits in the descriptor access
+ rights are set correctly. Some DPMI providers might barf
+ if we set the segment limit to something that is not an
+ integral multiple of 4KB pages if the granularity bit is
+ not set to byte-granular, even though the DPMI spec says
+ it's the host's responsibility to set that bit correctly. */
+ if (len > 1024 * 1024)
+ {
+ access_rights |= 0x8000;
+ /* Page-granular segments should have the low 12 bits of
+ the limit set. */
+ segment_limit |= 0xfff;
+ }
+ else
+ access_rights &= ~0x8000;
+
+ if (__dpmi_set_segment_base_address (sel, addr) != -1
+ && __dpmi_set_descriptor_access_rights (sel, access_rights) != -1
+ && __dpmi_set_segment_limit (sel, segment_limit) != -1
+ /* W2K silently fails to set the segment limit, leaving
+ it at zero; this test avoids the resulting crash. */
+ && __dpmi_get_segment_limit (sel) >= segment_limit)
+ movedata (sel, 0, _my_ds (), (unsigned)dest, len);
+ else
+ retval = 0;
+
+ __dpmi_free_ldt_descriptor (sel);
+ }
+ }
+ return retval;
+}
+
+/* Get a segment descriptor stored at index IDX in the descriptor
+ table whose base address is TABLE_BASE. Return the descriptor
+ type, or -1 if failure. */
+static int
+get_descriptor (unsigned long table_base, int idx, void *descr)
{
- /* Compute how many aligned watchpoints we would need to cover this
- region. */
- int nregs = go32_handle_nonaligned_watchpoint (wp_count, addr, addr, len, 0);
+ unsigned long addr = table_base + idx * 8; /* 8 bytes per entry */
- return nregs <= 4 ? 1 : 0;
+ if (read_memory_region (addr, descr, 8))
+ return (int)((struct seg_descr *)descr)->stype;
+ return -1;
}
-/* Check if stopped by a data watchpoint. If so, return the address
- whose access triggered the watchpoint. */
+struct dtr_reg {
+ unsigned short limit __attribute__((packed));
+ unsigned long base __attribute__((packed));
+};
-CORE_ADDR
-go32_stopped_by_watchpoint (int pid, int data_watchpoint)
+/* Display a segment descriptor stored at index IDX in a descriptor
+ table whose type is TYPE and whose base address is BASE_ADDR. If
+ FORCE is non-zero, display even invalid descriptors. */
+static void
+display_descriptor (unsigned type, unsigned long base_addr, int idx, int force)
{
- int i, ret = 0;
- int status;
+ struct seg_descr descr;
+ struct gate_descr gate;
- status = edi.dr[DR_STATUS];
- SHOW_DR (stopped_by, 0);
- for (i = 0; i <= 3; i++)
+ /* Get the descriptor from the table. */
+ if (idx == 0 && type == 0)
+ puts_filtered ("0x000: null descriptor\n");
+ else if (get_descriptor (base_addr, idx, &descr) != -1)
{
- if (WATCH_HIT (i) && data_watchpoint)
+ /* For each type of descriptor table, this has a bit set if the
+ corresponding type of selectors is valid in that table. */
+ static unsigned allowed_descriptors[] = {
+ 0xffffdafeL, /* GDT */
+ 0x0000c0e0L, /* IDT */
+ 0xffffdafaL /* LDT */
+ };
+
+ /* If the program hasn't started yet, assume the debuggee will
+ have the same CPL as the debugger. */
+ int cpl = prog_has_started ? (a_tss.tss_cs & 3) : _my_cs () & 3;
+ unsigned long limit = (descr.limit1 << 16) | descr.limit0;
+
+ if (descr.present
+ && (allowed_descriptors[type] & (1 << descr.stype)) != 0)
{
- SHOW_DR (WP_HIT, 0);
- ret = D_REGS[i];
+ printf_filtered ("0x%03x: ",
+ type == 1
+ ? idx : (idx * 8) | (type ? (cpl | 4) : 0));
+ if (descr.page_granular)
+ limit = (limit << 12) | 0xfff; /* big segment: low 12 bit set */
+ if (descr.stype == 1 || descr.stype == 2 || descr.stype == 3
+ || descr.stype == 9 || descr.stype == 11
+ || (descr.stype >= 16 && descr.stype < 32))
+ printf_filtered ("base=0x%02x%02x%04x limit=0x%08lx",
+ descr.base2, descr.base1, descr.base0, limit);
+
+ switch (descr.stype)
+ {
+ case 1:
+ case 3:
+ printf_filtered (" 16-bit TSS (task %sactive)",
+ descr.stype == 3 ? "" : "in");
+ break;
+ case 2:
+ puts_filtered (" LDT");
+ break;
+ case 4:
+ memcpy (&gate, &descr, sizeof gate);
+ printf_filtered ("selector=0x%04x offs=0x%04x%04x",
+ gate.selector, gate.offset1, gate.offset0);
+ printf_filtered (" 16-bit Call Gate (params=%d)",
+ gate.param_count);
+ break;
+ case 5:
+ printf_filtered ("TSS selector=0x%04x", descr.base0);
+ printfi_filtered (16, "Task Gate");
+ break;
+ case 6:
+ case 7:
+ memcpy (&gate, &descr, sizeof gate);
+ printf_filtered ("selector=0x%04x offs=0x%04x%04x",
+ gate.selector, gate.offset1, gate.offset0);
+ printf_filtered (" 16-bit %s Gate",
+ descr.stype == 6 ? "Interrupt" : "Trap");
+ break;
+ case 9:
+ case 11:
+ printf_filtered (" 32-bit TSS (task %sactive)",
+ descr.stype == 3 ? "" : "in");
+ break;
+ case 12:
+ memcpy (&gate, &descr, sizeof gate);
+ printf_filtered ("selector=0x%04x offs=0x%04x%04x",
+ gate.selector, gate.offset1, gate.offset0);
+ printf_filtered (" 32-bit Call Gate (params=%d)",
+ gate.param_count);
+ break;
+ case 14:
+ case 15:
+ memcpy (&gate, &descr, sizeof gate);
+ printf_filtered ("selector=0x%04x offs=0x%04x%04x",
+ gate.selector, gate.offset1, gate.offset0);
+ printf_filtered (" 32-bit %s Gate",
+ descr.stype == 14 ? "Interrupt" : "Trap");
+ break;
+ case 16: /* data segments */
+ case 17:
+ case 18:
+ case 19:
+ case 20:
+ case 21:
+ case 22:
+ case 23:
+ printf_filtered (" %s-bit Data (%s Exp-%s%s)",
+ descr.bit32 ? "32" : "16",
+ descr.stype & 2
+ ? "Read/Write," : "Read-Only, ",
+ descr.stype & 4 ? "down" : "up",
+ descr.stype & 1 ? "" : ", N.Acc");
+ break;
+ case 24: /* code segments */
+ case 25:
+ case 26:
+ case 27:
+ case 28:
+ case 29:
+ case 30:
+ case 31:
+ printf_filtered (" %s-bit Code (%s, %sConf%s)",
+ descr.bit32 ? "32" : "16",
+ descr.stype & 2 ? "Exec/Read" : "Exec-Only",
+ descr.stype & 4 ? "" : "N.",
+ descr.stype & 1 ? "" : ", N.Acc");
+ break;
+ default:
+ printf_filtered ("Unknown type 0x%02x", descr.stype);
+ break;
+ }
+ puts_filtered ("\n");
+ }
+ else if (force)
+ {
+ printf_filtered ("0x%03x: ",
+ type == 1
+ ? idx : (idx * 8) | (type ? (cpl | 4) : 0));
+ if (!descr.present)
+ puts_filtered ("Segment not present\n");
+ else
+ printf_filtered ("Segment type 0x%02x is invalid in this table\n",
+ descr.stype);
}
}
-
- return ret;
+ else if (force)
+ printf_filtered ("0x%03x: Cannot read this descriptor\n", idx);
}
-/* Remove a breakpoint. */
-
-int
-go32_remove_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow)
+static void
+go32_sldt (const char *arg, int from_tty)
{
- int i;
- for (i = 0; i <= 3; i++)
+ struct dtr_reg gdtr;
+ unsigned short ldtr = 0;
+ int ldt_idx;
+ struct seg_descr ldt_descr;
+ long ldt_entry = -1L;
+ int cpl = (prog_has_started ? a_tss.tss_cs : _my_cs ()) & 3;
+
+ if (arg && *arg)
+ {
+ arg = skip_spaces (arg);
+
+ if (*arg)
+ {
+ ldt_entry = parse_and_eval_long (arg);
+ if (ldt_entry < 0
+ || (ldt_entry & 4) == 0
+ || (ldt_entry & 3) != (cpl & 3))
+ error (_("Invalid LDT entry 0x%03lx."), (unsigned long)ldt_entry);
+ }
+ }
+
+ __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ );
+ __asm__ __volatile__ ("sldt %0" : "=m" (ldtr) : /* no inputs */ );
+ ldt_idx = ldtr / 8;
+ if (ldt_idx == 0)
+ puts_filtered ("There is no LDT.\n");
+ /* LDT's entry in the GDT must have the type LDT, which is 2. */
+ else if (get_descriptor (gdtr.base, ldt_idx, &ldt_descr) != 2)
+ printf_filtered ("LDT is present (at %#x), but unreadable by GDB.\n",
+ ldt_descr.base0
+ | (ldt_descr.base1 << 16)
+ | (ldt_descr.base2 << 24));
+ else
{
- if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0)
+ unsigned base =
+ ldt_descr.base0
+ | (ldt_descr.base1 << 16)
+ | (ldt_descr.base2 << 24);
+ unsigned limit = ldt_descr.limit0 | (ldt_descr.limit1 << 16);
+ int max_entry;
+
+ if (ldt_descr.page_granular)
+ /* Page-granular segments must have the low 12 bits of their
+ limit set. */
+ limit = (limit << 12) | 0xfff;
+ /* LDT cannot have more than 8K 8-byte entries, i.e. more than
+ 64KB. */
+ if (limit > 0xffff)
+ limit = 0xffff;
+
+ max_entry = (limit + 1) / 8;
+
+ if (ldt_entry >= 0)
+ {
+ if (ldt_entry > limit)
+ error (_("Invalid LDT entry %#lx: outside valid limits [0..%#x]"),
+ (unsigned long)ldt_entry, limit);
+
+ display_descriptor (ldt_descr.stype, base, ldt_entry / 8, 1);
+ }
+ else
{
- dr_ref_count[i]--;
- if (dr_ref_count[i] == 0)
- DISABLE_REG (i);
+ int i;
+
+ for (i = 0; i < max_entry; i++)
+ display_descriptor (ldt_descr.stype, base, i, 0);
}
}
- SHOW_DR (remove_hw, 0);
- return 0;
}
-int
-go32_insert_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow)
+static void
+go32_sgdt (const char *arg, int from_tty)
{
- int i;
- int read_write_bits, len_bits;
- int free_debug_register;
- int register_number;
-
- /* Look for an occupied debug register with the same address and the
- same RW and LEN definitions. If we find one, we can use it for
- this breakpoint as well (and save a register). */
- for (i = 0; i < 4; i++)
+ struct dtr_reg gdtr;
+ long gdt_entry = -1L;
+ int max_entry;
+
+ if (arg && *arg)
{
- if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0)
+ arg = skip_spaces (arg);
+
+ if (*arg)
{
- dr_ref_count[i]++;
- SHOW_DR (insert_hw, 0);
- return 0;
+ gdt_entry = parse_and_eval_long (arg);
+ if (gdt_entry < 0 || (gdt_entry & 7) != 0)
+ error (_("Invalid GDT entry 0x%03lx: "
+ "not an integral multiple of 8."),
+ (unsigned long)gdt_entry);
}
}
- /* Look for a free debug register. */
- for (i = 0; i <= 3; i++)
+ __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ );
+ max_entry = (gdtr.limit + 1) / 8;
+
+ if (gdt_entry >= 0)
{
- if (IS_REG_FREE (i))
- break;
+ if (gdt_entry > gdtr.limit)
+ error (_("Invalid GDT entry %#lx: outside valid limits [0..%#x]"),
+ (unsigned long)gdt_entry, gdtr.limit);
+
+ display_descriptor (0, gdtr.base, gdt_entry / 8, 1);
}
+ else
+ {
+ int i;
+
+ for (i = 0; i < max_entry; i++)
+ display_descriptor (0, gdtr.base, i, 0);
+ }
+}
- /* No more debug registers? */
- if (i < 4)
+static void
+go32_sidt (const char *arg, int from_tty)
+{
+ struct dtr_reg idtr;
+ long idt_entry = -1L;
+ int max_entry;
+
+ if (arg && *arg)
{
- SET_BREAK (i, addr);
- LOCAL_ENABLE_REG (i);
+ arg = skip_spaces (arg);
+
+ if (*arg)
+ {
+ idt_entry = parse_and_eval_long (arg);
+ if (idt_entry < 0)
+ error (_("Invalid (negative) IDT entry %ld."), idt_entry);
+ }
}
- SHOW_DR (insert_hw, 0);
- return i < 4 ? 0 : -1;
+ __asm__ __volatile__ ("sidt %0" : "=m" (idtr) : /* no inputs */ );
+ max_entry = (idtr.limit + 1) / 8;
+ if (max_entry > 0x100) /* No more than 256 entries. */
+ max_entry = 0x100;
+
+ if (idt_entry >= 0)
+ {
+ if (idt_entry > idtr.limit)
+ error (_("Invalid IDT entry %#lx: outside valid limits [0..%#x]"),
+ (unsigned long)idt_entry, idtr.limit);
+
+ display_descriptor (1, idtr.base, idt_entry, 1);
+ }
+ else
+ {
+ int i;
+
+ for (i = 0; i < max_entry; i++)
+ display_descriptor (1, idtr.base, i, 0);
+ }
}
-/* Put the device open on handle FD into either raw or cooked
- mode, return 1 if it was in raw mode, zero otherwise. */
+/* Cached linear address of the base of the page directory. For
+ now, available only under CWSDPMI. Code based on ideas and
+ suggestions from Charles Sandmann <sandmann@clio.rice.edu>. */
+static unsigned long pdbr;
-static int
-device_mode (int fd, int raw_p)
+static unsigned long
+get_cr3 (void)
{
- int oldmode, newmode;
- __dpmi_regs regs;
+ unsigned offset;
+ unsigned taskreg;
+ unsigned long taskbase, cr3;
+ struct dtr_reg gdtr;
- regs.x.ax = 0x4400;
- regs.x.bx = fd;
- __dpmi_int (0x21, ®s);
- if (regs.x.flags & 1)
- return -1;
- newmode = oldmode = regs.x.dx;
+ if (pdbr > 0 && pdbr <= 0xfffff)
+ return pdbr;
- if (raw_p)
- newmode |= 0x20;
- else
- newmode &= ~0x20;
+ /* Get the linear address of GDT and the Task Register. */
+ __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ );
+ __asm__ __volatile__ ("str %0" : "=m" (taskreg) : /* no inputs */ );
- if (oldmode & 0x80) /* Only for character dev */
- {
- regs.x.ax = 0x4401;
- regs.x.bx = fd;
- regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails */
- __dpmi_int (0x21, ®s);
- if (regs.x.flags & 1)
- return -1;
- }
- return (oldmode & 0x20) == 0x20;
+ /* Task Register is a segment selector for the TSS of the current
+ task. Therefore, it can be used as an index into the GDT to get
+ at the segment descriptor for the TSS. To get the index, reset
+ the low 3 bits of the selector (which give the CPL). Add 2 to the
+ offset to point to the 3 low bytes of the base address. */
+ offset = gdtr.base + (taskreg & 0xfff8) + 2;
+
+
+ /* CWSDPMI's task base is always under the 1MB mark. */
+ if (offset > 0xfffff)
+ return 0;
+
+ _farsetsel (_dos_ds);
+ taskbase = _farnspeekl (offset) & 0xffffffU;
+ taskbase += _farnspeekl (offset + 2) & 0xff000000U;
+ if (taskbase > 0xfffff)
+ return 0;
+
+ /* CR3 (a.k.a. PDBR, the Page Directory Base Register) is stored at
+ offset 1Ch in the TSS. */
+ cr3 = _farnspeekl (taskbase + 0x1c) & ~0xfff;
+ if (cr3 > 0xfffff)
+ {
+#if 0 /* Not fully supported yet. */
+ /* The Page Directory is in UMBs. In that case, CWSDPMI puts
+ the first Page Table right below the Page Directory. Thus,
+ the first Page Table's entry for its own address and the Page
+ Directory entry for that Page Table will hold the same
+ physical address. The loop below searches the entire UMB
+ range of addresses for such an occurrence. */
+ unsigned long addr, pte_idx;
+
+ for (addr = 0xb0000, pte_idx = 0xb0;
+ pte_idx < 0xff;
+ addr += 0x1000, pte_idx++)
+ {
+ if (((_farnspeekl (addr + 4 * pte_idx) & 0xfffff027) ==
+ (_farnspeekl (addr + 0x1000) & 0xfffff027))
+ && ((_farnspeekl (addr + 4 * pte_idx + 4) & 0xfffff000) == cr3))
+ {
+ cr3 = addr + 0x1000;
+ break;
+ }
+ }
+#endif
+
+ if (cr3 > 0xfffff)
+ cr3 = 0;
+ }
+
+ return cr3;
}
+/* Return the N'th Page Directory entry. */
+static unsigned long
+get_pde (int n)
+{
+ unsigned long pde = 0;
-static int inf_mode_valid = 0;
-static int inf_terminal_mode;
+ if (pdbr && n >= 0 && n < 1024)
+ {
+ pde = _farpeekl (_dos_ds, pdbr + 4*n);
+ }
+ return pde;
+}
-/* This semaphore is needed because, amazingly enough, GDB calls
- target.to_terminal_ours more than once after the inferior stops.
- But we need the information from the first call only, since the
- second call will always see GDB's own cooked terminal. */
-static int terminal_is_ours = 1;
+/* Return the N'th entry of the Page Table whose Page Directory entry
+ is PDE. */
+static unsigned long
+get_pte (unsigned long pde, int n)
+{
+ unsigned long pte = 0;
+ /* pde & 0x80 tests the 4MB page bit. We don't support 4MB
+ page tables, for now. */
+ if ((pde & 1) && !(pde & 0x80) && n >= 0 && n < 1024)
+ {
+ pde &= ~0xfff; /* Clear non-address bits. */
+ pte = _farpeekl (_dos_ds, pde + 4*n);
+ }
+ return pte;
+}
+
+/* Display a Page Directory or Page Table entry. IS_DIR, if non-zero,
+ says this is a Page Directory entry. If FORCE is non-zero, display
+ the entry even if its Present flag is off. OFF is the offset of the
+ address from the page's base address. */
static void
-go32_terminal_init (void)
+display_ptable_entry (unsigned long entry, int is_dir, int force, unsigned off)
{
- inf_mode_valid = 0; /* reinitialize, in case they are restarting child */
- terminal_is_ours = 1;
+ if ((entry & 1) != 0)
+ {
+ printf_filtered ("Base=0x%05lx000", entry >> 12);
+ if ((entry & 0x100) && !is_dir)
+ puts_filtered (" Global");
+ if ((entry & 0x40) && !is_dir)
+ puts_filtered (" Dirty");
+ printf_filtered (" %sAcc.", (entry & 0x20) ? "" : "Not-");
+ printf_filtered (" %sCached", (entry & 0x10) ? "" : "Not-");
+ printf_filtered (" Write-%s", (entry & 8) ? "Thru" : "Back");
+ printf_filtered (" %s", (entry & 4) ? "Usr" : "Sup");
+ printf_filtered (" Read-%s", (entry & 2) ? "Write" : "Only");
+ if (off)
+ printf_filtered (" +0x%x", off);
+ puts_filtered ("\n");
+ }
+ else if (force)
+ printf_filtered ("Page%s not present or not supported; value=0x%lx.\n",
+ is_dir ? " Table" : "", entry >> 1);
}
static void
-go32_terminal_info (char *args, int from_tty)
+go32_pde (const char *arg, int from_tty)
{
- printf_unfiltered ("Inferior's terminal is in %s mode.\n",
- !inf_mode_valid
- ? "default" : inf_terminal_mode ? "raw" : "cooked");
+ long pde_idx = -1, i;
-#if __DJGPP_MINOR__ > 2
- if (child_cmd.redirection)
- {
- int i;
-
- for (i = 0; i < DBG_HANDLES; i++)
+ if (arg && *arg)
{
- if (child_cmd.redirection[i]->file_name)
- printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n",
- i, child_cmd.redirection[i]->file_name);
- else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1)
- printf_unfiltered
- ("\tFile handle %d appears to be closed by inferior.\n", i);
- /* Mask off the raw/cooked bit when comparing device info words. */
- else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf)
- != (_get_dev_info (i) & 0xdf))
- printf_unfiltered
- ("\tFile handle %d appears to be redirected by inferior.\n", i);
+ arg = skip_spaces (arg);
+
+ if (*arg)
+ {
+ pde_idx = parse_and_eval_long (arg);
+ if (pde_idx < 0 || pde_idx >= 1024)
+ error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx);
+ }
}
- }
-#endif
+
+ pdbr = get_cr3 ();
+ if (!pdbr)
+ puts_filtered ("Access to Page Directories is "
+ "not supported on this system.\n");
+ else if (pde_idx >= 0)
+ display_ptable_entry (get_pde (pde_idx), 1, 1, 0);
+ else
+ for (i = 0; i < 1024; i++)
+ display_ptable_entry (get_pde (i), 1, 0, 0);
}
+/* A helper function to display entries in a Page Table pointed to by
+ the N'th entry in the Page Directory. If FORCE is non-zero, say
+ something even if the Page Table is not accessible. */
static void
-go32_terminal_inferior (void)
+display_page_table (long n, int force)
{
- /* Redirect standard handles as child wants them. */
- errno = 0;
- if (redir_to_child (&child_cmd) == -1)
- {
- redir_to_debugger (&child_cmd);
- error ("Cannot redirect standard handles for program: %s.",
- strerror (errno));
- }
- /* set the console device of the inferior to whatever mode
- (raw or cooked) we found it last time */
- if (terminal_is_ours)
- {
- if (inf_mode_valid)
- device_mode (0, inf_terminal_mode);
- terminal_is_ours = 0;
- }
+ unsigned long pde = get_pde (n);
+
+ if ((pde & 1) != 0)
+ {
+ int i;
+
+ printf_filtered ("Page Table pointed to by "
+ "Page Directory entry 0x%lx:\n", n);
+ for (i = 0; i < 1024; i++)
+ display_ptable_entry (get_pte (pde, i), 0, 0, 0);
+ puts_filtered ("\n");
+ }
+ else if (force)
+ printf_filtered ("Page Table not present; value=0x%lx.\n", pde >> 1);
}
static void
-go32_terminal_ours (void)
+go32_pte (const char *arg, int from_tty)
{
- /* Switch to cooked mode on the gdb terminal and save the inferior
- terminal mode to be restored when it is resumed */
- if (!terminal_is_ours)
- {
- inf_terminal_mode = device_mode (0, 0);
- if (inf_terminal_mode != -1)
- inf_mode_valid = 1;
- else
- /* If device_mode returned -1, we don't know what happens with
- handle 0 anymore, so make the info invalid. */
- inf_mode_valid = 0;
- terminal_is_ours = 1;
+ long pde_idx = -1L, i;
- /* Restore debugger's standard handles. */
- errno = 0;
- if (redir_to_debugger (&child_cmd) == -1)
+ if (arg && *arg)
{
- redir_to_child (&child_cmd);
- error ("Cannot redirect standard handles for debugger: %s.",
- strerror (errno));
+ arg = skip_spaces (arg);
+
+ if (*arg)
+ {
+ pde_idx = parse_and_eval_long (arg);
+ if (pde_idx < 0 || pde_idx >= 1024)
+ error (_("Entry %ld is outside valid limits [0..1023]."), pde_idx);
+ }
}
- }
+
+ pdbr = get_cr3 ();
+ if (!pdbr)
+ puts_filtered ("Access to Page Tables is not supported on this system.\n");
+ else if (pde_idx >= 0)
+ display_page_table (pde_idx, 1);
+ else
+ for (i = 0; i < 1024; i++)
+ display_page_table (i, 0);
}
static void
-init_go32_ops (void)
+go32_pte_for_address (const char *arg, int from_tty)
{
- go32_ops.to_shortname = "djgpp";
- go32_ops.to_longname = "djgpp target process";
- go32_ops.to_doc =
- "Program loaded by djgpp, when gdb is used as an external debugger";
- go32_ops.to_open = go32_open;
- go32_ops.to_close = go32_close;
- go32_ops.to_attach = go32_attach;
- go32_ops.to_detach = go32_detach;
- go32_ops.to_resume = go32_resume;
- go32_ops.to_wait = go32_wait;
- go32_ops.to_fetch_registers = go32_fetch_registers;
- go32_ops.to_store_registers = go32_store_registers;
- go32_ops.to_prepare_to_store = go32_prepare_to_store;
- go32_ops.to_xfer_memory = go32_xfer_memory;
- go32_ops.to_files_info = go32_files_info;
- go32_ops.to_insert_breakpoint = memory_insert_breakpoint;
- go32_ops.to_remove_breakpoint = memory_remove_breakpoint;
- go32_ops.to_terminal_init = go32_terminal_init;
- go32_ops.to_terminal_inferior = go32_terminal_inferior;
- go32_ops.to_terminal_ours_for_output = go32_terminal_ours;
- go32_ops.to_terminal_ours = go32_terminal_ours;
- go32_ops.to_terminal_info = go32_terminal_info;
- go32_ops.to_kill = go32_kill_inferior;
- go32_ops.to_create_inferior = go32_create_inferior;
- go32_ops.to_mourn_inferior = go32_mourn_inferior;
- go32_ops.to_can_run = go32_can_run;
- go32_ops.to_stop = go32_stop;
- go32_ops.to_stratum = process_stratum;
- go32_ops.to_has_all_memory = 1;
- go32_ops.to_has_memory = 1;
- go32_ops.to_has_stack = 1;
- go32_ops.to_has_registers = 1;
- go32_ops.to_has_execution = 1;
- go32_ops.to_magic = OPS_MAGIC;
-
- /* Initialize child's cwd with the current one. */
- getcwd (child_cwd, sizeof (child_cwd));
+ CORE_ADDR addr = 0, i;
- /* Initialize child's command line storage. */
- if (redir_debug_init (&child_cmd) == -1)
- internal_error ("Cannot allocate redirection storage: not enough memory.\n");
+ if (arg && *arg)
+ {
+ arg = skip_spaces (arg);
+
+ if (*arg)
+ addr = parse_and_eval_address (arg);
+ }
+ if (!addr)
+ error_no_arg (_("linear address"));
+
+ pdbr = get_cr3 ();
+ if (!pdbr)
+ puts_filtered ("Access to Page Tables is not supported on this system.\n");
+ else
+ {
+ int pde_idx = (addr >> 22) & 0x3ff;
+ int pte_idx = (addr >> 12) & 0x3ff;
+ unsigned offs = addr & 0xfff;
+
+ printf_filtered ("Page Table entry for address %s:\n",
+ hex_string(addr));
+ display_ptable_entry (get_pte (get_pde (pde_idx), pte_idx), 0, 1, offs);
+ }
+}
+
+static struct cmd_list_element *info_dos_cmdlist = NULL;
+
+static void
+go32_info_dos_command (const char *args, int from_tty)
+{
+ help_list (info_dos_cmdlist, "info dos ", class_info, gdb_stdout);
}
void
_initialize_go32_nat (void)
{
- init_go32_ops ();
- add_target (&go32_ops);
+ x86_dr_low.set_control = go32_set_dr7;
+ x86_dr_low.set_addr = go32_set_dr;
+ x86_dr_low.get_status = go32_get_dr6;
+ x86_dr_low.get_control = go32_get_dr7;
+ x86_dr_low.get_addr = go32_get_dr;
+ x86_set_debug_register_length (4);
+
+ add_inf_child_target (&the_go32_nat_target);
+
+ /* Initialize child's cwd as empty to be initialized when starting
+ the child. */
+ *child_cwd = 0;
+
+ /* Initialize child's command line storage. */
+ if (redir_debug_init (&child_cmd) == -1)
+ internal_error (__FILE__, __LINE__,
+ _("Cannot allocate redirection storage: "
+ "not enough memory.\n"));
+
+ /* We are always processing GCC-compiled programs. */
+ processing_gcc_compilation = 2;
+
+ add_prefix_cmd ("dos", class_info, go32_info_dos_command, _("\
+Print information specific to DJGPP (aka MS-DOS) debugging."),
+ &info_dos_cmdlist, "info dos ", 0, &infolist);
+
+ add_cmd ("sysinfo", class_info, go32_sysinfo, _("\
+Display information about the target system, including CPU, OS, DPMI, etc."),
+ &info_dos_cmdlist);
+ add_cmd ("ldt", class_info, go32_sldt, _("\
+Display entries in the LDT (Local Descriptor Table).\n\
+Entry number (an expression) as an argument means display only that entry."),
+ &info_dos_cmdlist);
+ add_cmd ("gdt", class_info, go32_sgdt, _("\
+Display entries in the GDT (Global Descriptor Table).\n\
+Entry number (an expression) as an argument means display only that entry."),
+ &info_dos_cmdlist);
+ add_cmd ("idt", class_info, go32_sidt, _("\
+Display entries in the IDT (Interrupt Descriptor Table).\n\
+Entry number (an expression) as an argument means display only that entry."),
+ &info_dos_cmdlist);
+ add_cmd ("pde", class_info, go32_pde, _("\
+Display entries in the Page Directory.\n\
+Entry number (an expression) as an argument means display only that entry."),
+ &info_dos_cmdlist);
+ add_cmd ("pte", class_info, go32_pte, _("\
+Display entries in Page Tables.\n\
+Entry number (an expression) as an argument means display only entries\n\
+from the Page Table pointed to by the specified Page Directory entry."),
+ &info_dos_cmdlist);
+ add_cmd ("address-pte", class_info, go32_pte_for_address, _("\
+Display a Page Table entry for a linear address.\n\
+The address argument must be a linear address, after adding to\n\
+it the base address of the appropriate segment.\n\
+The base address of variables and functions in the debuggee's data\n\
+or code segment is stored in the variable __djgpp_base_address,\n\
+so use `__djgpp_base_address + (char *)&var' as the argument.\n\
+For other segments, look up their base address in the output of\n\
+the `info dos ldt' command."),
+ &info_dos_cmdlist);
}
pid_t
projects / deliverable / binutils-gdb.git / blobdiff