c35b149212
to_has_memory, to_has_stack, to_has_registers and to_has_execution methods instead of variables. (target_has_all_memory_1, target_has_memory_1, target_has_stack_1) (target_has_registers_1, target_has_execution_1): Declare functions. (target_has_all_memory): Rewrite to call target_has_all_memory_1. (target_has_memory): Rewrite to call target_has_memory_1. (target_has_stack): Rewrite to call target_has_all_stack_1. (target_has_registers): Rewrite to call target_has_registers_1. (target_has_execution): Rewrite to call target_has_execution_1. (default_child_has_all_memory, default_child_has_memory) (default_child_has_stack, default_child_has_registers) (default_child_has_execution): Declare. (target_mark_running, target_mark_exited): Delete declarations. * target.c (default_child_has_all_memory, default_child_has_memory, default_child_has_stack, default_child_has_registers, default_child_has_execution): New. (target_has_all_memory_1, target_has_memory_1, target_has_stack_1, target_has_registers_1, target_has_execution_1): New. (add_target): Default the to_has_all_memory, to_has_all_memory, to_has_memory, to_has_stack, to_has_registers and to_has_execution callbacks to return 0. (update_current_target): Do not inherit to_has_all_memory, to_has_memory, to_has_stack, to_has_registers or to_has_execution. (target_mark_running, target_mark_exited): Delete. (memory_xfer_partial): Adjust. (target_read_memory, target_write_memory, target_search_memory): Dispatch to the the top-most target, not the flattened current_target. (target_info): Adjust. (init_dummy_target): Install return_zero as callback for to_has_all_memory, to_has_memory, to_has_stack, to_has_registers, to_has_execution. (set_maintenance_target_async_permitted): Use have_live_inferiors instead of target_has_execution. * target-memory.c (target_write_memory_blocks): Dispatch memory writes to the the top-most target, not the flattened current_target. * breakpoint.c (insert_breakpoints): Don't check for target_has_execution here. (update_global_location_list): Check if there are live inferiors to debug instead of target_has_execution. * infcmd.c (kill_command, detach_command): Check if there are inferiors instead of target_has_execution. * inferior.h (have_live_inferiors): Declare. * inferior.c (have_live_inferiors): New. * infrun.c (normal_stop): Don't check for target_has_execution to finish the thread states. * thread.c (is_thread_state, is_stopped, is_exited, is_running) (any_running, is_executing): Remove checks for target_has_execution. * top.c (kill_or_detach): Don't try to kill core inferiors. (quit_target): Don't check for target_has_execution. * corelow.c (core_has_memory, core_has_stack, core_has_registers): New. (init_core_ops): Install core_has_memory, core_has_stack and core_has_registers. * exec.c (exec_has_memory): New. (init_exec_ops): Install exec_has_memory. * remote.c (remote_add_inferior): Don't call target_mark_running. (remote_start_remote): Don't call target_mark_exited or call target_mark_running. (remote_open_1): Use have_inferiors instead of target_has_execution. Don't use target_mark_exited. (init_remote_ops): Install deafult_child_has_all_memory, default_child_has_memory, default_child_has_stack, default_child_has_registers, default_child_has_execution. * bsd-kvm.c (bsd_kvm_return_one): New. (bsd_kvm_add_target): Register bsd_kvm_return_one as to_has_memory, to_has_stack and to_has_registers callbacks. * remote-m32r-sdi.c (m32r_return_one): New. (init_m32r_ops): Register it. * inf-child.c (inf_child_target): Adjust to register default_child_has_all_memory, default_child_has_memory, default_child_has_stack, default_child_has_registers, default_child_has_execution callbacks. * gnu-nat.c (init_gnu_ops): Likewise. * go32-nat.c (init_go32_ops): Likewise. * hpux-thread.c (init_hpux_thread_ops): Likewise. * monitor.c (init_base_monitor_ops): Likewise. * nto-procfs.c (init_procfs_ops): Likewise. * remote-mips.c (_initialize_remote_mips): Likewise. * windows-nat.c (init_windows_ops): Likewise. * remote-sim.c (gdbsim_create_inferior): Don't use target_mark_running or target_mark_exited. (gdbsim_mourn_inferior): Don't call target_mark_exited. (init_gdbsim_ops): Adjust to register default_child_has_all_memory, default_child_has_memory, default_child_has_stack, default_child_has_registers, default_child_has_execution callbacks. * linux-nat.c (linux_nat_xfer_partial): If reading memory, and there's no inferior selected, defer to a lower stratum.
2125 lines
60 KiB
C
2125 lines
60 KiB
C
/* Native debugging support for Intel x86 running DJGPP.
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Copyright (C) 1997, 1999, 2000, 2001, 2005, 2006, 2007, 2008, 2009
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Free Software Foundation, Inc.
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Written by Robert Hoehne.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* To whomever it may concern, here's a general description of how
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debugging in DJGPP works, and the special quirks GDB does to
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support that.
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When the DJGPP port of GDB is debugging a DJGPP program natively,
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there aren't 2 separate processes, the debuggee and GDB itself, as
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on other systems. (This is DOS, where there can only be one active
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process at any given time, remember?) Instead, GDB and the
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debuggee live in the same process. So when GDB calls
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go32_create_inferior below, and that function calls edi_init from
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the DJGPP debug support library libdbg.a, we load the debuggee's
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executable file into GDB's address space, set it up for execution
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as the stub loader (a short real-mode program prepended to each
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DJGPP executable) normally would, and do a lot of preparations for
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swapping between GDB's and debuggee's internal state, primarily wrt
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the exception handlers. This swapping happens every time we resume
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the debuggee or switch back to GDB's code, and it includes:
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. swapping all the segment registers
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. swapping the PSP (the Program Segment Prefix)
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. swapping the signal handlers
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. swapping the exception handlers
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. swapping the FPU status
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. swapping the 3 standard file handles (more about this below)
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Then running the debuggee simply means longjmp into it where its PC
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is and let it run until it stops for some reason. When it stops,
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GDB catches the exception that stopped it and longjmp's back into
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its own code. All the possible exit points of the debuggee are
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watched; for example, the normal exit point is recognized because a
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DOS program issues a special system call to exit. If one of those
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exit points is hit, we mourn the inferior and clean up after it.
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Cleaning up is very important, even if the process exits normally,
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because otherwise we might leave behind traces of previous
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execution, and in several cases GDB itself might be left hosed,
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because all the exception handlers were not restored.
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Swapping of the standard handles (in redir_to_child and
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redir_to_debugger) is needed because, since both GDB and the
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debuggee live in the same process, as far as the OS is concerned,
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the share the same file table. This means that the standard
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handles 0, 1, and 2 point to the same file table entries, and thus
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are connected to the same devices. Therefore, if the debugger
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redirects its standard output, the standard output of the debuggee
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is also automagically redirected to the same file/device!
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Similarly, if the debuggee redirects its stdout to a file, you
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won't be able to see debugger's output (it will go to the same file
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where the debuggee has its output); and if the debuggee closes its
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standard input, you will lose the ability to talk to debugger!
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For this reason, every time the debuggee is about to be resumed, we
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call redir_to_child, which redirects the standard handles to where
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the debuggee expects them to be. When the debuggee stops and GDB
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regains control, we call redir_to_debugger, which redirects those 3
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handles back to where GDB expects.
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Note that only the first 3 handles are swapped, so if the debuggee
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redirects or closes any other handles, GDB will not notice. In
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particular, the exit code of a DJGPP program forcibly closes all
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file handles beyond the first 3 ones, so when the debuggee exits,
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GDB currently loses its stdaux and stdprn streams. Fortunately,
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GDB does not use those as of this writing, and will never need
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to. */
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#include <fcntl.h>
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#include "defs.h"
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#include "i386-nat.h"
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#include "inferior.h"
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#include "gdbthread.h"
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#include "gdb_wait.h"
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#include "gdbcore.h"
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#include "command.h"
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#include "gdbcmd.h"
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#include "floatformat.h"
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#include "buildsym.h"
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#include "i387-tdep.h"
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#include "i386-tdep.h"
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#include "value.h"
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#include "regcache.h"
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#include "gdb_string.h"
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#include "top.h"
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#include <stdio.h> /* might be required for __DJGPP_MINOR__ */
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/utsname.h>
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#include <io.h>
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#include <dos.h>
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#include <dpmi.h>
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#include <go32.h>
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#include <sys/farptr.h>
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#include <debug/v2load.h>
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#include <debug/dbgcom.h>
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#if __DJGPP_MINOR__ > 2
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#include <debug/redir.h>
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#endif
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#include <langinfo.h>
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#if __DJGPP_MINOR__ < 3
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/* This code will be provided from DJGPP 2.03 on. Until then I code it
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here */
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typedef struct
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{
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unsigned short sig0;
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unsigned short sig1;
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unsigned short sig2;
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unsigned short sig3;
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unsigned short exponent:15;
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unsigned short sign:1;
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}
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NPXREG;
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typedef struct
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{
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unsigned int control;
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unsigned int status;
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unsigned int tag;
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unsigned int eip;
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unsigned int cs;
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unsigned int dataptr;
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unsigned int datasel;
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NPXREG reg[8];
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}
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NPX;
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static NPX npx;
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static void save_npx (void); /* Save the FPU of the debugged program */
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static void load_npx (void); /* Restore the FPU of the debugged program */
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/* ------------------------------------------------------------------------- */
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/* Store the contents of the NPX in the global variable `npx'. */
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/* *INDENT-OFF* */
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static void
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save_npx (void)
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{
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asm ("inb $0xa0, %%al \n\
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testb $0x20, %%al \n\
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jz 1f \n\
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xorb %%al, %%al \n\
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outb %%al, $0xf0 \n\
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movb $0x20, %%al \n\
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outb %%al, $0xa0 \n\
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outb %%al, $0x20 \n\
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1: \n\
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fnsave %0 \n\
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fwait "
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: "=m" (npx)
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: /* No input */
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: "%eax");
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}
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/* *INDENT-ON* */
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/* ------------------------------------------------------------------------- */
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/* Reload the contents of the NPX from the global variable `npx'. */
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static void
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load_npx (void)
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{
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asm ("frstor %0":"=m" (npx));
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}
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/* ------------------------------------------------------------------------- */
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/* Stubs for the missing redirection functions. */
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typedef struct {
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char *command;
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int redirected;
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} cmdline_t;
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void
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redir_cmdline_delete (cmdline_t *ptr)
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{
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ptr->redirected = 0;
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}
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int
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redir_cmdline_parse (const char *args, cmdline_t *ptr)
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{
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return -1;
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}
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int
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redir_to_child (cmdline_t *ptr)
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{
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return 1;
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}
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int
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redir_to_debugger (cmdline_t *ptr)
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{
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return 1;
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}
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int
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redir_debug_init (cmdline_t *ptr)
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{
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return 0;
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}
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#endif /* __DJGPP_MINOR < 3 */
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typedef enum { wp_insert, wp_remove, wp_count } wp_op;
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/* This holds the current reference counts for each debug register. */
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static int dr_ref_count[4];
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#define SOME_PID 42
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static int prog_has_started = 0;
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static void go32_open (char *name, int from_tty);
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static void go32_close (int quitting);
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static void go32_attach (struct target_ops *ops, char *args, int from_tty);
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static void go32_detach (struct target_ops *ops, char *args, int from_tty);
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static void go32_resume (struct target_ops *ops,
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ptid_t ptid, int step,
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enum target_signal siggnal);
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static void go32_fetch_registers (struct target_ops *ops,
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struct regcache *, int regno);
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static void store_register (const struct regcache *, int regno);
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static void go32_store_registers (struct target_ops *ops,
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struct regcache *, int regno);
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static void go32_prepare_to_store (struct regcache *);
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static int go32_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len,
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int write,
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struct mem_attrib *attrib,
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struct target_ops *target);
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static void go32_files_info (struct target_ops *target);
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static void go32_kill_inferior (struct target_ops *ops);
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static void go32_create_inferior (struct target_ops *ops, char *exec_file,
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char *args, char **env, int from_tty);
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static void go32_mourn_inferior (struct target_ops *ops);
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static int go32_can_run (void);
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static struct target_ops go32_ops;
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static void go32_terminal_init (void);
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static void go32_terminal_inferior (void);
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static void go32_terminal_ours (void);
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#define r_ofs(x) (offsetof(TSS,x))
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static struct
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{
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size_t tss_ofs;
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size_t size;
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}
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regno_mapping[] =
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{
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{r_ofs (tss_eax), 4}, /* normal registers, from a_tss */
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{r_ofs (tss_ecx), 4},
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{r_ofs (tss_edx), 4},
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{r_ofs (tss_ebx), 4},
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{r_ofs (tss_esp), 4},
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{r_ofs (tss_ebp), 4},
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{r_ofs (tss_esi), 4},
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{r_ofs (tss_edi), 4},
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{r_ofs (tss_eip), 4},
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{r_ofs (tss_eflags), 4},
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{r_ofs (tss_cs), 2},
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{r_ofs (tss_ss), 2},
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{r_ofs (tss_ds), 2},
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{r_ofs (tss_es), 2},
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{r_ofs (tss_fs), 2},
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{r_ofs (tss_gs), 2},
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{0, 10}, /* 8 FP registers, from npx.reg[] */
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{1, 10},
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{2, 10},
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{3, 10},
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{4, 10},
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{5, 10},
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{6, 10},
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{7, 10},
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/* The order of the next 7 registers must be consistent
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with their numbering in config/i386/tm-i386.h, which see. */
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{0, 2}, /* control word, from npx */
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{4, 2}, /* status word, from npx */
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{8, 2}, /* tag word, from npx */
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{16, 2}, /* last FP exception CS from npx */
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{12, 4}, /* last FP exception EIP from npx */
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{24, 2}, /* last FP exception operand selector from npx */
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{20, 4}, /* last FP exception operand offset from npx */
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{18, 2} /* last FP opcode from npx */
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};
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static struct
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{
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int go32_sig;
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enum target_signal gdb_sig;
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}
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sig_map[] =
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{
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{0, TARGET_SIGNAL_FPE},
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{1, TARGET_SIGNAL_TRAP},
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/* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL,
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but I think SIGBUS is better, since the NMI is usually activated
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as a result of a memory parity check failure. */
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{2, TARGET_SIGNAL_BUS},
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{3, TARGET_SIGNAL_TRAP},
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{4, TARGET_SIGNAL_FPE},
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{5, TARGET_SIGNAL_SEGV},
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{6, TARGET_SIGNAL_ILL},
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{7, TARGET_SIGNAL_EMT}, /* no-coprocessor exception */
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{8, TARGET_SIGNAL_SEGV},
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{9, TARGET_SIGNAL_SEGV},
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{10, TARGET_SIGNAL_BUS},
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{11, TARGET_SIGNAL_SEGV},
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{12, TARGET_SIGNAL_SEGV},
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{13, TARGET_SIGNAL_SEGV},
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{14, TARGET_SIGNAL_SEGV},
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{16, TARGET_SIGNAL_FPE},
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{17, TARGET_SIGNAL_BUS},
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{31, TARGET_SIGNAL_ILL},
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{0x1b, TARGET_SIGNAL_INT},
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{0x75, TARGET_SIGNAL_FPE},
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{0x78, TARGET_SIGNAL_ALRM},
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{0x79, TARGET_SIGNAL_INT},
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{0x7a, TARGET_SIGNAL_QUIT},
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{-1, TARGET_SIGNAL_LAST}
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};
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static struct {
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enum target_signal gdb_sig;
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int djgpp_excepno;
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} excepn_map[] = {
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{TARGET_SIGNAL_0, -1},
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{TARGET_SIGNAL_ILL, 6}, /* Invalid Opcode */
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{TARGET_SIGNAL_EMT, 7}, /* triggers SIGNOFP */
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{TARGET_SIGNAL_SEGV, 13}, /* GPF */
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{TARGET_SIGNAL_BUS, 17}, /* Alignment Check */
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/* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for
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details. */
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{TARGET_SIGNAL_TERM, 0x1b}, /* triggers Ctrl-Break type of SIGINT */
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{TARGET_SIGNAL_FPE, 0x75},
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{TARGET_SIGNAL_INT, 0x79},
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{TARGET_SIGNAL_QUIT, 0x7a},
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{TARGET_SIGNAL_ALRM, 0x78}, /* triggers SIGTIMR */
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{TARGET_SIGNAL_PROF, 0x78},
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{TARGET_SIGNAL_LAST, -1}
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};
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static void
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go32_open (char *name, int from_tty)
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{
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printf_unfiltered ("Done. Use the \"run\" command to run the program.\n");
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}
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static void
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go32_close (int quitting)
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{
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}
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static void
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go32_attach (struct target_ops *ops, char *args, int from_tty)
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{
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error (_("\
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You cannot attach to a running program on this platform.\n\
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Use the `run' command to run DJGPP programs."));
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}
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static void
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go32_detach (struct target_ops *ops, char *args, int from_tty)
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{
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}
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static int resume_is_step;
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static int resume_signal = -1;
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|
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static void
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go32_resume (struct target_ops *ops,
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ptid_t ptid, int step, enum target_signal siggnal)
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{
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int i;
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resume_is_step = step;
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|
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if (siggnal != TARGET_SIGNAL_0 && siggnal != TARGET_SIGNAL_TRAP)
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{
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for (i = 0, resume_signal = -1;
|
|
excepn_map[i].gdb_sig != TARGET_SIGNAL_LAST; i++)
|
|
if (excepn_map[i].gdb_sig == siggnal)
|
|
{
|
|
resume_signal = excepn_map[i].djgpp_excepno;
|
|
break;
|
|
}
|
|
if (resume_signal == -1)
|
|
printf_unfiltered ("Cannot deliver signal %s on this platform.\n",
|
|
target_signal_to_name (siggnal));
|
|
}
|
|
}
|
|
|
|
static char child_cwd[FILENAME_MAX];
|
|
|
|
static ptid_t
|
|
go32_wait (struct target_ops *ops,
|
|
ptid_t ptid, struct target_waitstatus *status, int options)
|
|
{
|
|
int i;
|
|
unsigned char saved_opcode;
|
|
unsigned long INT3_addr = 0;
|
|
int stepping_over_INT = 0;
|
|
|
|
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
|
|
them specially. Intel manuals say that these instructions
|
|
reset the single-step flag (a.k.a. TF). However, it seems
|
|
that, at least in the DPMI environment, and at least when
|
|
stepping over the DPMI interrupt 31h, the problem is having
|
|
TF set at all when INT 31h is executed: the debuggee either
|
|
crashes (and takes the system with it) or is killed by a
|
|
SIGTRAP.
|
|
|
|
So we need to emulate single-step mode: we put an INT3 opcode
|
|
right after the INT xx instruction, let the debuggee run
|
|
until it hits INT3 and stops, then restore the original
|
|
instruction which we overwrote with the INT3 opcode, and back
|
|
up the debuggee's EIP to that instruction. */
|
|
read_child (a_tss.tss_eip, &saved_opcode, 1);
|
|
if (saved_opcode == 0xCD || saved_opcode == 0xCE)
|
|
{
|
|
unsigned char INT3_opcode = 0xCC;
|
|
|
|
INT3_addr
|
|
= saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1;
|
|
stepping_over_INT = 1;
|
|
read_child (INT3_addr, &saved_opcode, 1);
|
|
write_child (INT3_addr, &INT3_opcode, 1);
|
|
}
|
|
else
|
|
a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */
|
|
}
|
|
|
|
/* The special value FFFFh in tss_trap indicates to run_child that
|
|
tss_irqn holds a signal to be delivered to the debuggee. */
|
|
if (resume_signal <= -1)
|
|
{
|
|
a_tss.tss_trap = 0;
|
|
a_tss.tss_irqn = 0xff;
|
|
}
|
|
else
|
|
{
|
|
a_tss.tss_trap = 0xffff; /* run_child looks for this */
|
|
a_tss.tss_irqn = resume_signal;
|
|
}
|
|
|
|
/* The child might change working directory behind our back. The
|
|
GDB users won't like the side effects of that when they work with
|
|
relative file names, and GDB might be confused by its current
|
|
directory not being in sync with the truth. So we always make a
|
|
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
|
|
load_npx ();
|
|
#endif
|
|
run_child ();
|
|
#if __DJGPP_MINOR__ < 3
|
|
save_npx ();
|
|
#endif
|
|
|
|
/* Did we step over an INT xx instruction? */
|
|
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 */
|
|
write_child (a_tss.tss_eip, &saved_opcode, 1);
|
|
/* Simulate a TRAP exception. */
|
|
a_tss.tss_irqn = 1;
|
|
a_tss.tss_eflags |= 0x0100;
|
|
}
|
|
|
|
getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */
|
|
chdir (current_directory);
|
|
|
|
if (a_tss.tss_irqn == 0x21)
|
|
{
|
|
status->kind = TARGET_WAITKIND_EXITED;
|
|
status->value.integer = a_tss.tss_eax & 0xff;
|
|
}
|
|
else
|
|
{
|
|
status->value.sig = TARGET_SIGNAL_UNKNOWN;
|
|
status->kind = TARGET_WAITKIND_STOPPED;
|
|
for (i = 0; sig_map[i].go32_sig != -1; i++)
|
|
{
|
|
if (a_tss.tss_irqn == sig_map[i].go32_sig)
|
|
{
|
|
#if __DJGPP_MINOR__ < 3
|
|
if ((status->value.sig = sig_map[i].gdb_sig) !=
|
|
TARGET_SIGNAL_TRAP)
|
|
status->kind = TARGET_WAITKIND_SIGNALLED;
|
|
#else
|
|
status->value.sig = sig_map[i].gdb_sig;
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return pid_to_ptid (SOME_PID);
|
|
}
|
|
|
|
static void
|
|
fetch_register (struct regcache *regcache, int regno)
|
|
{
|
|
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
|
if (regno < gdbarch_fp0_regnum (gdbarch))
|
|
regcache_raw_supply (regcache, 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);
|
|
}
|
|
|
|
static void
|
|
go32_fetch_registers (struct target_ops *ops,
|
|
struct regcache *regcache, int regno)
|
|
{
|
|
if (regno >= 0)
|
|
fetch_register (regcache, regno);
|
|
else
|
|
{
|
|
for (regno = 0;
|
|
regno < gdbarch_fp0_regnum (get_regcache_arch (regcache));
|
|
regno++)
|
|
fetch_register (regcache, regno);
|
|
i387_supply_fsave (regcache, -1, &npx);
|
|
}
|
|
}
|
|
|
|
static void
|
|
store_register (const struct regcache *regcache, int regno)
|
|
{
|
|
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
|
if (regno < gdbarch_fp0_regnum (gdbarch))
|
|
regcache_raw_collect (regcache, 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 (__FILE__, __LINE__,
|
|
_("Invalid register no. %d in store_register."), regno);
|
|
}
|
|
|
|
static void
|
|
go32_store_registers (struct target_ops *ops,
|
|
struct regcache *regcache, int regno)
|
|
{
|
|
unsigned r;
|
|
|
|
if (regno >= 0)
|
|
store_register (regcache, regno);
|
|
else
|
|
{
|
|
for (r = 0; r < gdbarch_fp0_regnum (get_regcache_arch (regcache)); r++)
|
|
store_register (regcache, r);
|
|
i387_collect_fsave (regcache, -1, &npx);
|
|
}
|
|
}
|
|
|
|
static void
|
|
go32_prepare_to_store (struct regcache *regcache)
|
|
{
|
|
}
|
|
|
|
static int
|
|
go32_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, int write,
|
|
struct mem_attrib *attrib, struct target_ops *target)
|
|
{
|
|
if (write)
|
|
{
|
|
if (write_child (memaddr, myaddr, len))
|
|
{
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
return len;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (read_child (memaddr, myaddr, len))
|
|
{
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
return len;
|
|
}
|
|
}
|
|
}
|
|
|
|
static cmdline_t child_cmd; /* parsed child's command line kept here */
|
|
|
|
static void
|
|
go32_files_info (struct target_ops *target)
|
|
{
|
|
printf_unfiltered ("You are running a DJGPP V2 program.\n");
|
|
}
|
|
|
|
static void
|
|
go32_kill_inferior (struct target_ops *ops)
|
|
{
|
|
go32_mourn_inferior (ops);
|
|
}
|
|
|
|
static void
|
|
go32_create_inferior (struct target_ops *ops, char *exec_file,
|
|
char *args, char **env, int from_tty)
|
|
{
|
|
extern char **environ;
|
|
jmp_buf start_state;
|
|
char *cmdline;
|
|
char **env_save = environ;
|
|
size_t cmdlen;
|
|
|
|
/* 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);
|
|
|
|
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 (__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."));
|
|
}
|
|
else
|
|
child_cmd.command = xstrdup (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 = xmalloc (cmdlen + 4);
|
|
strcpy (cmdline + 1, args);
|
|
/* 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);
|
|
}
|
|
environ = env_save;
|
|
xfree (cmdline);
|
|
|
|
edi_init (start_state);
|
|
#if __DJGPP_MINOR__ < 3
|
|
save_npx ();
|
|
#endif
|
|
|
|
inferior_ptid = pid_to_ptid (SOME_PID);
|
|
add_inferior_silent (SOME_PID);
|
|
|
|
push_target (&go32_ops);
|
|
|
|
add_thread_silent (inferior_ptid);
|
|
|
|
clear_proceed_status ();
|
|
insert_breakpoints ();
|
|
prog_has_started = 1;
|
|
}
|
|
|
|
static void
|
|
go32_mourn_inferior (struct target_ops *ops)
|
|
{
|
|
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,
|
|
failure to set more watchpoints, and other calamities. It would
|
|
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. */
|
|
i386_cleanup_dregs ();
|
|
|
|
ptid = inferior_ptid;
|
|
inferior_ptid = null_ptid;
|
|
delete_thread_silent (ptid);
|
|
prog_has_started = 0;
|
|
|
|
unpush_target (ops);
|
|
generic_mourn_inferior ();
|
|
}
|
|
|
|
static int
|
|
go32_can_run (void)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
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
|
|
go32_set_dr7 (unsigned long val)
|
|
{
|
|
CONTROL = val;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* 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
|
|
device_mode (int fd, int raw_p)
|
|
{
|
|
int oldmode, newmode;
|
|
__dpmi_regs regs;
|
|
|
|
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 (raw_p)
|
|
newmode |= 0x20;
|
|
else
|
|
newmode &= ~0x20;
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
static int inf_mode_valid = 0;
|
|
static int inf_terminal_mode;
|
|
|
|
/* 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;
|
|
|
|
static void
|
|
go32_terminal_init (void)
|
|
{
|
|
inf_mode_valid = 0; /* reinitialize, in case they are restarting child */
|
|
terminal_is_ours = 1;
|
|
}
|
|
|
|
static void
|
|
go32_terminal_info (char *args, int from_tty)
|
|
{
|
|
printf_unfiltered ("Inferior's terminal is in %s mode.\n",
|
|
!inf_mode_valid
|
|
? "default" : inf_terminal_mode ? "raw" : "cooked");
|
|
|
|
#if __DJGPP_MINOR__ > 2
|
|
if (child_cmd.redirection)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < DBG_HANDLES; i++)
|
|
{
|
|
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);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
go32_terminal_inferior (void)
|
|
{
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
static void
|
|
go32_terminal_ours (void)
|
|
{
|
|
/* 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));
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
go32_thread_alive (struct target_ops *ops, ptid_t ptid)
|
|
{
|
|
return !ptid_equal (inferior_ptid, null_ptid);
|
|
}
|
|
|
|
static char *
|
|
go32_pid_to_str (struct target_ops *ops, ptid_t ptid)
|
|
{
|
|
return normal_pid_to_str (ptid);
|
|
}
|
|
|
|
static void
|
|
init_go32_ops (void)
|
|
{
|
|
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.deprecated_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_thread_alive = go32_thread_alive;
|
|
go32_ops.to_pid_to_str = go32_pid_to_str;
|
|
go32_ops.to_stratum = process_stratum;
|
|
go32_ops.to_has_all_memory = default_child_has_all_memory;
|
|
go32_ops.to_has_memory = default_child_has_memory;
|
|
go32_ops.to_has_stack = default_child_has_stack;
|
|
go32_ops.to_has_registers = default_child_has_registers;
|
|
go32_ops.to_has_execution = default_child_has_execution;
|
|
|
|
i386_use_watchpoints (&go32_ops);
|
|
|
|
|
|
i386_dr_low.set_control = go32_set_dr7;
|
|
i386_dr_low.set_addr = go32_set_dr;
|
|
i386_dr_low.reset_addr = NULL;
|
|
i386_dr_low.get_status = go32_get_dr6;
|
|
i386_set_debug_register_length (4);
|
|
|
|
go32_ops.to_magic = OPS_MAGIC;
|
|
|
|
/* 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;
|
|
|
|
/* Override the default name of the GDB init file. */
|
|
strcpy (gdbinit, "gdb.ini");
|
|
}
|
|
|
|
/* Return the current DOS codepage number. */
|
|
static int
|
|
dos_codepage (void)
|
|
{
|
|
__dpmi_regs regs;
|
|
|
|
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 (item)
|
|
{
|
|
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:
|
|
retval = xstrdup ("");
|
|
break;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
unsigned short windows_major, windows_minor;
|
|
|
|
/* 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))
|
|
{
|
|
windows_major = r.h.al;
|
|
windows_minor = r.h.ah;
|
|
}
|
|
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 (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");
|
|
}
|
|
}
|
|
|
|
/* Display assorted information about the underlying OS. */
|
|
static void
|
|
go32_sysinfo (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;
|
|
|
|
cpuid_vendor[0] = '\0';
|
|
if (uname (&u))
|
|
strcpy (u.machine, "Unknown x86");
|
|
else if (u.machine[0] == 'i' && u.machine[1] > 4)
|
|
{
|
|
/* CPUID with EAX = 0 returns the Vendor ID. */
|
|
__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';
|
|
}
|
|
|
|
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 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;
|
|
unsigned cpu_family, cpu_model;
|
|
|
|
__asm__ __volatile__ ("movl $1, %%eax;"
|
|
"cpuid;"
|
|
: "=a" (cpuid_eax),
|
|
"=b" (cpuid_ebx),
|
|
"=d" (cpuid_edx)
|
|
:
|
|
: "%ecx");
|
|
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;
|
|
}
|
|
}
|
|
sprintf (cpu_string, "%s%s Model %d Stepping %d",
|
|
intel_p ? "Pentium" : (amd_p ? "AMD" : "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 && (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)
|
|
{
|
|
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 " : "");
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
/* 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)
|
|
{
|
|
unsigned long addr = table_base + idx * 8; /* 8 bytes per entry */
|
|
|
|
if (read_memory_region (addr, descr, 8))
|
|
return (int)((struct seg_descr *)descr)->stype;
|
|
return -1;
|
|
}
|
|
|
|
struct dtr_reg {
|
|
unsigned short limit __attribute__((packed));
|
|
unsigned long base __attribute__((packed));
|
|
};
|
|
|
|
/* 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)
|
|
{
|
|
struct seg_descr descr;
|
|
struct gate_descr gate;
|
|
|
|
/* 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)
|
|
{
|
|
/* 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)
|
|
{
|
|
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);
|
|
}
|
|
}
|
|
else if (force)
|
|
printf_filtered ("0x%03x: Cannot read this descriptor\n", idx);
|
|
}
|
|
|
|
static void
|
|
go32_sldt (char *arg, int from_tty)
|
|
{
|
|
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)
|
|
{
|
|
while (*arg && isspace(*arg))
|
|
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
|
|
{
|
|
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
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < max_entry; i++)
|
|
display_descriptor (ldt_descr.stype, base, i, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
go32_sgdt (char *arg, int from_tty)
|
|
{
|
|
struct dtr_reg gdtr;
|
|
long gdt_entry = -1L;
|
|
int max_entry;
|
|
|
|
if (arg && *arg)
|
|
{
|
|
while (*arg && isspace(*arg))
|
|
arg++;
|
|
|
|
if (*arg)
|
|
{
|
|
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);
|
|
}
|
|
}
|
|
|
|
__asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ );
|
|
max_entry = (gdtr.limit + 1) / 8;
|
|
|
|
if (gdt_entry >= 0)
|
|
{
|
|
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);
|
|
}
|
|
}
|
|
|
|
static void
|
|
go32_sidt (char *arg, int from_tty)
|
|
{
|
|
struct dtr_reg idtr;
|
|
long idt_entry = -1L;
|
|
int max_entry;
|
|
|
|
if (arg && *arg)
|
|
{
|
|
while (*arg && isspace(*arg))
|
|
arg++;
|
|
|
|
if (*arg)
|
|
{
|
|
idt_entry = parse_and_eval_long (arg);
|
|
if (idt_entry < 0)
|
|
error (_("Invalid (negative) IDT entry %ld."), idt_entry);
|
|
}
|
|
}
|
|
|
|
__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);
|
|
}
|
|
}
|
|
|
|
/* 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 unsigned long
|
|
get_cr3 (void)
|
|
{
|
|
unsigned offset;
|
|
unsigned taskreg;
|
|
unsigned long taskbase, cr3;
|
|
struct dtr_reg gdtr;
|
|
|
|
if (pdbr > 0 && pdbr <= 0xfffff)
|
|
return pdbr;
|
|
|
|
/* 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 */ );
|
|
|
|
/* 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 fullly 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 occurence. */
|
|
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;
|
|
|
|
if (pdbr && n >= 0 && n < 1024)
|
|
{
|
|
pde = _farpeekl (_dos_ds, pdbr + 4*n);
|
|
}
|
|
return pde;
|
|
}
|
|
|
|
/* 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
|
|
display_ptable_entry (unsigned long entry, int is_dir, int force, unsigned off)
|
|
{
|
|
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_pde (char *arg, int from_tty)
|
|
{
|
|
long pde_idx = -1, i;
|
|
|
|
if (arg && *arg)
|
|
{
|
|
while (*arg && isspace(*arg))
|
|
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 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
|
|
display_page_table (long n, int force)
|
|
{
|
|
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_pte (char *arg, int from_tty)
|
|
{
|
|
long pde_idx = -1L, i;
|
|
|
|
if (arg && *arg)
|
|
{
|
|
while (*arg && isspace(*arg))
|
|
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
|
|
go32_pte_for_address (char *arg, int from_tty)
|
|
{
|
|
CORE_ADDR addr = 0, i;
|
|
|
|
if (arg && *arg)
|
|
{
|
|
while (*arg && isspace(*arg))
|
|
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 0x%llx:\n",
|
|
(unsigned long long)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 (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);
|
|
|
|
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
|
|
tcgetpgrp (int fd)
|
|
{
|
|
if (isatty (fd))
|
|
return SOME_PID;
|
|
errno = ENOTTY;
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
tcsetpgrp (int fd, pid_t pgid)
|
|
{
|
|
if (isatty (fd) && pgid == SOME_PID)
|
|
return 0;
|
|
errno = pgid == SOME_PID ? ENOTTY : ENOSYS;
|
|
return -1;
|
|
}
|