345 lines
8.5 KiB
C
345 lines
8.5 KiB
C
/* Low level interface to ptrace, for the remote server for GDB.
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Copyright (C) 1986, 1987, 1993 Free Software Foundation, Inc.
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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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "server.h"
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#include "frame.h"
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#include "inferior.h"
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#include <stdio.h>
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#include <sys/param.h>
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#include <sys/dir.h>
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#define LYNXOS
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#include <sys/mem.h>
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#include <sys/signal.h>
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#include <sys/file.h>
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#include <sys/kernel.h>
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#include <sys/itimer.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/proc.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <sgtty.h>
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#include <fcntl.h>
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#include "/usr/include/wait.h"
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char registers[REGISTER_BYTES];
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#include <sys/ptrace.h>
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/* Start an inferior process and returns its pid.
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ALLARGS is a vector of program-name and args. */
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int
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create_inferior (program, allargs)
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char *program;
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char **allargs;
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{
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int pid;
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pid = fork ();
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if (pid < 0)
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perror_with_name ("fork");
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if (pid == 0)
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{
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int pgrp;
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/* Switch child to it's own process group so that signals won't
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directly affect gdbserver. */
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pgrp = getpid();
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setpgrp(0, pgrp);
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ioctl (0, TIOCSPGRP, &pgrp);
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ptrace (PTRACE_TRACEME);
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execv (program, allargs);
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fprintf (stderr, "GDBserver (process %d): Cannot exec %s: %s.\n",
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getpid(), program,
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errno < sys_nerr ? sys_errlist[errno] : "unknown error");
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fflush (stderr);
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_exit (0177);
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}
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return pid;
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}
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/* Kill the inferior process. Make us have no inferior. */
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void
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kill_inferior ()
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{
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if (inferior_pid == 0)
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return;
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ptrace (PTRACE_KILL, inferior_pid, 0, 0);
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wait (0);
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inferior_pid = 0;
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}
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/* Wait for process, returns status */
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unsigned char
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mywait (status)
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char *status;
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{
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int pid;
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union wait w;
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enable_async_io();
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pid = wait (&w);
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disable_async_io();
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if (pid != PIDGET(inferior_pid))
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perror_with_name ("wait");
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inferior_pid = BUILDPID (inferior_pid, w.w_tid);
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if (WIFEXITED (w))
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{
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fprintf (stderr, "\nChild exited with status %d\n", WEXITSTATUS (w));
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fprintf (stderr, "GDBserver exiting\n");
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exit (0);
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}
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else if (!WIFSTOPPED (w))
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{
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fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
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*status = 'T';
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return ((unsigned char) WTERMSIG (w));
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}
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fetch_inferior_registers (0);
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*status = 'S';
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return ((unsigned char) WSTOPSIG (w));
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}
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/* Resume execution of the inferior process.
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If STEP is nonzero, single-step it.
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If SIGNAL is nonzero, give it that signal. */
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void
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myresume (step, signal)
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int step;
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int signal;
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{
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errno = 0;
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ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal);
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if (errno)
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perror_with_name ("ptrace");
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}
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#undef offsetof
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#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
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static struct econtext *
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lynx_registers_addr()
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{
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st_t *stblock;
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int ecpoff = offsetof(st_t, ecp);
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CORE_ADDR ecp;
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errno = 0;
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stblock = (st_t *) ptrace (PTRACE_THREADUSER, inferior_pid,
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(PTRACE_ARG3_TYPE)0, 0);
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if (errno)
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perror_with_name ("PTRACE_THREADUSER");
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ecp = (CORE_ADDR) ptrace (PTRACE_PEEKTHREAD, inferior_pid,
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(PTRACE_ARG3_TYPE)ecpoff, 0);
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ecp -= (CORE_ADDR)stblock;
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if (errno)
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perror_with_name ("lynx_registers_addr(PTRACE_PEEKTHREAD)");
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return (struct econtext *)ecp;
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}
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static struct econtext *ecp;
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/* Mapping between GDB register #s and offsets into econtext. Must be
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consistent with REGISTER_NAMES macro in tm-i386v.h. */
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#define X(ENTRY)(offsetof(struct econtext, ENTRY) / 4)
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static int regmap[] = {
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X(eax),
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X(ecx),
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X(edx),
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X(ebx),
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X(esp),
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X(ebp),
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X(esi),
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X(edi),
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X(eip),
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X(flags), /* ps */
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X(cs),
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X(ss),
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X(ds),
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X(es),
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X(ecode), /* Lynx doesn't give us either fs or gs, so */
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X(fault) /* we just substitute these two in the hopes
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that they are useful. */
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};
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/* Fetch one or more registers from the inferior. REGNO == -1 to get
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them all. We actually fetch more than requested, when convenient,
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marking them as valid so we won't fetch them again. */
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void
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fetch_inferior_registers (ignored)
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int ignored;
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{
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int regno;
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unsigned long reg;
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struct econtext *ecp;
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ecp = lynx_registers_addr();
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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errno = 0;
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reg = ptrace (PTRACE_PEEKTHREAD, inferior_pid,
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(PTRACE_ARG3_TYPE) (&ecp->fault + regmap[regno]), 0);
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if (errno)
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perror_with_name ("fetch_inferior_registers(PTRACE_PEEKTHREAD)");
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*(unsigned long *)®isters[REGISTER_BYTE (regno)] = reg;
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}
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}
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/* Store our register values back into the inferior.
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If REGNO is -1, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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void
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store_inferior_registers (ignored)
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int ignored;
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{
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int regno;
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unsigned long reg;
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struct econtext *ecp;
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ecp = lynx_registers_addr();
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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reg = *(unsigned long *)®isters[REGISTER_BYTE (regno)];
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errno = 0;
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ptrace (PTRACE_POKEUSER, inferior_pid,
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(PTRACE_ARG3_TYPE) (&ecp->fault + regmap[regno]), reg);
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if (errno)
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perror_with_name ("PTRACE_POKEUSER");
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}
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}
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/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
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in the NEW_SUN_PTRACE case.
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It ought to be straightforward. But it appears that writing did
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not write the data that I specified. I cannot understand where
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it got the data that it actually did write. */
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/* Copy LEN bytes from inferior's memory starting at MEMADDR
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to debugger memory starting at MYADDR. */
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void
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read_inferior_memory (memaddr, myaddr, len)
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CORE_ADDR memaddr;
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char *myaddr;
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int len;
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{
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register int i;
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/* Round starting address down to longword boundary. */
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register CORE_ADDR addr = memaddr & -sizeof (int);
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/* Round ending address up; get number of longwords that makes. */
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register int count
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= (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
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/* Allocate buffer of that many longwords. */
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register int *buffer = (int *) alloca (count * sizeof (int));
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/* Read all the longwords */
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for (i = 0; i < count; i++, addr += sizeof (int))
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{
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buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0);
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}
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/* Copy appropriate bytes out of the buffer. */
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memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
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}
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/* Copy LEN bytes of data from debugger memory at MYADDR
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to inferior's memory at MEMADDR.
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On failure (cannot write the inferior)
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returns the value of errno. */
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int
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write_inferior_memory (memaddr, myaddr, len)
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CORE_ADDR memaddr;
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char *myaddr;
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int len;
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{
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register int i;
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/* Round starting address down to longword boundary. */
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register CORE_ADDR addr = memaddr & -sizeof (int);
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/* Round ending address up; get number of longwords that makes. */
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register int count
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= (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
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/* Allocate buffer of that many longwords. */
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register int *buffer = (int *) alloca (count * sizeof (int));
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extern int errno;
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/* Fill start and end extra bytes of buffer with existing memory data. */
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buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0);
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if (count > 1)
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{
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buffer[count - 1]
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= ptrace (PTRACE_PEEKTEXT, inferior_pid,
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addr + (count - 1) * sizeof (int), 0);
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}
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/* Copy data to be written over corresponding part of buffer */
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memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
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/* Write the entire buffer. */
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for (i = 0; i < count; i++, addr += sizeof (int))
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{
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while (1)
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{
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errno = 0;
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ptrace (PTRACE_POKETEXT, inferior_pid, addr, buffer[i]);
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if (errno)
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{
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fprintf(stderr, "ptrace (PTRACE_POKETEXT): errno=%d, inferior_pid=0x%x, addr=0x%x, buffer[i] = 0x%x\n", errno, inferior_pid, addr, buffer[i]);
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fprintf(stderr, "Sleeping for 1 second\n");
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sleep(1);
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}
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else
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break;
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}
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}
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return 0;
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}
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