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777 lines
18 KiB
C
777 lines
18 KiB
C
/* Low level interface to ptrace, for the remote server for GDB.
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Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002
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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., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "server.h"
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#include <sys/wait.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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#include <sys/ptrace.h>
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#include <sys/user.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <string.h>
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/***************Begin MY defs*********************/
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static char my_registers[REGISTER_BYTES];
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char *registers = my_registers;
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/***************End MY defs*********************/
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#define PTRACE_ARG3_TYPE long
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#define PTRACE_XFER_TYPE int
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extern int errno;
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static void initialize_arch (void);
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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 (char *program, 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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ptrace (PTRACE_TRACEME, 0, 0, 0);
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execv (program, allargs);
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fprintf (stderr, "Cannot exec %s: %s.\n", program,
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strerror (errno));
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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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/* Attach to an inferior process. */
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int
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myattach (int pid)
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{
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if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0)
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{
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fprintf (stderr, "Cannot attach to process %d: %s (%d)\n", pid,
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errno < sys_nerr ? sys_errlist[errno] : "unknown error",
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errno);
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fflush (stderr);
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_exit (0177);
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}
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return 0;
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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 (void)
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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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}
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/* Return nonzero if the given thread is still alive. */
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int
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mythread_alive (int pid)
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{
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return 1;
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}
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/* Wait for process, returns status */
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unsigned char
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mywait (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 = waitpid (inferior_pid, (int *)&w, 0);
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disable_async_io ();
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if (pid != inferior_pid)
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perror_with_name ("wait");
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if (WIFEXITED (w))
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{
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fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
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*status = 'W';
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return ((unsigned char) WEXITSTATUS (w));
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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 = 'X';
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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 = 'T';
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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 (int step, 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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#if !defined (offsetof)
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#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
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#endif
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/* U_REGS_OFFSET is the offset of the registers within the u area. */
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#if !defined (U_REGS_OFFSET)
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#define U_REGS_OFFSET \
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ptrace (PT_READ_U, inferior_pid, \
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(PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
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- KERNEL_U_ADDR
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#endif
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#ifdef I386_GNULINUX_TARGET
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/* This module only supports access to the general purpose registers.
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Adjust the relevant constants accordingly.
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FIXME: kettenis/2001-03-28: We should really use PTRACE_GETREGS to
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get at the registers. Better yet, we should try to share code with
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i386-linux-nat.c. */
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#undef NUM_FREGS
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#define NUM_FREGS 0
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#undef NUM_REGS
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#define NUM_REGS NUM_GREGS
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/* This stuff comes from i386-tdep.c. */
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/* i386_register_byte[i] is the offset into the register file of the
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start of register number i. We initialize this from
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i386_register_raw_size. */
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int i386_register_byte[MAX_NUM_REGS];
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/* i386_register_raw_size[i] is the number of bytes of storage in
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GDB's register array occupied by register i. */
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int i386_register_raw_size[MAX_NUM_REGS] = {
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4, 4, 4, 4,
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4, 4, 4, 4,
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4, 4, 4, 4,
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4, 4, 4, 4,
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10, 10, 10, 10,
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10, 10, 10, 10,
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4, 4, 4, 4,
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4, 4, 4, 4,
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16, 16, 16, 16,
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16, 16, 16, 16,
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4
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};
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static void
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initialize_arch (void)
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{
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/* Initialize the table saying where each register starts in the
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register file. */
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{
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int i, offset;
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offset = 0;
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for (i = 0; i < MAX_NUM_REGS; i++)
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{
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i386_register_byte[i] = offset;
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offset += i386_register_raw_size[i];
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}
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}
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}
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/* This stuff comes from i386-linux-nat.c. */
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/* Mapping between the general-purpose registers in `struct user'
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format and GDB's register array layout. */
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static int regmap[] =
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{
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EAX, ECX, EDX, EBX,
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UESP, EBP, ESI, EDI,
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EIP, EFL, CS, SS,
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DS, ES, FS, GS
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};
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/* Return the address of register REGNUM. BLOCKEND is the value of
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u.u_ar0, which should point to the registers. */
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CORE_ADDR
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register_u_addr (CORE_ADDR blockend, int regnum)
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{
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return (blockend + 4 * regmap[regnum]);
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}
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#elif defined(TARGET_M68K)
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static void
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initialize_arch (void)
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{
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return;
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}
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/* This table must line up with REGISTER_NAMES in tm-m68k.h */
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static int regmap[] =
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{
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#ifdef PT_D0
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PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,
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PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP,
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PT_SR, PT_PC,
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#else
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14, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15,
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17, 18,
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#endif
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#ifdef PT_FP0
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PT_FP0, PT_FP1, PT_FP2, PT_FP3, PT_FP4, PT_FP5, PT_FP6, PT_FP7,
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PT_FPCR, PT_FPSR, PT_FPIAR
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#else
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21, 24, 27, 30, 33, 36, 39, 42, 45, 46, 47
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#endif
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};
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/* BLOCKEND is the value of u.u_ar0, and points to the place where GS
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is stored. */
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int
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m68k_linux_register_u_addr (int blockend, int regnum)
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{
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return (blockend + 4 * regmap[regnum]);
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}
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#elif defined(IA64_GNULINUX_TARGET)
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#undef NUM_FREGS
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#define NUM_FREGS 0
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#include <asm/ptrace_offsets.h>
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static int u_offsets[] =
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{
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/* general registers */
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-1, /* gr0 not available; i.e, it's always zero */
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PT_R1,
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PT_R2,
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PT_R3,
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PT_R4,
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PT_R5,
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PT_R6,
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PT_R7,
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PT_R8,
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PT_R9,
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PT_R10,
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PT_R11,
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PT_R12,
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PT_R13,
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PT_R14,
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PT_R15,
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PT_R16,
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PT_R17,
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PT_R18,
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PT_R19,
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PT_R20,
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PT_R21,
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PT_R22,
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PT_R23,
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PT_R24,
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PT_R25,
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PT_R26,
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PT_R27,
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PT_R28,
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PT_R29,
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PT_R30,
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PT_R31,
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/* gr32 through gr127 not directly available via the ptrace interface */
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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/* Floating point registers */
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-1, -1, /* f0 and f1 not available (f0 is +0.0 and f1 is +1.0) */
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PT_F2,
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PT_F3,
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PT_F4,
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PT_F5,
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PT_F6,
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PT_F7,
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PT_F8,
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PT_F9,
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PT_F10,
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PT_F11,
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PT_F12,
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PT_F13,
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PT_F14,
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PT_F15,
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PT_F16,
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PT_F17,
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PT_F18,
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PT_F19,
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PT_F20,
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PT_F21,
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PT_F22,
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PT_F23,
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PT_F24,
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PT_F25,
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PT_F26,
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PT_F27,
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PT_F28,
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PT_F29,
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PT_F30,
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PT_F31,
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PT_F32,
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PT_F33,
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PT_F34,
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PT_F35,
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PT_F36,
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PT_F37,
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PT_F38,
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PT_F39,
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PT_F40,
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PT_F41,
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PT_F42,
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PT_F43,
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PT_F44,
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PT_F45,
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PT_F46,
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PT_F47,
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PT_F48,
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PT_F49,
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PT_F50,
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PT_F51,
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PT_F52,
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PT_F53,
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PT_F54,
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PT_F55,
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PT_F56,
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PT_F57,
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PT_F58,
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PT_F59,
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PT_F60,
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PT_F61,
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PT_F62,
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PT_F63,
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PT_F64,
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PT_F65,
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PT_F66,
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PT_F67,
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PT_F68,
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PT_F69,
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PT_F70,
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PT_F71,
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PT_F72,
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PT_F73,
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PT_F74,
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PT_F75,
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PT_F76,
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PT_F77,
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PT_F78,
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PT_F79,
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PT_F80,
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PT_F81,
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PT_F82,
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PT_F83,
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PT_F84,
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PT_F85,
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PT_F86,
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PT_F87,
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PT_F88,
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PT_F89,
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PT_F90,
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PT_F91,
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PT_F92,
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PT_F93,
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PT_F94,
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PT_F95,
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PT_F96,
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PT_F97,
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PT_F98,
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PT_F99,
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PT_F100,
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PT_F101,
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PT_F102,
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PT_F103,
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PT_F104,
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PT_F105,
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PT_F106,
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PT_F107,
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PT_F108,
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PT_F109,
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PT_F110,
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PT_F111,
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PT_F112,
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PT_F113,
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PT_F114,
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PT_F115,
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PT_F116,
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PT_F117,
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PT_F118,
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PT_F119,
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PT_F120,
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PT_F121,
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PT_F122,
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PT_F123,
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PT_F124,
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PT_F125,
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PT_F126,
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PT_F127,
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/* predicate registers - we don't fetch these individually */
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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/* branch registers */
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PT_B0,
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PT_B1,
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PT_B2,
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PT_B3,
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PT_B4,
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PT_B5,
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PT_B6,
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PT_B7,
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/* virtual frame pointer and virtual return address pointer */
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-1, -1,
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/* other registers */
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PT_PR,
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PT_CR_IIP, /* ip */
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PT_CR_IPSR, /* psr */
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PT_CFM, /* cfm */
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/* kernel registers not visible via ptrace interface (?) */
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-1, -1, -1, -1, -1, -1, -1, -1,
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/* hole */
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-1, -1, -1, -1, -1, -1, -1, -1,
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PT_AR_RSC,
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PT_AR_BSP,
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PT_AR_BSPSTORE,
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PT_AR_RNAT,
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-1,
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-1, /* Not available: FCR, IA32 floating control register */
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-1, -1,
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-1, /* Not available: EFLAG */
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-1, /* Not available: CSD */
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-1, /* Not available: SSD */
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-1, /* Not available: CFLG */
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-1, /* Not available: FSR */
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-1, /* Not available: FIR */
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-1, /* Not available: FDR */
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-1,
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PT_AR_CCV,
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-1, -1, -1,
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PT_AR_UNAT,
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-1, -1, -1,
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PT_AR_FPSR,
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-1, -1, -1,
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-1, /* Not available: ITC */
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1,
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PT_AR_PFS,
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PT_AR_LC,
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-1, /* Not available: EC, the Epilog Count register */
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1,
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/* nat bits - not fetched directly; instead we obtain these bits from
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either rnat or unat or from memory. */
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-1, -1, -1, -1, -1, -1, -1, -1,
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||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
};
|
||
|
||
int
|
||
ia64_register_u_addr (int blockend, int regnum)
|
||
{
|
||
int addr;
|
||
|
||
if (regnum < 0 || regnum >= NUM_REGS)
|
||
error ("Invalid register number %d.", regnum);
|
||
|
||
addr = u_offsets[regnum];
|
||
if (addr == -1)
|
||
addr = 0;
|
||
|
||
return addr;
|
||
}
|
||
|
||
static void
|
||
initialize_arch (void)
|
||
{
|
||
return;
|
||
}
|
||
|
||
#elif defined(ARM_GNULINUX_TARGET)
|
||
int arm_register_u_addr(blockend, regnum)
|
||
int blockend;
|
||
int regnum;
|
||
{
|
||
return blockend + REGISTER_BYTE(regnum);
|
||
}
|
||
|
||
static void
|
||
initialize_arch ()
|
||
{
|
||
}
|
||
#endif
|
||
|
||
CORE_ADDR
|
||
register_addr (int regno, CORE_ADDR blockend)
|
||
{
|
||
CORE_ADDR addr;
|
||
|
||
if (regno < 0 || regno >= NUM_REGS)
|
||
error ("Invalid register number %d.", regno);
|
||
|
||
REGISTER_U_ADDR (addr, blockend, regno);
|
||
|
||
return addr;
|
||
}
|
||
|
||
/* Fetch one register. */
|
||
|
||
static void
|
||
fetch_register (int regno)
|
||
{
|
||
CORE_ADDR regaddr;
|
||
register int i;
|
||
|
||
/* Offset of registers within the u area. */
|
||
unsigned int offset;
|
||
|
||
offset = U_REGS_OFFSET;
|
||
|
||
regaddr = register_addr (regno, offset);
|
||
for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
|
||
{
|
||
errno = 0;
|
||
*(PTRACE_XFER_TYPE *) ®isters[REGISTER_BYTE (regno) + i] =
|
||
ptrace (PTRACE_PEEKUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 0);
|
||
regaddr += sizeof (PTRACE_XFER_TYPE);
|
||
if (errno != 0)
|
||
{
|
||
/* Warning, not error, in case we are attached; sometimes the
|
||
kernel doesn't let us at the registers. */
|
||
char *err = strerror (errno);
|
||
char *msg = alloca (strlen (err) + 128);
|
||
sprintf (msg, "reading register %d: %s", regno, err);
|
||
error (msg);
|
||
goto error_exit;
|
||
}
|
||
}
|
||
error_exit:;
|
||
}
|
||
|
||
/* Fetch all registers, or just one, from the child process. */
|
||
|
||
void
|
||
fetch_inferior_registers (int regno)
|
||
{
|
||
if (regno == -1 || regno == 0)
|
||
for (regno = 0; regno < NUM_REGS - NUM_FREGS; regno++)
|
||
fetch_register (regno);
|
||
else
|
||
fetch_register (regno);
|
||
}
|
||
|
||
/* Store our register values back into the inferior.
|
||
If REGNO is -1, do this for all registers.
|
||
Otherwise, REGNO specifies which register (so we can save time). */
|
||
|
||
void
|
||
store_inferior_registers (int regno)
|
||
{
|
||
CORE_ADDR regaddr;
|
||
int i;
|
||
unsigned int offset = U_REGS_OFFSET;
|
||
|
||
if (regno >= 0)
|
||
{
|
||
#if 0
|
||
if (CANNOT_STORE_REGISTER (regno))
|
||
return;
|
||
#endif
|
||
regaddr = register_addr (regno, offset);
|
||
errno = 0;
|
||
#if 0
|
||
if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM)
|
||
{
|
||
scratch = *(int *) ®isters[REGISTER_BYTE (regno)] | 0x3;
|
||
ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
|
||
scratch, 0);
|
||
if (errno != 0)
|
||
{
|
||
/* Error, even if attached. Failing to write these two
|
||
registers is pretty serious. */
|
||
sprintf (buf, "writing register number %d", regno);
|
||
perror_with_name (buf);
|
||
}
|
||
}
|
||
else
|
||
#endif
|
||
for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
|
||
{
|
||
errno = 0;
|
||
ptrace (PTRACE_POKEUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
|
||
*(int *) ®isters[REGISTER_BYTE (regno) + i]);
|
||
if (errno != 0)
|
||
{
|
||
/* Warning, not error, in case we are attached; sometimes the
|
||
kernel doesn't let us at the registers. */
|
||
char *err = strerror (errno);
|
||
char *msg = alloca (strlen (err) + 128);
|
||
sprintf (msg, "writing register %d: %s",
|
||
regno, err);
|
||
error (msg);
|
||
return;
|
||
}
|
||
regaddr += sizeof (int);
|
||
}
|
||
}
|
||
else
|
||
for (regno = 0; regno < NUM_REGS - NUM_FREGS; regno++)
|
||
store_inferior_registers (regno);
|
||
}
|
||
|
||
/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
|
||
in the NEW_SUN_PTRACE case.
|
||
It ought to be straightforward. But it appears that writing did
|
||
not write the data that I specified. I cannot understand where
|
||
it got the data that it actually did write. */
|
||
|
||
/* Copy LEN bytes from inferior's memory starting at MEMADDR
|
||
to debugger memory starting at MYADDR. */
|
||
|
||
void
|
||
read_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len)
|
||
{
|
||
register int i;
|
||
/* Round starting address down to longword boundary. */
|
||
register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
|
||
/* Round ending address up; get number of longwords that makes. */
|
||
register int count
|
||
= (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
|
||
/ sizeof (PTRACE_XFER_TYPE);
|
||
/* Allocate buffer of that many longwords. */
|
||
register PTRACE_XFER_TYPE *buffer
|
||
= (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
|
||
|
||
/* Read all the longwords */
|
||
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
|
||
{
|
||
buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, 0);
|
||
}
|
||
|
||
/* Copy appropriate bytes out of the buffer. */
|
||
memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), len);
|
||
}
|
||
|
||
/* Copy LEN bytes of data from debugger memory at MYADDR
|
||
to inferior's memory at MEMADDR.
|
||
On failure (cannot write the inferior)
|
||
returns the value of errno. */
|
||
|
||
int
|
||
write_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len)
|
||
{
|
||
register int i;
|
||
/* Round starting address down to longword boundary. */
|
||
register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
|
||
/* Round ending address up; get number of longwords that makes. */
|
||
register int count
|
||
= (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE);
|
||
/* Allocate buffer of that many longwords. */
|
||
register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
|
||
extern int errno;
|
||
|
||
/* Fill start and end extra bytes of buffer with existing memory data. */
|
||
|
||
buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) addr, 0);
|
||
|
||
if (count > 1)
|
||
{
|
||
buffer[count - 1]
|
||
= ptrace (PTRACE_PEEKTEXT, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) (addr + (count - 1)
|
||
* sizeof (PTRACE_XFER_TYPE)),
|
||
0);
|
||
}
|
||
|
||
/* Copy data to be written over corresponding part of buffer */
|
||
|
||
memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len);
|
||
|
||
/* Write the entire buffer. */
|
||
|
||
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
|
||
{
|
||
errno = 0;
|
||
ptrace (PTRACE_POKETEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i]);
|
||
if (errno)
|
||
return errno;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
void
|
||
initialize_low (void)
|
||
{
|
||
initialize_arch ();
|
||
}
|