292 lines
7.7 KiB
C
292 lines
7.7 KiB
C
/* Low level interface to ptrace, for the remote server for GDB.
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Copyright 1986, 1987, 1993, 1994, 1995, 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 "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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#include <sys/user.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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/***************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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#include <sys/ptrace.h>
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#include <machine/reg.h>
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extern int sys_nerr;
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extern char **sys_errlist;
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extern int errno;
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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);
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execv (program, allargs);
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fprintf (stderr, "Cannot exec %s: %s.\n", 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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/* Attaching is not supported. */
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int
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myattach (int pid)
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{
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return -1;
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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 (8, inferior_pid, 0, 0);
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wait (0);
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/*************inferior_died ();****VK**************/
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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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pid = wait (&w);
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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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/* 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 (int ignored)
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{
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struct regs inferior_registers;
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struct fp_status inferior_fp_registers;
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ptrace (PTRACE_GETREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) & inferior_registers);
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#ifdef FP0_REGNUM
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ptrace (PTRACE_GETFPREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) & inferior_fp_registers);
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#endif
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memcpy (registers, &inferior_registers, 16 * 4);
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#ifdef FP0_REGNUM
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memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
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sizeof inferior_fp_registers.fps_regs);
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#endif
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*(int *) ®isters[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
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*(int *) ®isters[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
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#ifdef FP0_REGNUM
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memcpy
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(®isters[REGISTER_BYTE (FPC_REGNUM)],
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&inferior_fp_registers.fps_control,
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sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs);
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#endif
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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 (int ignored)
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{
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struct regs inferior_registers;
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struct fp_status inferior_fp_registers;
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memcpy (&inferior_registers, registers, 16 * 4);
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#ifdef FP0_REGNUM
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memcpy (&inferior_fp_registers,
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®isters[REGISTER_BYTE (FP0_REGNUM)],
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sizeof inferior_fp_registers.fps_regs);
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#endif
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inferior_registers.r_ps = *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)];
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inferior_registers.r_pc = *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)];
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#ifdef FP0_REGNUM
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memcpy (&inferior_fp_registers.fps_control,
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®isters[REGISTER_BYTE (FPC_REGNUM)],
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(sizeof inferior_fp_registers
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- sizeof inferior_fp_registers.fps_regs));
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#endif
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ptrace (PTRACE_SETREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) & inferior_registers);
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#if FP0_REGNUM
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ptrace (PTRACE_SETFPREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) & inferior_fp_registers);
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#endif
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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 (CORE_ADDR memaddr, char *myaddr, 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 & -(CORE_ADDR) 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 (1, 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 (CORE_ADDR memaddr, char *myaddr, 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 & -(CORE_ADDR) 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 (1, 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 (1, 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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errno = 0;
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ptrace (4, inferior_pid, addr, buffer[i]);
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if (errno)
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return errno;
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}
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return 0;
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}
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void
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initialize_low (void)
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{
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}
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