631 lines
15 KiB
C
631 lines
15 KiB
C
/* Low level interface to ptrace, for GDB when running under Unix.
|
||
Copyright (C) 1988 Free Software Foundation, Inc.
|
||
|
||
GDB is distributed in the hope that it will be useful, but WITHOUT ANY
|
||
WARRANTY. No author or distributor accepts responsibility to anyone
|
||
for the consequences of using it or for whether it serves any
|
||
particular purpose or works at all, unless he says so in writing.
|
||
Refer to the GDB General Public License for full details.
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||
|
||
Everyone is granted permission to copy, modify and redistribute GDB,
|
||
but only under the conditions described in the GDB General Public
|
||
License. A copy of this license is supposed to have been given to you
|
||
along with GDB so you can know your rights and responsibilities. It
|
||
should be in a file named COPYING. Among other things, the copyright
|
||
notice and this notice must be preserved on all copies.
|
||
|
||
In other words, go ahead and share GDB, but don't try to stop
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||
anyone else from sharing it farther. Help stamp out software hoarding!
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||
*/
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||
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#ifndef lint
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static char rcsid[] = "$Id: isi-dep.c,v 1.2 1993/08/02 17:39:50 mycroft Exp $";
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#endif /* not lint */
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#include <stdio.h>
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#include "defs.h"
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#include "param.h"
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#include "frame.h"
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#include "inferior.h"
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#ifdef USG
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#include <sys/types.h>
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#endif
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <signal.h>
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#include <sys/user.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#ifdef COFF_ENCAPSULATE
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#include "a.out.encap.h"
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#else
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#include <a.out.h>
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#endif
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#ifndef N_SET_MAGIC
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#define N_SET_MAGIC(exec, val) ((exec).a_magic = (val))
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#endif
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/ptrace.h>
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#ifdef ATTACH_DETACH
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static int oldParent;
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extern int attach_flag;
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#endif /* ATTACH_DETACH */
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/*
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* Mapping of register numbers to their position in the stack
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*/
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#include <machine/reg.h>
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int rloc[] = {
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R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, FP, SP, PS, PC
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};
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extern int errno;
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/* This function simply calls ptrace with the given arguments.
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It exists so that all calls to ptrace are isolated in this
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machine-dependent file. */
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int
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call_ptrace (request, pid, arg3, arg4)
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int request, pid, arg3, arg4;
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{
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return ptrace (request, pid, arg3, arg4);
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}
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#ifdef ATTACH_DETACH
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/* Start debugging the process whose number is PID. */
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attach (pid)
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int pid;
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{
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errno = 0;
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oldParent = ptrace (PT_ATTACH, pid, 0, 0);
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if (errno)
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perror_with_name ("ptrace");
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attach_flag = 1;
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return pid;
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}
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/* Stop debugging the process whose number is PID
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and continue it with signal number SIGNAL.
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SIGNAL = 0 means just continue it. */
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void
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detach (signal)
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int signal;
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{
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errno = 0;
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ptrace (PT_DETACH, inferior_pid, signal, oldParent);
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if (errno)
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perror_with_name ("ptrace");
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attach_flag = 0;
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}
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#endif /* ATTACH_DETACH */
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kill_inferior ()
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{
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if (remote_debugging)
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return;
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if (inferior_pid == 0)
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return;
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#ifdef ATTACH_DETACH
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if (attach_flag) {
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/*
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* Need to detach so the old parent gets notified of the death.
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*/
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detach(SIGKILL);
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} else {
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#endif /* ATTACH_DETACH */
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ptrace (PT_KILL, inferior_pid, 0, 0);
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wait (0);
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#ifdef ATTACH_DETACH
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}
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#endif /* ATTACH_DETACH */
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inferior_died ();
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}
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/* This is used when GDB is exiting. It gives less chance of error.*/
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kill_inferior_fast ()
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{
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if (remote_debugging)
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return;
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if (inferior_pid == 0)
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return;
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#ifdef ATTACH_DETACH
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if (attach_flag) {
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detach(SIGKILL);
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} else {
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#endif /* ATTACH_DETACH */
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ptrace (PT_KILL, inferior_pid, 0, 0);
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wait (0);
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#ifdef ATTACH_DETACH
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}
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#endif /* ATTACH_DETACH */
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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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resume (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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if (remote_debugging)
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remote_resume (step, signal);
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else
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{
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ptrace (step ? PT_STEP : PT_CONTINUE, 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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}
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void
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fetch_inferior_registers ()
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{
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register int regno;
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register unsigned int regaddr;
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char buf[MAX_REGISTER_RAW_SIZE];
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register int i;
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struct user u;
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unsigned int offset = (char *) &u.u_ar0 - (char *) &u;
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offset = ptrace (3, inferior_pid, offset, 0) - KERNEL_U_ADDR;
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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regaddr = register_addr (regno, offset);
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for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
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{
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*(int *) &buf[i] = ptrace (3, inferior_pid, regaddr, 0);
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regaddr += sizeof (int);
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}
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supply_register (regno, buf);
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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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store_inferior_registers (regno)
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int regno;
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{
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register unsigned int regaddr;
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char buf[80];
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struct user u;
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unsigned int offset = (char *) &u.u_ar0 - (char *) &u;
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offset = ptrace (3, inferior_pid, offset, 0) - KERNEL_U_ADDR;
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if (regno >= 0)
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{
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regaddr = register_addr (regno, offset);
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errno = 0;
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ptrace (6, inferior_pid, regaddr, read_register (regno));
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if (errno != 0)
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{
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sprintf (buf, "writing register number %d", regno);
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perror_with_name (buf);
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}
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}
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else for (regno = 0; regno < NUM_REGS; regno++)
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{
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regaddr = register_addr (regno, offset);
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errno = 0;
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ptrace (6, inferior_pid, regaddr, read_register (regno));
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if (errno != 0)
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{
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sprintf (buf, "writing register number %d", regno);
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perror_with_name (buf);
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}
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}
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}
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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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On failure (cannot read from inferior, usually because address is out
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of bounds) returns the value of errno. */
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int
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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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extern int errno;
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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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errno = 0;
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if (remote_debugging)
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buffer[i] = remote_fetch_word (addr);
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else
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buffer[i] = ptrace (1, inferior_pid, addr, 0);
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if (errno)
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return errno;
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}
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/* Copy appropriate bytes out of the buffer. */
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bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
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return 0;
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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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if (remote_debugging)
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buffer[0] = remote_fetch_word (addr);
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else
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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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if (remote_debugging)
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buffer[count - 1]
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= remote_fetch_word (addr + (count - 1) * sizeof (int));
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else
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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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bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), 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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if (remote_debugging)
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remote_store_word (addr, buffer[i]);
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else
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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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||
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||
return 0;
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||
}
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||
|
||
/* Work with core dump and executable files, for GDB.
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||
This code would be in core.c if it weren't machine-dependent. */
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||
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/* Recognize COFF format systems because a.out.h defines AOUTHDR. */
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#ifdef AOUTHDR
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#define COFF_FORMAT
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||
#endif
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||
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||
#ifndef N_TXTADDR
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#define N_TXTADDR(hdr) 0
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||
#endif /* no N_TXTADDR */
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||
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#ifndef N_DATADDR
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||
#define N_DATADDR(hdr) hdr.a_text
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||
#endif /* no N_DATADDR */
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||
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||
/* Make COFF and non-COFF names for things a little more compatible
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||
to reduce conditionals later. */
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||
|
||
#ifdef COFF_FORMAT
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||
#define a_magic magic
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#endif
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||
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||
#ifndef COFF_FORMAT
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#define AOUTHDR struct exec
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||
#endif
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||
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||
extern char *sys_siglist[];
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||
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||
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/* Hook for `exec_file_command' command to call. */
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||
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extern void (*exec_file_display_hook) ();
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/* File names of core file and executable file. */
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||
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extern char *corefile;
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extern char *execfile;
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/* Descriptors on which core file and executable file are open.
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||
Note that the execchan is closed when an inferior is created
|
||
and reopened if the inferior dies or is killed. */
|
||
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||
extern int corechan;
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extern int execchan;
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||
|
||
/* Last modification time of executable file.
|
||
Also used in source.c to compare against mtime of a source file. */
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||
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||
extern int exec_mtime;
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||
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||
/* Virtual addresses of bounds of the two areas of memory in the core file. */
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||
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extern CORE_ADDR data_start;
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||
extern CORE_ADDR data_end;
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||
extern CORE_ADDR stack_start;
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||
extern CORE_ADDR stack_end;
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||
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||
/* Virtual addresses of bounds of two areas of memory in the exec file.
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||
Note that the data area in the exec file is used only when there is no core file. */
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||
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extern CORE_ADDR text_start;
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||
extern CORE_ADDR text_end;
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||
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||
extern CORE_ADDR exec_data_start;
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||
extern CORE_ADDR exec_data_end;
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||
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||
/* Address in executable file of start of text area data. */
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||
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extern int text_offset;
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||
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||
/* Address in executable file of start of data area data. */
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||
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||
extern int exec_data_offset;
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||
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||
/* Address in core file of start of data area data. */
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||
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||
extern int data_offset;
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||
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||
/* Address in core file of start of stack area data. */
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||
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||
extern int stack_offset;
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||
|
||
#ifdef COFF_FORMAT
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||
/* various coff data structures */
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||
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||
extern FILHDR file_hdr;
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||
extern SCNHDR text_hdr;
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||
extern SCNHDR data_hdr;
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||
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||
#endif /* not COFF_FORMAT */
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||
|
||
/* a.out header saved in core file. */
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||
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||
extern AOUTHDR core_aouthdr;
|
||
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||
/* a.out header of exec file. */
|
||
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||
extern AOUTHDR exec_aouthdr;
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||
|
||
extern void validate_files ();
|
||
|
||
core_file_command (filename, from_tty)
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||
char *filename;
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||
int from_tty;
|
||
{
|
||
int val;
|
||
extern char registers[];
|
||
|
||
/* Discard all vestiges of any previous core file
|
||
and mark data and stack spaces as empty. */
|
||
|
||
if (corefile)
|
||
free (corefile);
|
||
corefile = 0;
|
||
|
||
if (corechan >= 0)
|
||
close (corechan);
|
||
corechan = -1;
|
||
|
||
data_start = 0;
|
||
data_end = 0;
|
||
stack_start = STACK_END_ADDR;
|
||
stack_end = STACK_END_ADDR;
|
||
|
||
/* Now, if a new core file was specified, open it and digest it. */
|
||
|
||
if (filename)
|
||
{
|
||
filename = tilde_expand (filename);
|
||
make_cleanup (free, filename);
|
||
|
||
if (have_inferior_p ())
|
||
error ("To look at a core file, you must kill the inferior with \"kill\".");
|
||
corechan = open (filename, O_RDONLY, 0);
|
||
if (corechan < 0)
|
||
perror_with_name (filename);
|
||
/* 4.2-style (and perhaps also sysV-style) core dump file. */
|
||
{
|
||
struct user u;
|
||
|
||
int reg_offset;
|
||
|
||
val = myread (corechan, &u, sizeof u);
|
||
if (val < 0)
|
||
perror_with_name (filename);
|
||
data_start = exec_data_start;
|
||
|
||
data_end = data_start + NBPG * u.u_dsize;
|
||
stack_start = stack_end - NBPG * u.u_ssize;
|
||
data_offset = NBPG * UPAGES;
|
||
stack_offset = NBPG * (UPAGES + u.u_dsize);
|
||
reg_offset = (int) u.u_ar0 - KERNEL_U_ADDR;
|
||
|
||
/* I don't know where to find this info.
|
||
So, for now, mark it as not available. */
|
||
N_SET_MAGIC (core_aouthdr, 0);
|
||
|
||
/* Read the register values out of the core file and store
|
||
them where `read_register' will find them. */
|
||
|
||
{
|
||
register int regno;
|
||
|
||
for (regno = 0; regno < NUM_REGS; regno++)
|
||
{
|
||
char buf[MAX_REGISTER_RAW_SIZE];
|
||
|
||
val = lseek (corechan, register_addr (regno, reg_offset), 0);
|
||
if (val < 0)
|
||
perror_with_name (filename);
|
||
|
||
val = myread (corechan, buf, sizeof buf);
|
||
if (val < 0)
|
||
perror_with_name (filename);
|
||
supply_register (regno, buf);
|
||
}
|
||
}
|
||
}
|
||
if (filename[0] == '/')
|
||
corefile = savestring (filename, strlen (filename));
|
||
else
|
||
{
|
||
corefile = concat (current_directory, "/", filename);
|
||
}
|
||
|
||
set_current_frame ( create_new_frame (read_register (FP_REGNUM),
|
||
read_pc ()));
|
||
select_frame (get_current_frame (), 0);
|
||
validate_files ();
|
||
}
|
||
else if (from_tty)
|
||
printf ("No core file now.\n");
|
||
}
|
||
|
||
exec_file_command (filename, from_tty)
|
||
char *filename;
|
||
int from_tty;
|
||
{
|
||
int val;
|
||
|
||
/* Eliminate all traces of old exec file.
|
||
Mark text segment as empty. */
|
||
|
||
if (execfile)
|
||
free (execfile);
|
||
execfile = 0;
|
||
data_start = 0;
|
||
data_end -= exec_data_start;
|
||
text_start = 0;
|
||
text_end = 0;
|
||
exec_data_start = 0;
|
||
exec_data_end = 0;
|
||
if (execchan >= 0)
|
||
close (execchan);
|
||
execchan = -1;
|
||
|
||
/* Now open and digest the file the user requested, if any. */
|
||
|
||
if (filename)
|
||
{
|
||
filename = tilde_expand (filename);
|
||
make_cleanup (free, filename);
|
||
|
||
execchan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
|
||
&execfile);
|
||
if (execchan < 0)
|
||
perror_with_name (filename);
|
||
|
||
#ifdef COFF_FORMAT
|
||
{
|
||
int aout_hdrsize;
|
||
int num_sections;
|
||
|
||
if (read_file_hdr (execchan, &file_hdr) < 0)
|
||
error ("\"%s\": not in executable format.", execfile);
|
||
|
||
aout_hdrsize = file_hdr.f_opthdr;
|
||
num_sections = file_hdr.f_nscns;
|
||
|
||
if (read_aout_hdr (execchan, &exec_aouthdr, aout_hdrsize) < 0)
|
||
error ("\"%s\": can't read optional aouthdr", execfile);
|
||
|
||
if (read_section_hdr (execchan, _TEXT, &text_hdr, num_sections,
|
||
aout_hdrsize) < 0)
|
||
error ("\"%s\": can't read text section header", execfile);
|
||
|
||
if (read_section_hdr (execchan, _DATA, &data_hdr, num_sections,
|
||
aout_hdrsize) < 0)
|
||
error ("\"%s\": can't read data section header", execfile);
|
||
|
||
text_start = exec_aouthdr.text_start;
|
||
text_end = text_start + exec_aouthdr.tsize;
|
||
text_offset = text_hdr.s_scnptr;
|
||
exec_data_start = exec_aouthdr.data_start;
|
||
exec_data_end = exec_data_start + exec_aouthdr.dsize;
|
||
exec_data_offset = data_hdr.s_scnptr;
|
||
data_start = exec_data_start;
|
||
data_end += exec_data_start;
|
||
exec_mtime = file_hdr.f_timdat;
|
||
}
|
||
#else /* not COFF_FORMAT */
|
||
{
|
||
struct stat st_exec;
|
||
|
||
#ifdef HEADER_SEEK_FD
|
||
HEADER_SEEK_FD (execchan);
|
||
#endif
|
||
|
||
val = myread (execchan, &exec_aouthdr, sizeof (AOUTHDR));
|
||
|
||
if (val < 0)
|
||
perror_with_name (filename);
|
||
|
||
text_start = N_TXTADDR (exec_aouthdr);
|
||
exec_data_start = N_DATADDR (exec_aouthdr);
|
||
|
||
text_offset = N_TXTOFF (exec_aouthdr);
|
||
exec_data_offset = N_TXTOFF (exec_aouthdr) + exec_aouthdr.a_text;
|
||
|
||
text_end = text_start + exec_aouthdr.a_text;
|
||
exec_data_end = exec_data_start + exec_aouthdr.a_data;
|
||
data_start = exec_data_start;
|
||
data_end += exec_data_start;
|
||
|
||
fstat (execchan, &st_exec);
|
||
exec_mtime = st_exec.st_mtime;
|
||
}
|
||
#endif /* not COFF_FORMAT */
|
||
|
||
validate_files ();
|
||
}
|
||
else if (from_tty)
|
||
printf ("No exec file now.\n");
|
||
|
||
/* Tell display code (if any) about the changed file name. */
|
||
if (exec_file_display_hook)
|
||
(*exec_file_display_hook) (filename);
|
||
}
|