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-rw-r--r--gdb/gdbserver/remote-inflow.c366
1 files changed, 366 insertions, 0 deletions
diff --git a/gdb/gdbserver/remote-inflow.c b/gdb/gdbserver/remote-inflow.c
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+++ b/gdb/gdbserver/remote-inflow.c
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+/* Low level interface to ptrace, for the remote server for GDB.
+ Copyright (C) 1986, 1987, 1993 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "defs.h"
+#include "frame.h"
+#include "inferior.h"
+/***************************
+#include "initialize.h"
+****************************/
+
+#include <stdio.h>
+#include <sys/param.h>
+#include <sys/dir.h>
+/*#include <sys/user.h>*/
+#define LYNXOS
+#include <sys/mem.h>
+#include <sys/signal.h>
+#include <sys/file.h>
+#include <sys/kernel.h>
+#include <sys/itimer.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/proc.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <sgtty.h>
+#include <fcntl.h>
+#include "/usr/include/wait.h"
+
+/***************Begin MY defs*********************/
+int quit_flag = 0;
+char registers[REGISTER_BYTES];
+
+/* Index within `registers' of the first byte of the space for
+ register N. */
+
+
+char buf2[MAX_REGISTER_RAW_SIZE];
+/***************End MY defs*********************/
+
+#include <sys/ptrace.h>
+/*#include <machine/reg.h>*/
+
+extern char **environ;
+extern int errno;
+extern int inferior_pid;
+void error (), quit (), perror_with_name ();
+int query ();
+
+/* Start an inferior process and returns its pid.
+ ALLARGS is a vector of program-name and args.
+ ENV is the environment vector to pass. */
+
+int
+create_inferior (allargs, env)
+ char **allargs;
+ char **env;
+{
+ int pid;
+ extern int sys_nerr;
+ extern char *sys_errlist[];
+ extern int errno;
+ char status;
+ char execbuf[1024];
+
+ /* exec is said to fail if the executable is open. */
+ /****************close_exec_file ();*****************/
+
+ sprintf (execbuf, "exec %s", allargs);
+
+ pid = fork ();
+ if (pid < 0)
+ perror_with_name ("fork");
+
+ if (pid == 0)
+ {
+ /* Run inferior in a separate process group. */
+ setpgrp (getpid (), getpid ());
+
+ errno = 0;
+ ptrace (PTRACE_TRACEME);
+
+ execle ("/bin/sh", "sh", "-c", execbuf, 0, env);
+
+ fprintf (stderr, "Cannot exec /bin/sh: %s.\n",
+ errno < sys_nerr ? sys_errlist[errno] : "unknown error");
+ fflush (stderr);
+ _exit (0177);
+ }
+
+ return pid;
+}
+
+/* Kill the inferior process. Make us have no inferior. */
+
+void
+kill_inferior ()
+{
+ if (inferior_pid == 0)
+ return;
+ ptrace (8, inferior_pid, 0, 0);
+ wait (0);
+ /*************inferior_died ();****VK**************/
+}
+
+/* Wait for process, returns status */
+
+unsigned char
+mywait (status)
+ char *status;
+{
+ int pid;
+ union wait w;
+
+ pid = wait (&w);
+ if (pid != PIDGET(inferior_pid))
+ perror_with_name ("wait");
+
+ inferior_pid = BUILDPID (inferior_pid, w.w_tid);
+
+ if (WIFEXITED (w))
+ {
+ fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
+ *status = 'E';
+ return ((unsigned char) WEXITSTATUS (w));
+ }
+ else if (!WIFSTOPPED (w))
+ {
+ fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
+ *status = 'T';
+ return ((unsigned char) WTERMSIG (w));
+ }
+
+ fetch_inferior_registers (0);
+
+ *status = 'S';
+ return ((unsigned char) WSTOPSIG (w));
+}
+
+/* Resume execution of the inferior process.
+ If STEP is nonzero, single-step it.
+ If SIGNAL is nonzero, give it that signal. */
+
+void
+myresume (step, signal)
+ int step;
+ int signal;
+{
+ errno = 0;
+ ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal);
+ if (errno)
+ perror_with_name ("ptrace");
+}
+
+#undef offsetof
+#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
+
+static struct econtext *
+lynx_registers_addr()
+{
+ st_t *stblock;
+ int ecpoff = offsetof(st_t, ecp);
+ CORE_ADDR ecp;
+
+ errno = 0;
+ stblock = (st_t *) ptrace (PTRACE_THREADUSER, inferior_pid,
+ (PTRACE_ARG3_TYPE)0, 0);
+ if (errno)
+ perror_with_name ("PTRACE_THREADUSER");
+
+ ecp = (CORE_ADDR) ptrace (PTRACE_PEEKTHREAD, inferior_pid,
+ (PTRACE_ARG3_TYPE)ecpoff, 0);
+ ecp -= (CORE_ADDR)stblock;
+ if (errno)
+ perror_with_name ("lynx_registers_addr(PTRACE_PEEKTHREAD)");
+
+ return (struct econtext *)ecp;
+}
+
+static struct econtext *ecp;
+
+/* Mapping between GDB register #s and offsets into econtext. Must be
+ consistent with REGISTER_NAMES macro in tm-i386v.h. */
+
+#define X(ENTRY)(offsetof(struct econtext, ENTRY) / 4)
+static int regmap[] = {
+ X(eax),
+ X(ecx),
+ X(edx),
+ X(ebx),
+ X(esp),
+ X(ebp),
+ X(esi),
+ X(edi),
+ X(eip),
+ X(flags), /* ps */
+ X(cs),
+ X(ss),
+ X(ds),
+ X(es),
+ X(ecode), /* Lynx doesn't give us either fs or gs, so */
+ X(fault) /* we just substitute these two in the hopes
+ that they are useful. */
+ };
+
+/* Fetch one or more registers from the inferior. REGNO == -1 to get
+ them all. We actually fetch more than requested, when convenient,
+ marking them as valid so we won't fetch them again. */
+
+void
+fetch_inferior_registers (ignored)
+ int ignored;
+{
+ int regno;
+ unsigned long reg;
+ struct econtext *ecp;
+
+ ecp = lynx_registers_addr();
+
+ for (regno = 0; regno < NUM_REGS; regno++)
+ {
+ errno = 0;
+ reg = ptrace (PTRACE_PEEKTHREAD, inferior_pid,
+ (PTRACE_ARG3_TYPE) (&ecp->fault + regmap[regno]), 0);
+ if (errno)
+ perror_with_name ("fetch_inferior_registers(PTRACE_PEEKTHREAD)");
+
+ *(unsigned long *)&registers[REGISTER_BYTE (regno)] = reg;
+ }
+}
+
+/* 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 (ignored)
+ int ignored;
+{
+ int regno;
+ unsigned long reg;
+ struct econtext *ecp;
+
+ ecp = lynx_registers_addr();
+
+ for (regno = 0; regno < NUM_REGS; regno++)
+ {
+ reg = *(unsigned long *)&registers[REGISTER_BYTE (regno)];
+
+ errno = 0;
+ ptrace (PTRACE_POKEUSER, inferior_pid,
+ (PTRACE_ARG3_TYPE) (&ecp->fault + regmap[regno]), reg);
+ if (errno)
+ perror_with_name ("PTRACE_POKEUSER");
+ }
+}
+
+/* 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. */
+
+read_inferior_memory (memaddr, myaddr, len)
+ CORE_ADDR memaddr;
+ char *myaddr;
+ int len;
+{
+ register int i;
+ /* Round starting address down to longword boundary. */
+ register CORE_ADDR addr = memaddr & -sizeof (int);
+ /* Round ending address up; get number of longwords that makes. */
+ register int count
+ = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
+ /* Allocate buffer of that many longwords. */
+ register int *buffer = (int *) alloca (count * sizeof (int));
+
+ /* Read all the longwords */
+ for (i = 0; i < count; i++, addr += sizeof (int))
+ {
+ buffer[i] = ptrace (1, inferior_pid, addr, 0);
+ }
+
+ /* Copy appropriate bytes out of the buffer. */
+ bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, 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 (memaddr, myaddr, len)
+ CORE_ADDR memaddr;
+ char *myaddr;
+ int len;
+{
+ register int i;
+ /* Round starting address down to longword boundary. */
+ register CORE_ADDR addr = memaddr & -sizeof (int);
+ /* Round ending address up; get number of longwords that makes. */
+ register int count
+ = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
+ /* Allocate buffer of that many longwords. */
+ register int *buffer = (int *) alloca (count * sizeof (int));
+ extern int errno;
+
+ /* Fill start and end extra bytes of buffer with existing memory data. */
+
+ buffer[0] = ptrace (1, inferior_pid, addr, 0);
+
+ if (count > 1)
+ {
+ buffer[count - 1]
+ = ptrace (1, inferior_pid,
+ addr + (count - 1) * sizeof (int), 0);
+ }
+
+ /* Copy data to be written over corresponding part of buffer */
+
+ bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
+
+ /* Write the entire buffer. */
+
+ for (i = 0; i < count; i++, addr += sizeof (int))
+ {
+ errno = 0;
+ ptrace (4, inferior_pid, addr, buffer[i]);
+ if (errno)
+ return errno;
+ }
+
+ return 0;
+}
+
+void
+initialize ()
+{
+ inferior_pid = 0;
+}
+
+int
+have_inferior_p ()
+{
+ return inferior_pid != 0;
+}
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