home *** CD-ROM | disk | FTP | other *** search
- /* 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 <sys/wait.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>
- #include <signal.h>
- #include <sys/ioctl.h>
- #include <sgtty.h>
- #include <fcntl.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 int sys_nerr;
- extern char **sys_errlist;
- 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 (program, allargs)
- char *program;
- char **allargs;
- {
- int pid;
-
- pid = fork ();
- if (pid < 0)
- perror_with_name ("fork");
-
- if (pid == 0)
- {
- ptrace (PTRACE_TRACEME);
-
- execv (program, allargs);
-
- fprintf (stderr, "Cannot exec %s: %s.\n", program,
- 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 != inferior_pid)
- perror_with_name ("wait");
-
- if (WIFEXITED (w))
- {
- fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
- *status = 'W';
- return ((unsigned char) WEXITSTATUS (w));
- }
- else if (!WIFSTOPPED (w))
- {
- fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
- *status = 'X';
- return ((unsigned char) WTERMSIG (w));
- }
-
- fetch_inferior_registers (0);
-
- *status = 'T';
- 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");
- }
-
- /* 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;
- {
- struct regs inferior_registers;
- struct fp_status inferior_fp_registers;
- int i;
-
- /* Global and Out regs are fetched directly, as well as the control
- registers. If we're getting one of the in or local regs,
- and the stack pointer has not yet been fetched,
- we have to do that first, since they're found in memory relative
- to the stack pointer. */
-
- if (ptrace (PTRACE_GETREGS, inferior_pid,
- (PTRACE_ARG3_TYPE) &inferior_registers, 0))
- perror("ptrace_getregs");
-
- registers[REGISTER_BYTE (0)] = 0;
- memcpy (®isters[REGISTER_BYTE (1)], &inferior_registers.r_g1,
- 15 * REGISTER_RAW_SIZE (G0_REGNUM));
- *(int *)®isters[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
- *(int *)®isters[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
- *(int *)®isters[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
- *(int *)®isters[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
-
- /* Floating point registers */
-
- if (ptrace (PTRACE_GETFPREGS, inferior_pid,
- (PTRACE_ARG3_TYPE) &inferior_fp_registers,
- 0))
- perror("ptrace_getfpregs");
- memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
- sizeof inferior_fp_registers.fpu_fr);
-
- /* These regs are saved on the stack by the kernel. Only read them
- all (16 ptrace calls!) if we really need them. */
-
- read_inferior_memory (*(CORE_ADDR*)®isters[REGISTER_BYTE (SP_REGNUM)],
- ®isters[REGISTER_BYTE (L0_REGNUM)],
- 16*REGISTER_RAW_SIZE (L0_REGNUM));
- }
-
- /* 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;
- {
- struct regs inferior_registers;
- struct fp_status inferior_fp_registers;
- CORE_ADDR sp = *(CORE_ADDR *)®isters[REGISTER_BYTE (SP_REGNUM)];
-
- write_inferior_memory (sp, ®isters[REGISTER_BYTE (L0_REGNUM)],
- 16*REGISTER_RAW_SIZE (L0_REGNUM));
-
- memcpy (&inferior_registers.r_g1, ®isters[REGISTER_BYTE (G1_REGNUM)],
- 15 * REGISTER_RAW_SIZE (G1_REGNUM));
-
- inferior_registers.r_ps =
- *(int *)®isters[REGISTER_BYTE (PS_REGNUM)];
- inferior_registers.r_pc =
- *(int *)®isters[REGISTER_BYTE (PC_REGNUM)];
- inferior_registers.r_npc =
- *(int *)®isters[REGISTER_BYTE (NPC_REGNUM)];
- inferior_registers.r_y =
- *(int *)®isters[REGISTER_BYTE (Y_REGNUM)];
-
- if (ptrace (PTRACE_SETREGS, inferior_pid,
- (PTRACE_ARG3_TYPE) &inferior_registers, 0))
- perror("ptrace_setregs");
-
- memcpy (&inferior_fp_registers, ®isters[REGISTER_BYTE (FP0_REGNUM)],
- sizeof inferior_fp_registers.fpu_fr);
-
- if (ptrace (PTRACE_SETFPREGS, inferior_pid,
- (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0))
- perror("ptrace_setfpregs");
- }
-
- /* 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. */
- memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 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 (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;
- }
-