diff options
Diffstat (limited to 'gdb/infptrace.c')
| -rw-r--r-- | gdb/infptrace.c | 654 |
1 files changed, 0 insertions, 654 deletions
diff --git a/gdb/infptrace.c b/gdb/infptrace.c deleted file mode 100644 index 777a5b491ed..00000000000 --- a/gdb/infptrace.c +++ /dev/null @@ -1,654 +0,0 @@ -/* Low level Unix child interface to ptrace, for GDB when running under Unix. - Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, - 1998, 1999, 2000, 2001, 2002 - 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., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#include "defs.h" -#include "frame.h" -#include "inferior.h" -#include "target.h" -#include "gdb_string.h" -#include "regcache.h" - -#include "gdb_wait.h" - -#include "command.h" - -#ifdef USG -#include <sys/types.h> -#endif - -#include <sys/param.h> -#include "gdb_dirent.h" -#include <signal.h> -#include <sys/ioctl.h> - -#ifdef HAVE_PTRACE_H -#include <ptrace.h> -#else -#ifdef HAVE_SYS_PTRACE_H -#include <sys/ptrace.h> -#endif -#endif - -#if !defined (PT_READ_I) -#define PT_READ_I 1 /* Read word from text space */ -#endif -#if !defined (PT_READ_D) -#define PT_READ_D 2 /* Read word from data space */ -#endif -#if !defined (PT_READ_U) -#define PT_READ_U 3 /* Read word from kernel user struct */ -#endif -#if !defined (PT_WRITE_I) -#define PT_WRITE_I 4 /* Write word to text space */ -#endif -#if !defined (PT_WRITE_D) -#define PT_WRITE_D 5 /* Write word to data space */ -#endif -#if !defined (PT_WRITE_U) -#define PT_WRITE_U 6 /* Write word to kernel user struct */ -#endif -#if !defined (PT_CONTINUE) -#define PT_CONTINUE 7 /* Continue after signal */ -#endif -#if !defined (PT_STEP) -#define PT_STEP 9 /* Set flag for single stepping */ -#endif -#if !defined (PT_KILL) -#define PT_KILL 8 /* Send child a SIGKILL signal */ -#endif - -#ifndef PT_ATTACH -#define PT_ATTACH PTRACE_ATTACH -#endif -#ifndef PT_DETACH -#define PT_DETACH PTRACE_DETACH -#endif - -#include "gdbcore.h" -#ifndef NO_SYS_FILE -#include <sys/file.h> -#endif -#if 0 -/* Don't think this is used anymore. On the sequent (not sure whether it's - dynix or ptx or both), it is included unconditionally by sys/user.h and - not protected against multiple inclusion. */ -#include "gdb_stat.h" -#endif - -#if !defined (FETCH_INFERIOR_REGISTERS) -#include <sys/user.h> /* Probably need to poke the user structure */ -#if defined (KERNEL_U_ADDR_BSD) -#include <a.out.h> /* For struct nlist */ -#endif /* KERNEL_U_ADDR_BSD. */ -#endif /* !FETCH_INFERIOR_REGISTERS */ - -#if !defined (CHILD_XFER_MEMORY) -static void udot_info (char *, int); -#endif - -#if !defined (FETCH_INFERIOR_REGISTERS) -static void fetch_register (int); -static void store_register (int); -#endif - -void _initialize_kernel_u_addr (void); -void _initialize_infptrace (void); - - -/* This function simply calls ptrace with the given arguments. - It exists so that all calls to ptrace are isolated in this - machine-dependent file. */ -int -call_ptrace (int request, int pid, PTRACE_ARG3_TYPE addr, int data) -{ - int pt_status = 0; - -#if 0 - int saved_errno; - - printf ("call_ptrace(request=%d, pid=%d, addr=0x%x, data=0x%x)", - request, pid, addr, data); -#endif -#if defined(PT_SETTRC) - /* If the parent can be told to attach to us, try to do it. */ - if (request == PT_SETTRC) - { - errno = 0; -#if !defined (FIVE_ARG_PTRACE) - pt_status = ptrace (PT_SETTRC, pid, addr, data); -#else - /* Deal with HPUX 8.0 braindamage. We never use the - calls which require the fifth argument. */ - pt_status = ptrace (PT_SETTRC, pid, addr, data, 0); -#endif - if (errno) - perror_with_name ("ptrace"); -#if 0 - printf (" = %d\n", pt_status); -#endif - if (pt_status < 0) - return pt_status; - else - return parent_attach_all (pid, addr, data); - } -#endif - -#if defined(PT_CONTIN1) - /* On HPUX, PT_CONTIN1 is a form of continue that preserves pending - signals. If it's available, use it. */ - if (request == PT_CONTINUE) - request = PT_CONTIN1; -#endif - -#if defined(PT_SINGLE1) - /* On HPUX, PT_SINGLE1 is a form of step that preserves pending - signals. If it's available, use it. */ - if (request == PT_STEP) - request = PT_SINGLE1; -#endif - -#if 0 - saved_errno = errno; - errno = 0; -#endif -#if !defined (FIVE_ARG_PTRACE) - pt_status = ptrace (request, pid, addr, data); -#else - /* Deal with HPUX 8.0 braindamage. We never use the - calls which require the fifth argument. */ - pt_status = ptrace (request, pid, addr, data, 0); -#endif - -#if 0 - if (errno) - printf (" [errno = %d]", errno); - - errno = saved_errno; - printf (" = 0x%x\n", pt_status); -#endif - return pt_status; -} - - -#if defined (DEBUG_PTRACE) || defined (FIVE_ARG_PTRACE) -/* For the rest of the file, use an extra level of indirection */ -/* This lets us breakpoint usefully on call_ptrace. */ -#define ptrace call_ptrace -#endif - -/* Wait for a process to finish, possibly running a target-specific - hook before returning. */ - -int -ptrace_wait (ptid_t ptid, int *status) -{ - int wstate; - - wstate = wait (status); - target_post_wait (pid_to_ptid (wstate), *status); - return wstate; -} - -void -kill_inferior (void) -{ - int status; - int pid = PIDGET (inferior_ptid); - - if (pid == 0) - return; - - /* This once used to call "kill" to kill the inferior just in case - the inferior was still running. As others have noted in the past - (kingdon) there shouldn't be any way to get here if the inferior - is still running -- else there's a major problem elsewere in gdb - and it needs to be fixed. - - The kill call causes problems under hpux10, so it's been removed; - if this causes problems we'll deal with them as they arise. */ - ptrace (PT_KILL, pid, (PTRACE_ARG3_TYPE) 0, 0); - ptrace_wait (null_ptid, &status); - target_mourn_inferior (); -} - -#ifndef CHILD_RESUME - -/* Resume execution of the inferior process. - If STEP is nonzero, single-step it. - If SIGNAL is nonzero, give it that signal. */ - -void -child_resume (ptid_t ptid, int step, enum target_signal signal) -{ - int pid = PIDGET (ptid); - - errno = 0; - - if (pid == -1) - /* Resume all threads. */ - /* I think this only gets used in the non-threaded case, where "resume - all threads" and "resume inferior_ptid" are the same. */ - pid = PIDGET (inferior_ptid); - - /* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where - it was. (If GDB wanted it to start some other way, we have already - written a new PC value to the child.) - - If this system does not support PT_STEP, a higher level function will - have called single_step() to transmute the step request into a - continue request (by setting breakpoints on all possible successor - instructions), so we don't have to worry about that here. */ - - if (step) - { - if (SOFTWARE_SINGLE_STEP_P ()) - internal_error (__FILE__, __LINE__, "failed internal consistency check"); /* Make sure this doesn't happen. */ - else - ptrace (PT_STEP, pid, (PTRACE_ARG3_TYPE) 1, - target_signal_to_host (signal)); - } - else - ptrace (PT_CONTINUE, pid, (PTRACE_ARG3_TYPE) 1, - target_signal_to_host (signal)); - - if (errno) - { - perror_with_name ("ptrace"); - } -} -#endif /* CHILD_RESUME */ - - -#ifdef ATTACH_DETACH -/* Start debugging the process whose number is PID. */ -int -attach (int pid) -{ - errno = 0; - ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); - if (errno) - perror_with_name ("ptrace"); - attach_flag = 1; - return pid; -} - -/* Stop debugging the process whose number is PID - and continue it with signal number SIGNAL. - SIGNAL = 0 means just continue it. */ - -void -detach (int signal) -{ - errno = 0; - ptrace (PT_DETACH, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) 1, - signal); - if (errno) - perror_with_name ("ptrace"); - attach_flag = 0; -} -#endif /* ATTACH_DETACH */ - -/* Default the type of the ptrace transfer to int. */ -#ifndef PTRACE_XFER_TYPE -#define PTRACE_XFER_TYPE int -#endif - -/* KERNEL_U_ADDR is the amount to subtract from u.u_ar0 - to get the offset in the core file of the register values. */ -#if defined (KERNEL_U_ADDR_BSD) && !defined (FETCH_INFERIOR_REGISTERS) -/* Get kernel_u_addr using BSD-style nlist(). */ -CORE_ADDR kernel_u_addr; -#endif /* KERNEL_U_ADDR_BSD. */ - -void -_initialize_kernel_u_addr (void) -{ -#if defined (KERNEL_U_ADDR_BSD) && !defined (FETCH_INFERIOR_REGISTERS) - struct nlist names[2]; - - names[0].n_un.n_name = "_u"; - names[1].n_un.n_name = NULL; - if (nlist ("/vmunix", names) == 0) - kernel_u_addr = names[0].n_value; - else - internal_error (__FILE__, __LINE__, - "Unable to get kernel u area address."); -#endif /* KERNEL_U_ADDR_BSD. */ -} - -#if !defined (FETCH_INFERIOR_REGISTERS) - -#if !defined (offsetof) -#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) -#endif - -/* U_REGS_OFFSET is the offset of the registers within the u area. */ -#if !defined (U_REGS_OFFSET) -#define U_REGS_OFFSET \ - ptrace (PT_READ_U, PIDGET (inferior_ptid), \ - (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \ - - KERNEL_U_ADDR -#endif - -/* Fetch one register. */ - -static void -fetch_register (int regno) -{ - /* This isn't really an address. But ptrace thinks of it as one. */ - CORE_ADDR regaddr; - char mess[128]; /* For messages */ - register int i; - unsigned int offset; /* Offset of registers within the u area. */ - char *buf = alloca (MAX_REGISTER_RAW_SIZE); - int tid; - - if (CANNOT_FETCH_REGISTER (regno)) - { - memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */ - supply_register (regno, buf); - return; - } - - /* Overload thread id onto process id */ - if ((tid = TIDGET (inferior_ptid)) == 0) - tid = PIDGET (inferior_ptid); /* no thread id, just use process id */ - - 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 *) & buf[i] = ptrace (PT_READ_U, tid, - (PTRACE_ARG3_TYPE) regaddr, 0); - regaddr += sizeof (PTRACE_XFER_TYPE); - if (errno != 0) - { - sprintf (mess, "reading register %s (#%d)", - REGISTER_NAME (regno), regno); - perror_with_name (mess); - } - } - supply_register (regno, buf); -} - - -/* Fetch register values from the inferior. - If REGNO is negative, do this for all registers. - Otherwise, REGNO specifies which register (so we can save time). */ - -void -fetch_inferior_registers (int regno) -{ - if (regno >= 0) - { - fetch_register (regno); - } - else - { - for (regno = 0; regno < NUM_REGS; regno++) - { - fetch_register (regno); - } - } -} - -/* Store one register. */ - -static void -store_register (int regno) -{ - /* This isn't really an address. But ptrace thinks of it as one. */ - CORE_ADDR regaddr; - char mess[128]; /* For messages */ - register int i; - unsigned int offset; /* Offset of registers within the u area. */ - int tid; - char *buf = alloca (MAX_REGISTER_RAW_SIZE); - - if (CANNOT_STORE_REGISTER (regno)) - { - return; - } - - /* Overload thread id onto process id */ - if ((tid = TIDGET (inferior_ptid)) == 0) - tid = PIDGET (inferior_ptid); /* no thread id, just use process id */ - - offset = U_REGS_OFFSET; - - regaddr = register_addr (regno, offset); - - /* Put the contents of regno into a local buffer */ - regcache_collect (regno, buf); - - /* Store the local buffer into the inferior a chunk at the time. */ - for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) - { - errno = 0; - ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr, - *(PTRACE_XFER_TYPE *) (buf + i)); - regaddr += sizeof (PTRACE_XFER_TYPE); - if (errno != 0) - { - sprintf (mess, "writing register %s (#%d)", - REGISTER_NAME (regno), regno); - perror_with_name (mess); - } - } -} - -/* Store our register values back into the inferior. - If REGNO is negative, do this for all registers. - Otherwise, REGNO specifies which register (so we can save time). */ - -void -store_inferior_registers (int regno) -{ - if (regno >= 0) - { - store_register (regno); - } - else - { - for (regno = 0; regno < NUM_REGS; regno++) - { - store_register (regno); - } - } -} -#endif /* !defined (FETCH_INFERIOR_REGISTERS). */ - - -/* Set an upper limit on alloca. */ -#ifndef GDB_MAX_ALLOCA -#define GDB_MAX_ALLOCA 0x1000 -#endif - -#if !defined (CHILD_XFER_MEMORY) -/* 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 to or from inferior's memory starting at MEMADDR to - debugger memory starting at MYADDR. Copy to inferior if WRITE is - nonzero. TARGET is ignored. - - Returns the length copied, which is either the LEN argument or - zero. This xfer function does not do partial moves, since - child_ops doesn't allow memory operations to cross below us in the - target stack anyway. */ - -int -child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, - struct mem_attrib *attrib, struct target_ops *target) -{ - int i; - /* Round starting address down to longword boundary. */ - CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); - /* Round ending address up; get number of longwords that makes. */ - int count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) - / sizeof (PTRACE_XFER_TYPE)); - int alloc = count * sizeof (PTRACE_XFER_TYPE); - PTRACE_XFER_TYPE *buffer; - struct cleanup *old_chain = NULL; - - /* Allocate buffer of that many longwords. */ - if (len < GDB_MAX_ALLOCA) - { - buffer = (PTRACE_XFER_TYPE *) alloca (alloc); - } - else - { - buffer = (PTRACE_XFER_TYPE *) xmalloc (alloc); - old_chain = make_cleanup (xfree, buffer); - } - - if (write) - { - /* Fill start and end extra bytes of buffer with existing memory - data. */ - if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE)) - { - /* Need part of initial word -- fetch it. */ - buffer[0] = ptrace (PT_READ_I, PIDGET (inferior_ptid), - (PTRACE_ARG3_TYPE) addr, 0); - } - - if (count > 1) /* FIXME, avoid if even boundary. */ - { - buffer[count - 1] = - ptrace (PT_READ_I, PIDGET (inferior_ptid), - ((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 (PT_WRITE_D, PIDGET (inferior_ptid), - (PTRACE_ARG3_TYPE) addr, buffer[i]); - if (errno) - { - /* Using the appropriate one (I or D) is necessary for - Gould NP1, at least. */ - errno = 0; - ptrace (PT_WRITE_I, PIDGET (inferior_ptid), - (PTRACE_ARG3_TYPE) addr, buffer[i]); - } - if (errno) - return 0; - } -#ifdef CLEAR_INSN_CACHE - CLEAR_INSN_CACHE (); -#endif - } - else - { - /* Read all the longwords. */ - for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) - { - errno = 0; - buffer[i] = ptrace (PT_READ_I, PIDGET (inferior_ptid), - (PTRACE_ARG3_TYPE) addr, 0); - if (errno) - return 0; - QUIT; - } - - /* Copy appropriate bytes out of the buffer. */ - memcpy (myaddr, - (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), - len); - } - - if (old_chain != NULL) - do_cleanups (old_chain); - return len; -} - - -static void -udot_info (char *dummy1, int dummy2) -{ -#if defined (KERNEL_U_SIZE) - int udot_off; /* Offset into user struct */ - int udot_val; /* Value from user struct at udot_off */ - char mess[128]; /* For messages */ -#endif - - if (!target_has_execution) - { - error ("The program is not being run."); - } - -#if !defined (KERNEL_U_SIZE) - - /* Adding support for this command is easy. Typically you just add a - routine, called "kernel_u_size" that returns the size of the user - struct, to the appropriate *-nat.c file and then add to the native - config file "#define KERNEL_U_SIZE kernel_u_size()" */ - error ("Don't know how large ``struct user'' is in this version of gdb."); - -#else - - for (udot_off = 0; udot_off < KERNEL_U_SIZE; udot_off += sizeof (udot_val)) - { - if ((udot_off % 24) == 0) - { - if (udot_off > 0) - { - printf_filtered ("\n"); - } - printf_filtered ("%04x:", udot_off); - } - udot_val = ptrace (PT_READ_U, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) udot_off, 0); - if (errno != 0) - { - sprintf (mess, "\nreading user struct at offset 0x%x", udot_off); - perror_with_name (mess); - } - /* Avoid using nonportable (?) "*" in print specs */ - printf_filtered (sizeof (int) == 4 ? " 0x%08x" : " 0x%16x", udot_val); - } - printf_filtered ("\n"); - -#endif -} -#endif /* !defined (CHILD_XFER_MEMORY). */ - - -void -_initialize_infptrace (void) -{ -#if !defined (CHILD_XFER_MEMORY) - add_info ("udot", udot_info, - "Print contents of kernel ``struct user'' for current child."); -#endif -} |