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authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
commitc906108c21474dfb4ed285bcc0ac6fe02cd400cc (patch)
treea0015aa5cedc19ccbab307251353a41722a3ae13 /gdb/infptrace.c
parentcd946cff9ede3f30935803403f06f6ed30cad136 (diff)
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Initial creation of sourceware repositorygdb-4_18-branchpoint
Diffstat (limited to 'gdb/infptrace.c')
-rw-r--r--gdb/infptrace.c638
1 files changed, 638 insertions, 0 deletions
diff --git a/gdb/infptrace.c b/gdb/infptrace.c
new file mode 100644
index 0000000..1db7223
--- /dev/null
+++ b/gdb/infptrace.c
@@ -0,0 +1,638 @@
+/* Low level Unix child interface to ptrace, for GDB when running under Unix.
+ Copyright 1988, 89, 90, 91, 92, 93, 94, 95, 96, 1998
+ 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 "wait.h"
+#include "command.h"
+
+#ifdef USG
+#include <sys/types.h>
+#endif
+
+#include <sys/param.h>
+#include <sys/dir.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 PARAMS ((char *, int));
+#endif
+
+#if !defined (FETCH_INFERIOR_REGISTERS)
+static void fetch_register PARAMS ((int));
+static void store_register PARAMS ((int));
+#endif
+
+void _initialize_kernel_u_addr PARAMS ((void));
+void _initialize_infptrace PARAMS ((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 (request, pid, addr, data)
+ int request, 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;
+ pt_status = ptrace (PT_SETTRC, pid, addr, data
+#if defined (FIVE_ARG_PTRACE)
+ /* Deal with HPUX 8.0 braindamage. We never use the
+ calls which require the fifth argument. */
+ , 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
+ pt_status = ptrace (request, pid, addr, data
+#if defined (FIVE_ARG_PTRACE)
+ /* Deal with HPUX 8.0 braindamage. We never use the
+ calls which require the fifth argument. */
+ , 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 (pid, status)
+ int pid;
+ int *status;
+{
+ int wstate;
+
+ wstate = wait (status);
+ target_post_wait (wstate, *status);
+ return wstate;
+}
+
+void
+kill_inferior ()
+{
+ int status;
+
+ if (inferior_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, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0);
+ ptrace_wait (0, &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 (pid, step, signal)
+ int pid;
+ int step;
+ enum target_signal signal;
+{
+ 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_pid" are the same. */
+ pid = inferior_pid;
+
+ /* 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)
+ abort(); /* 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 (pid)
+ 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 (signal)
+ int signal;
+{
+ errno = 0;
+ ptrace (PT_DETACH, inferior_pid, (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 ()
+{
+#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
+ fatal ("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, inferior_pid, \
+ (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
+ - KERNEL_U_ADDR
+#endif
+
+/* Registers we shouldn't try to fetch. */
+#if !defined (CANNOT_FETCH_REGISTER)
+#define CANNOT_FETCH_REGISTER(regno) 0
+#endif
+
+/* Fetch one register. */
+
+static void
+fetch_register (regno)
+ 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[MAX_REGISTER_RAW_SIZE];
+
+ if (CANNOT_FETCH_REGISTER (regno))
+ {
+ memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */
+ supply_register (regno, buf);
+ return;
+ }
+
+ 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, inferior_pid,
+ (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 (regno)
+ int regno;
+{
+ if (regno >= 0)
+ {
+ fetch_register (regno);
+ }
+ else
+ {
+ for (regno = 0; regno < ARCH_NUM_REGS; regno++)
+ {
+ fetch_register (regno);
+ }
+ }
+}
+
+/* Registers we shouldn't try to store. */
+#if !defined (CANNOT_STORE_REGISTER)
+#define CANNOT_STORE_REGISTER(regno) 0
+#endif
+
+/* Store one register. */
+
+static void
+store_register (regno)
+ 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. */
+
+ if (CANNOT_STORE_REGISTER (regno))
+ {
+ return;
+ }
+
+ 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 (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
+ *(PTRACE_XFER_TYPE *) &registers[REGISTER_BYTE (regno) + 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 (regno)
+ int regno;
+{
+ if (regno >= 0)
+ {
+ store_register (regno);
+ }
+ else
+ {
+ for (regno = 0; regno < ARCH_NUM_REGS; regno++)
+ {
+ store_register (regno);
+ }
+ }
+}
+#endif /* !defined (FETCH_INFERIOR_REGISTERS). */
+
+
+#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.
+
+ 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 (memaddr, myaddr, len, write, target)
+ CORE_ADDR memaddr;
+ char *myaddr;
+ int len;
+ int write;
+ struct target_ops *target; /* ignored */
+{
+ register int i;
+ /* Round starting address down to longword boundary. */
+ register CORE_ADDR addr = memaddr & - sizeof (PTRACE_XFER_TYPE);
+ /* Round ending address up; get number of longwords that makes. */
+ register int count
+ = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
+ / sizeof (PTRACE_XFER_TYPE);
+ /* Allocate buffer of that many longwords. */
+ register PTRACE_XFER_TYPE *buffer
+ = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
+
+ 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, inferior_pid, (PTRACE_ARG3_TYPE) addr,
+ 0);
+ }
+
+ if (count > 1) /* FIXME, avoid if even boundary */
+ {
+ buffer[count - 1]
+ = ptrace (PT_READ_I, inferior_pid,
+ ((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, inferior_pid, (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, inferior_pid, (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, inferior_pid,
+ (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);
+ }
+ return len;
+}
+
+
+static void
+udot_info (dummy1, dummy2)
+ 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, inferior_pid, (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 ()
+{
+#if !defined (CHILD_XFER_MEMORY)
+ add_info ("udot", udot_info,
+ "Print contents of kernel ``struct user'' for current child.");
+#endif
+}